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Noriyuki Tsuchida - One of the best experts on this subject based on the ideXlab platform.
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Enhanced true stress–true strain relationships due to Grain refinement of a low-carbon Ferrite–pearlite steel
Materials Letters, 2015Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu Inoue, T. OkamotoAbstract:Abstract The fine-Grained low-carbon Ferrite–pearlite (FP) steel with the Ferrite Grain size of 3.6 μm showed enhanced true stress (σ)–true strain (e) relationships up to fracture, i.e., the plastic deformation limit. Both σ and e increased with decreasing Ferrite Grain size in the FP steels. The effect of Ferrite Grain size on the σ–e relationships up to the plastic deformation limit was dependent on the microstructure, in spite of belonging to the same low-carbon steel. In the FP steels, the smaller the pearlite size became with decreasing Ferrite Grain size, the more the pearlite could deform. The decrease in not only the Ferrite Grain size but also the secondary microstructure is effective in improving the σ–e relationship up to the plastic deformation limit.
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effect of Ferrite Grain size on local elongation in a low carbon steel
8th Pacific Rim International Congress on Advanced Materials and Processing 2013 PRICM 8, 2013Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu InoueAbstract:Effect of Grain size on local elongation in low carbon steel was investigated. Ferrite-cementite (FC) steels with various Ferrite Grain sizes were prepared by using a low carbon steel and static tensile tests were performed at room temperature. The local elongation of the FC steels was almost the same regardless of the Ferrite Grain size, and the reduction in area decreased with decreasing Grain size. The effect of Ferrite Grain size on local deformation for the FC steels was also investigated using the estimated true stress (σ)-true strain (e) relationship up till just before fracture. In the estimated σ−e relationships of the FC steels with various Grain sizes, the true strain just before fracture was approximately 1.4 for Grain sizes of more than 0.8 μm, and σ increased with decreasing Grain size.
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effect of Ferrite Grain size on the estimated true stress true strain relationship up to the plastic deformation limit in low carbon Ferrite cementite steels
Journal of Materials Research, 2013Co-Authors: Noriyuki Tsuchida, Tadanobu Inoue, H NakanoAbstract:Grain refinement strengthening in low carbon Ferrite–cementite steel was investigated using the estimated true stress (σ)–true strain (e) relationship up to the plastic deformation limit, i.e., just before fracture. Static and stepwise tensile tests were performed using Ferrite–cementite (FC) steels with Ferrite Grain sizes in the range 0.5–34 μm, and the σ–e relationships up to the plastic deformation limit were estimated by using the Bridgman equation. In the nominal stress–strain curves, the lower yield stress and tensile strength increased and the uniform and total elongations decreased with a decrease in the Ferrite Grain size. It was found from the σ–e relationships of the FC steels that Grain refinement strengthening up to 0.8 μm can improve σ and e at the plastic deformation limit. From the scanning electron microscopy observations of the cross-sectional planes parallel to the tensile direction for the FC steels, voids were observed at the interface between Ferrite and cementite in the case where the thickness of elongated Ferrite came close to the size of the dispersed cementite.
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Effect of Ferrite Grain size on the estimated true stress–true strain relationship up to the plastic deformation limit in low carbon Ferrite–cementite steels
Journal of Materials Research, 2013Co-Authors: Noriyuki Tsuchida, Tadanobu Inoue, H NakanoAbstract:Grain refinement strengthening in low carbon Ferrite–cementite steel was investigated using the estimated true stress (σ)–true strain (e) relationship up to the plastic deformation limit, i.e., just before fracture. Static and stepwise tensile tests were performed using Ferrite–cementite (FC) steels with Ferrite Grain sizes in the range 0.5–34 μm, and the σ–e relationships up to the plastic deformation limit were estimated by using the Bridgman equation. In the nominal stress–strain curves, the lower yield stress and tensile strength increased and the uniform and total elongations decreased with a decrease in the Ferrite Grain size. It was found from the σ–e relationships of the FC steels that Grain refinement strengthening up to 0.8 μm can improve σ and e at the plastic deformation limit. From the scanning electron microscopy observations of the cross-sectional planes parallel to the tensile direction for the FC steels, voids were observed at the interface between Ferrite and cementite in the case where the thickness of elongated Ferrite came close to the size of the dispersed cementite.
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PRICM: 8 Pacific Rim International Congress on Advanced Materials and Processing - Effect of Ferrite Grain Size on Local Elongation in a Low Carbon Steel
Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 2013Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu InoueAbstract:Effect of Grain size on local elongation in low carbon steel was investigated. Ferrite-cementite (FC) steels with various Ferrite Grain sizes were prepared by using a low carbon steel and static tensile tests were performed at room temperature. The local elongation of the FC steels was almost the same regardless of the Ferrite Grain size, and the reduction in area decreased with decreasing Grain size. The effect of Ferrite Grain size on local deformation for the FC steels was also investigated using the estimated true stress (σ)-true strain (e) relationship up till just before fracture. In the estimated σ−e relationships of the FC steels with various Grain sizes, the true strain just before fracture was approximately 1.4 for Grain sizes of more than 0.8 μm, and σ increased with decreasing Grain size.
H Nakano - One of the best experts on this subject based on the ideXlab platform.
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Enhanced true stress–true strain relationships due to Grain refinement of a low-carbon Ferrite–pearlite steel
Materials Letters, 2015Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu Inoue, T. OkamotoAbstract:Abstract The fine-Grained low-carbon Ferrite–pearlite (FP) steel with the Ferrite Grain size of 3.6 μm showed enhanced true stress (σ)–true strain (e) relationships up to fracture, i.e., the plastic deformation limit. Both σ and e increased with decreasing Ferrite Grain size in the FP steels. The effect of Ferrite Grain size on the σ–e relationships up to the plastic deformation limit was dependent on the microstructure, in spite of belonging to the same low-carbon steel. In the FP steels, the smaller the pearlite size became with decreasing Ferrite Grain size, the more the pearlite could deform. The decrease in not only the Ferrite Grain size but also the secondary microstructure is effective in improving the σ–e relationship up to the plastic deformation limit.
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effect of Ferrite Grain size on local elongation in a low carbon steel
8th Pacific Rim International Congress on Advanced Materials and Processing 2013 PRICM 8, 2013Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu InoueAbstract:Effect of Grain size on local elongation in low carbon steel was investigated. Ferrite-cementite (FC) steels with various Ferrite Grain sizes were prepared by using a low carbon steel and static tensile tests were performed at room temperature. The local elongation of the FC steels was almost the same regardless of the Ferrite Grain size, and the reduction in area decreased with decreasing Grain size. The effect of Ferrite Grain size on local deformation for the FC steels was also investigated using the estimated true stress (σ)-true strain (e) relationship up till just before fracture. In the estimated σ−e relationships of the FC steels with various Grain sizes, the true strain just before fracture was approximately 1.4 for Grain sizes of more than 0.8 μm, and σ increased with decreasing Grain size.
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effect of Ferrite Grain size on the estimated true stress true strain relationship up to the plastic deformation limit in low carbon Ferrite cementite steels
Journal of Materials Research, 2013Co-Authors: Noriyuki Tsuchida, Tadanobu Inoue, H NakanoAbstract:Grain refinement strengthening in low carbon Ferrite–cementite steel was investigated using the estimated true stress (σ)–true strain (e) relationship up to the plastic deformation limit, i.e., just before fracture. Static and stepwise tensile tests were performed using Ferrite–cementite (FC) steels with Ferrite Grain sizes in the range 0.5–34 μm, and the σ–e relationships up to the plastic deformation limit were estimated by using the Bridgman equation. In the nominal stress–strain curves, the lower yield stress and tensile strength increased and the uniform and total elongations decreased with a decrease in the Ferrite Grain size. It was found from the σ–e relationships of the FC steels that Grain refinement strengthening up to 0.8 μm can improve σ and e at the plastic deformation limit. From the scanning electron microscopy observations of the cross-sectional planes parallel to the tensile direction for the FC steels, voids were observed at the interface between Ferrite and cementite in the case where the thickness of elongated Ferrite came close to the size of the dispersed cementite.
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Effect of Ferrite Grain size on the estimated true stress–true strain relationship up to the plastic deformation limit in low carbon Ferrite–cementite steels
Journal of Materials Research, 2013Co-Authors: Noriyuki Tsuchida, Tadanobu Inoue, H NakanoAbstract:Grain refinement strengthening in low carbon Ferrite–cementite steel was investigated using the estimated true stress (σ)–true strain (e) relationship up to the plastic deformation limit, i.e., just before fracture. Static and stepwise tensile tests were performed using Ferrite–cementite (FC) steels with Ferrite Grain sizes in the range 0.5–34 μm, and the σ–e relationships up to the plastic deformation limit were estimated by using the Bridgman equation. In the nominal stress–strain curves, the lower yield stress and tensile strength increased and the uniform and total elongations decreased with a decrease in the Ferrite Grain size. It was found from the σ–e relationships of the FC steels that Grain refinement strengthening up to 0.8 μm can improve σ and e at the plastic deformation limit. From the scanning electron microscopy observations of the cross-sectional planes parallel to the tensile direction for the FC steels, voids were observed at the interface between Ferrite and cementite in the case where the thickness of elongated Ferrite came close to the size of the dispersed cementite.
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PRICM: 8 Pacific Rim International Congress on Advanced Materials and Processing - Effect of Ferrite Grain Size on Local Elongation in a Low Carbon Steel
Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 2013Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu InoueAbstract:Effect of Grain size on local elongation in low carbon steel was investigated. Ferrite-cementite (FC) steels with various Ferrite Grain sizes were prepared by using a low carbon steel and static tensile tests were performed at room temperature. The local elongation of the FC steels was almost the same regardless of the Ferrite Grain size, and the reduction in area decreased with decreasing Grain size. The effect of Ferrite Grain size on local deformation for the FC steels was also investigated using the estimated true stress (σ)-true strain (e) relationship up till just before fracture. In the estimated σ−e relationships of the FC steels with various Grain sizes, the true strain just before fracture was approximately 1.4 for Grain sizes of more than 0.8 μm, and σ increased with decreasing Grain size.
Beitallah Eghbali - One of the best experts on this subject based on the ideXlab platform.
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Study on the Ferrite Grain refinement during intercritical deformation of a microalloyed steel
Materials Science and Engineering: A, 2010Co-Authors: Beitallah EghbaliAbstract:Abstract In the present research, the Ferrite Grain refinement during intercritical deformation of a low carbon microalloyed steel within the two phase (α + γ) region was investigated using hot torsion testing. The physical processes that occurred during intercritical deformation were discussed by observing the optical microstructure and analyzing the flow curve responses. The shape of the flow curve suggests that the certain dynamic softening mechanisms take place during deformation. Dynamic softening mechanisms compensate for the hardening effect of deformation and gradually keep balance with it. This flow softening is the result of deformation-induced Ferrite transformation and continuous dynamic recrystallization of Ferrite. Strain increasing promotes both of the softening mechanisms. Consequently, ultrafine Ferrite Grains continuously nucleate not only at Grain boundaries but also inside austenite and pre-eutectoid Ferrite. As a result, ultrafine Ferrite with average Grain size of ∼1.8 μm achieved. It is concluded that with strain increasing, in addition to deformation-induced Ferrite transformation, continuous dynamic recrystallization of Ferrite contributes to the further Ferrite Grain refinement.
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Mechanism of Ferrite Grain refinement during warm deformation of a low carbon Nb-microalloyed steel
Materials Science and Engineering: A, 2007Co-Authors: Amir Abdollah-zadeh, Beitallah EghbaliAbstract:Warm torsion testing was carried out on a low carbon Nb-microalloyed steel to study the mechanism of Ferrite Grain refinement during warm deformation. Deformation characteristics of Ferrite were studied by means of optical microscopy and electron back-scattering diffraction. The results show an extended flow softening of Ferrite during warm deformation. With increasing strain, the new fine Ferrite Grains surrounded by high-angle boundaries start generating at the initial boundaries. The new Grains develop as a result of gradual increase in the misorientations between the subGrains that are caused by warm deformation. With further increasing strain, the Grain sizes continuous to decrease and the number of newly generated ultrafine Grains increased. Furthermore, it was seen that there is no evidence of discontinuous dynamic recrystallization. It was concluded that the mechanism, which is responsible for the both dynamic flow softening of Ferrite and formation of new fine Grains, is continuous dynamic recrystallization.
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Influence of deformation temperature on the Ferrite Grain refinement in a low carbon Nb–Ti microalloyed steel
Journal of Materials Processing Technology, 2006Co-Authors: Beitallah Eghbali, Amir Abdollah-zadehAbstract:Abstract Grain refinement is one of the effective methods to develop new generation low carbon microalloyed steels possessing excellent combination of mechanical properties. In the present work, the microstructural evolution and Ferrite Grain refinement at various deformation temperatures were investigated using single pass isothermal hot compression experiments for a low carbon Nb–Ti microalloyed steel. The physical processes that occurred during deformation were discussed by observing the optical microstructure and analyzing the stress–strain responses. The results show that there is a close relation between the microstructural evolution and true stress–true strain responses during the deformation. Microstructural observation indicates that very fine Ferrite Grains of about 1.8–3 μm are obtained by deformation at 830–845 °C, about Ar3 ± 10 °C. The obtained stress–strain curves suggest the occurrence of strain-induced dynamic transformation (SIDT) of γ to α at this deformation temperature range.
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The influence of thermomechanical parameters in Ferrite Grain refinement in a low carbon Nb-microalloyed steel
Scripta Materialia, 2005Co-Authors: Beitallah Eghbali, Amir Abdollah-zadehAbstract:Abstract The Ferrite Grain refinement in a low carbon Nb-microalloyed steel is investigated in the present work using hot compression experiments for various deformation temperatures. The results indicate that very fine Ferrite Grains of about 2–4 μm can be obtained by deformation at 760–850 °C, due to the occurrence of strain-induced transformation (SIT) of austenite to Ferrite.
Tadanobu Inoue - One of the best experts on this subject based on the ideXlab platform.
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Enhanced true stress–true strain relationships due to Grain refinement of a low-carbon Ferrite–pearlite steel
Materials Letters, 2015Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu Inoue, T. OkamotoAbstract:Abstract The fine-Grained low-carbon Ferrite–pearlite (FP) steel with the Ferrite Grain size of 3.6 μm showed enhanced true stress (σ)–true strain (e) relationships up to fracture, i.e., the plastic deformation limit. Both σ and e increased with decreasing Ferrite Grain size in the FP steels. The effect of Ferrite Grain size on the σ–e relationships up to the plastic deformation limit was dependent on the microstructure, in spite of belonging to the same low-carbon steel. In the FP steels, the smaller the pearlite size became with decreasing Ferrite Grain size, the more the pearlite could deform. The decrease in not only the Ferrite Grain size but also the secondary microstructure is effective in improving the σ–e relationship up to the plastic deformation limit.
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effect of Ferrite Grain size on local elongation in a low carbon steel
8th Pacific Rim International Congress on Advanced Materials and Processing 2013 PRICM 8, 2013Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu InoueAbstract:Effect of Grain size on local elongation in low carbon steel was investigated. Ferrite-cementite (FC) steels with various Ferrite Grain sizes were prepared by using a low carbon steel and static tensile tests were performed at room temperature. The local elongation of the FC steels was almost the same regardless of the Ferrite Grain size, and the reduction in area decreased with decreasing Grain size. The effect of Ferrite Grain size on local deformation for the FC steels was also investigated using the estimated true stress (σ)-true strain (e) relationship up till just before fracture. In the estimated σ−e relationships of the FC steels with various Grain sizes, the true strain just before fracture was approximately 1.4 for Grain sizes of more than 0.8 μm, and σ increased with decreasing Grain size.
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effect of Ferrite Grain size on the estimated true stress true strain relationship up to the plastic deformation limit in low carbon Ferrite cementite steels
Journal of Materials Research, 2013Co-Authors: Noriyuki Tsuchida, Tadanobu Inoue, H NakanoAbstract:Grain refinement strengthening in low carbon Ferrite–cementite steel was investigated using the estimated true stress (σ)–true strain (e) relationship up to the plastic deformation limit, i.e., just before fracture. Static and stepwise tensile tests were performed using Ferrite–cementite (FC) steels with Ferrite Grain sizes in the range 0.5–34 μm, and the σ–e relationships up to the plastic deformation limit were estimated by using the Bridgman equation. In the nominal stress–strain curves, the lower yield stress and tensile strength increased and the uniform and total elongations decreased with a decrease in the Ferrite Grain size. It was found from the σ–e relationships of the FC steels that Grain refinement strengthening up to 0.8 μm can improve σ and e at the plastic deformation limit. From the scanning electron microscopy observations of the cross-sectional planes parallel to the tensile direction for the FC steels, voids were observed at the interface between Ferrite and cementite in the case where the thickness of elongated Ferrite came close to the size of the dispersed cementite.
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Effect of Ferrite Grain size on the estimated true stress–true strain relationship up to the plastic deformation limit in low carbon Ferrite–cementite steels
Journal of Materials Research, 2013Co-Authors: Noriyuki Tsuchida, Tadanobu Inoue, H NakanoAbstract:Grain refinement strengthening in low carbon Ferrite–cementite steel was investigated using the estimated true stress (σ)–true strain (e) relationship up to the plastic deformation limit, i.e., just before fracture. Static and stepwise tensile tests were performed using Ferrite–cementite (FC) steels with Ferrite Grain sizes in the range 0.5–34 μm, and the σ–e relationships up to the plastic deformation limit were estimated by using the Bridgman equation. In the nominal stress–strain curves, the lower yield stress and tensile strength increased and the uniform and total elongations decreased with a decrease in the Ferrite Grain size. It was found from the σ–e relationships of the FC steels that Grain refinement strengthening up to 0.8 μm can improve σ and e at the plastic deformation limit. From the scanning electron microscopy observations of the cross-sectional planes parallel to the tensile direction for the FC steels, voids were observed at the interface between Ferrite and cementite in the case where the thickness of elongated Ferrite came close to the size of the dispersed cementite.
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PRICM: 8 Pacific Rim International Congress on Advanced Materials and Processing - Effect of Ferrite Grain Size on Local Elongation in a Low Carbon Steel
Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 2013Co-Authors: Noriyuki Tsuchida, H Nakano, Tadanobu InoueAbstract:Effect of Grain size on local elongation in low carbon steel was investigated. Ferrite-cementite (FC) steels with various Ferrite Grain sizes were prepared by using a low carbon steel and static tensile tests were performed at room temperature. The local elongation of the FC steels was almost the same regardless of the Ferrite Grain size, and the reduction in area decreased with decreasing Grain size. The effect of Ferrite Grain size on local deformation for the FC steels was also investigated using the estimated true stress (σ)-true strain (e) relationship up till just before fracture. In the estimated σ−e relationships of the FC steels with various Grain sizes, the true strain just before fracture was approximately 1.4 for Grain sizes of more than 0.8 μm, and σ increased with decreasing Grain size.
Amir Abdollah-zadeh - One of the best experts on this subject based on the ideXlab platform.
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Mechanism of Ferrite Grain refinement during warm deformation of a low carbon Nb-microalloyed steel
Materials Science and Engineering: A, 2007Co-Authors: Amir Abdollah-zadeh, Beitallah EghbaliAbstract:Warm torsion testing was carried out on a low carbon Nb-microalloyed steel to study the mechanism of Ferrite Grain refinement during warm deformation. Deformation characteristics of Ferrite were studied by means of optical microscopy and electron back-scattering diffraction. The results show an extended flow softening of Ferrite during warm deformation. With increasing strain, the new fine Ferrite Grains surrounded by high-angle boundaries start generating at the initial boundaries. The new Grains develop as a result of gradual increase in the misorientations between the subGrains that are caused by warm deformation. With further increasing strain, the Grain sizes continuous to decrease and the number of newly generated ultrafine Grains increased. Furthermore, it was seen that there is no evidence of discontinuous dynamic recrystallization. It was concluded that the mechanism, which is responsible for the both dynamic flow softening of Ferrite and formation of new fine Grains, is continuous dynamic recrystallization.
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Influence of deformation temperature on the Ferrite Grain refinement in a low carbon Nb–Ti microalloyed steel
Journal of Materials Processing Technology, 2006Co-Authors: Beitallah Eghbali, Amir Abdollah-zadehAbstract:Abstract Grain refinement is one of the effective methods to develop new generation low carbon microalloyed steels possessing excellent combination of mechanical properties. In the present work, the microstructural evolution and Ferrite Grain refinement at various deformation temperatures were investigated using single pass isothermal hot compression experiments for a low carbon Nb–Ti microalloyed steel. The physical processes that occurred during deformation were discussed by observing the optical microstructure and analyzing the stress–strain responses. The results show that there is a close relation between the microstructural evolution and true stress–true strain responses during the deformation. Microstructural observation indicates that very fine Ferrite Grains of about 1.8–3 μm are obtained by deformation at 830–845 °C, about Ar3 ± 10 °C. The obtained stress–strain curves suggest the occurrence of strain-induced dynamic transformation (SIDT) of γ to α at this deformation temperature range.
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The influence of thermomechanical parameters in Ferrite Grain refinement in a low carbon Nb-microalloyed steel
Scripta Materialia, 2005Co-Authors: Beitallah Eghbali, Amir Abdollah-zadehAbstract:Abstract The Ferrite Grain refinement in a low carbon Nb-microalloyed steel is investigated in the present work using hot compression experiments for various deformation temperatures. The results indicate that very fine Ferrite Grains of about 2–4 μm can be obtained by deformation at 760–850 °C, due to the occurrence of strain-induced transformation (SIT) of austenite to Ferrite.