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Lijian Rong - One of the best experts on this subject based on the ideXlab platform.
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the influence of Tempering Temperature on the reversed austenite formation and tensile properties in fe 13 cr 4 ni mo low carbon martensite stainless steels
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011Co-Authors: Yuanyuan Song, Lijian RongAbstract:The influence of Tempering Temperature on the reversed austenite formation and tensile properties are investigated in Fe-13%Cr-4%Ni-Mo low carbon martensite stainless steel in the Temperature range of 550-950 degrees C. It is found that at the Temperatures below 680 degrees C, the reversed austenite formation occurs by diffusion. Amount of the reversed austenite is determined I:IN the Tempering Temperature and the holding time. The segregation of Ni is the main reason for the stability of the reversed austenite. When the Temperatures are above 680 degrees C, the reversed austenite formation proceeds by diffusionless. The reversed austenite will transform back to martensite after cooled to room Temperature. The tensile properties are most strongly influenced by the amount of the reversed austenite obtained at room Temperature. The excellent combination of good strength and ductility is at 610 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
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Variation of the Reversed Austenite Amount with the Tempering Temperature in a Fe-13%Cr-4%Ni-Mo Martensitic Stainless Steel
Materials Science Forum, 2010Co-Authors: Yuanyuan Song, Fuxing Yin, Dehai Ping, Lijian RongAbstract:Tempering Temperature dependence of the amount of the reversed austenite in the range of 570 oC to 680 oC was investigated by means of X-ray diffraction (XRD) measurements and transmission electron microscopy (TEM) in a low carbon Fe-13%Cr-4%Ni-Mo (wt.%) martensitic stainless steel. It was found that the reversed austenite began to form at the tempered Temperature slightly above the As Temperature. As the tempered Temperature increased, the amount of the reversed austenite changed little in the Temperature range of 580-595 oC. Then, the amount of the reversed austenite increased sharply with the increased tempered Temperature. When the tempered Temperature increased to about 620 oC, the amount of the reversed austenite exhibited a peak. Afterward, it decreased quickly at the elevated tempered Temperature. The microstructural evolvement of the reversed austenite at different Tempering Temperature was also observed by TEM.
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variation of the reversed austenite amount with the Tempering Temperature in a fe 13 cr 4 ni mo martensitic stainless steel
Materials Science Forum, 2010Co-Authors: Yuanyuan Song, Fuxing Yin, D H Ping, Lijian RongAbstract:Tempering Temperature dependence of the amount of the reversed austenite in the range of 570 oC to 680 oC was investigated by means of X-ray diffraction (XRD) measurements and transmission electron microscopy (TEM) in a low carbon Fe-13%Cr-4%Ni-Mo (wt.%) martensitic stainless steel. It was found that the reversed austenite began to form at the tempered Temperature slightly above the As Temperature. As the tempered Temperature increased, the amount of the reversed austenite changed little in the Temperature range of 580-595 oC. Then, the amount of the reversed austenite increased sharply with the increased tempered Temperature. When the tempered Temperature increased to about 620 oC, the amount of the reversed austenite exhibited a peak. Afterward, it decreased quickly at the elevated tempered Temperature. The microstructural evolvement of the reversed austenite at different Tempering Temperature was also observed by TEM.
A. A. Shirzadi - One of the best experts on this subject based on the ideXlab platform.
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Effect of Tempering Temperature on the Microstructure and Hardness of a Super-bainitic Steel Containing Co and Al
Isij International, 2014Co-Authors: Tingping Hou, A. A. ShirzadiAbstract:The effect of Tempering Temperature, within the range of 400 to 700°C, on the microstructure and hardness of two super-bainitic steels, one as the control parent sample and the other with added Co & Al was investigated. Post-Tempering examinations of the super-bainitic samples showed that low Temperature Tempering cycles (400–500°C) resulted in carbides formation, and some increases in the hardness possibly due to precipitation strengthening in the Co & Al contained steel. Once the Tempering Temperature increased to 600°C, the hardness plummeted in both steels due to the concurrent coarsening of the bainitic ferrite plates and more precipitation of carbides. At the higher Tempering Temperature of 700°C, further reduction in the hardness occurred because of the accelerated recovery of ferrite and spheroidization of carbides. This work clearly showed that the super-bainitic steel containing Co & Al had a superior Tempering resistance particularly at low Tempering Temperatures (
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effect of Tempering Temperature on the microstructure and hardness of a super bainitic steel containing co and al
Isij International, 2014Co-Authors: Tingping Hou, A. A. ShirzadiAbstract:The effect of Tempering Temperature, within the range of 400 to 700°C, on the microstructure and hardness of two super-bainitic steels, one as the control parent sample and the other with added Co & Al was investigated. Post-Tempering examinations of the super-bainitic samples showed that low Temperature Tempering cycles (400–500°C) resulted in carbides formation, and some increases in the hardness possibly due to precipitation strengthening in the Co & Al contained steel. Once the Tempering Temperature increased to 600°C, the hardness plummeted in both steels due to the concurrent coarsening of the bainitic ferrite plates and more precipitation of carbides. At the higher Tempering Temperature of 700°C, further reduction in the hardness occurred because of the accelerated recovery of ferrite and spheroidization of carbides. This work clearly showed that the super-bainitic steel containing Co & Al had a superior Tempering resistance particularly at low Tempering Temperatures (<500°C) due to reduced carbide precipitation in the presence of Co & Al.
Zhouhua Jiang - One of the best experts on this subject based on the ideXlab platform.
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effect of quenching and Tempering Temperature on microstructure and tensile properties of microalloyed ultra high strength suspension spring steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2019Co-Authors: Kui Chen, Zhouhua Jiang, Fubin Liu, Wei Gong, Changyong ChenAbstract:Abstract Effects of quenching-Tempering heat treatment on microstructural evolution and fracture behavior of microalloyed high strength suspension spring 55SiCrVNb were investigated. The results showed that an optimal combination of mechanical properties was obtained at the heat-treatment of oil quenching from 900 °C and Tempering at 400 °C. Specifically, the ultimate tensile strength, yield strength, elongation and area reduction reached 2021 MPa, 1826 MPa, 10.3% and 42.7%, respectively. With the increasing austenitizing Temperature, the grain size increased monotonically with more carbides dissolved in the matrix, and the strength first increased significantly and then decreased slowly. Furthermore, the fracture behavior transformed from ductile fracture to brittle fracture. In addition, the strengths were weakened dramatically as the Tempering Temperature increased but the elongation and area reduction were enhanced. Three kind of carbides are identified at different Tempering Temperatures, namely the coherent M2.5C and MC carbides gradually mature into large-sized non-coherent M3C and M7C3 carbides. Moreover, the dislocation reduction, lath boundary and twin martensite decomposition and carbide coarsening were exacerbated at higher Tempering Temperature while the fracture behavior changed from brittle fracture to ductile fracture.
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effect of Tempering Temperature on the microstructure and properties of ultrahigh strength stainless steel
Journal of Materials Science & Technology, 2019Co-Authors: Yangpeng Zhang, Dongping Zhan, Zhouhua JiangAbstract:Abstract The microstructure, precipitation and mechanical properties of Ferrium S53 steel, a secondary hardening ultrahigh-strength stainless steel with 10% Cr developed by QuesTek Innovations LLC, upon Tempering were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and tensile and impact tests. Based on these results, the influence of the Tempering Temperature on the microstructure and properties was discussed. The results show that decomposition occurred when the retained austenite was tempered above 440 °C and that the hardening peak at 482 °C was caused by the joint strengthening of the precipitates and martensite transformation. Due to the high Cr content, the trigonal M7C3 carbide precipitated when the steel was tempered at 400 °C, and M7C3 and M2C (5–10 nm in size) coexisted when it was tempered at 482 °C. When the steel was tempered at 630 °C, M2C and M23C6 carbides precipitated, and the sizes were greater than 50 nm and 500 nm, respectively, but no M7C3 carbide formed. When the Tempering Temperature was above 540 °C, austenitization and large-size precipitates were the main factors affecting the strength and toughness.
Yuanyuan Song - One of the best experts on this subject based on the ideXlab platform.
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the influence of Tempering Temperature on the reversed austenite formation and tensile properties in fe 13 cr 4 ni mo low carbon martensite stainless steels
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011Co-Authors: Yuanyuan Song, Lijian RongAbstract:The influence of Tempering Temperature on the reversed austenite formation and tensile properties are investigated in Fe-13%Cr-4%Ni-Mo low carbon martensite stainless steel in the Temperature range of 550-950 degrees C. It is found that at the Temperatures below 680 degrees C, the reversed austenite formation occurs by diffusion. Amount of the reversed austenite is determined I:IN the Tempering Temperature and the holding time. The segregation of Ni is the main reason for the stability of the reversed austenite. When the Temperatures are above 680 degrees C, the reversed austenite formation proceeds by diffusionless. The reversed austenite will transform back to martensite after cooled to room Temperature. The tensile properties are most strongly influenced by the amount of the reversed austenite obtained at room Temperature. The excellent combination of good strength and ductility is at 610 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
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Variation of the Reversed Austenite Amount with the Tempering Temperature in a Fe-13%Cr-4%Ni-Mo Martensitic Stainless Steel
Materials Science Forum, 2010Co-Authors: Yuanyuan Song, Fuxing Yin, Dehai Ping, Lijian RongAbstract:Tempering Temperature dependence of the amount of the reversed austenite in the range of 570 oC to 680 oC was investigated by means of X-ray diffraction (XRD) measurements and transmission electron microscopy (TEM) in a low carbon Fe-13%Cr-4%Ni-Mo (wt.%) martensitic stainless steel. It was found that the reversed austenite began to form at the tempered Temperature slightly above the As Temperature. As the tempered Temperature increased, the amount of the reversed austenite changed little in the Temperature range of 580-595 oC. Then, the amount of the reversed austenite increased sharply with the increased tempered Temperature. When the tempered Temperature increased to about 620 oC, the amount of the reversed austenite exhibited a peak. Afterward, it decreased quickly at the elevated tempered Temperature. The microstructural evolvement of the reversed austenite at different Tempering Temperature was also observed by TEM.
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variation of the reversed austenite amount with the Tempering Temperature in a fe 13 cr 4 ni mo martensitic stainless steel
Materials Science Forum, 2010Co-Authors: Yuanyuan Song, Fuxing Yin, D H Ping, Lijian RongAbstract:Tempering Temperature dependence of the amount of the reversed austenite in the range of 570 oC to 680 oC was investigated by means of X-ray diffraction (XRD) measurements and transmission electron microscopy (TEM) in a low carbon Fe-13%Cr-4%Ni-Mo (wt.%) martensitic stainless steel. It was found that the reversed austenite began to form at the tempered Temperature slightly above the As Temperature. As the tempered Temperature increased, the amount of the reversed austenite changed little in the Temperature range of 580-595 oC. Then, the amount of the reversed austenite increased sharply with the increased tempered Temperature. When the tempered Temperature increased to about 620 oC, the amount of the reversed austenite exhibited a peak. Afterward, it decreased quickly at the elevated tempered Temperature. The microstructural evolvement of the reversed austenite at different Tempering Temperature was also observed by TEM.
Chunming Lin - One of the best experts on this subject based on the ideXlab platform.
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effects of Tempering Temperature on microstructural evolution and mechanical properties of high strength low alloy d6ac plasma arc welds
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016Co-Authors: Chunming LinAbstract:Abstract This study prepared high-strength low-alloy (HSLA) D6AC weldments using a plasma arc welding (PAW) process. The PAW weldments were then tempered at Temperatures of 300 °C, 450 °C, and 600 °C for 1000 min. Microstructural characteristics of the weld in as-welded HSLA-D6AC, tempered D6AC, and tensile-tested D6AC were observed via optical microscopy (OM). We also investigated the hardness, tensile strength, and V-notched tensile strength (NTS) of the tempered specimens using a Vickers hardness tester and a universal testing machine. The fracture surfaces of the specimens were observed using a scanning electron microscope (SEM). Our results show that the mechanical properties and microstructural features of the HSLA weldments are strongly dependent on Tempering Temperature. An increase in Tempering Temperature led to a decrease in the hardness and tensile strength of the weldments but led to an increase in ductility. These effects can be attributed to the transformation of the microstructure and its effect on fracture characteristics. The specimens tempered at 300 °C and 450 °C failed in a ductile-brittle manner due to the presence of inter-lath austenite in the microstructure. After Tempering at a higher Temperature of 600 °C, martensite embrittlement did not occur, such that specimens failure was predominantly in a ductile manner. In the NTS specimens, an increase in Tempering Temperature led to a reduction in tensile strength due to notch embrittlement and the effects of grain boundary thickening and sliding. Our findings provide a valuable reference for the application of HSLA-D6AC steel in engineering and other fields.
