The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform
M. H. Baarman - One of the best experts on this subject based on the ideXlab platform.
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Notch Toughness in hot-rolled low carbon steel wire rod
Journal of Materials Engineering and Performance, 1999Co-Authors: M. H. BaarmanAbstract:Charpy V-Notch Toughness has been investigated in four hot-rolled, low carbon steels with different grain sizes and carbon contents between 0.019 and 0.057%. The raw material was wire rod designed for drawing and possible subsequent cold heading operations and manufactured from continuous cast billets. In this study, the influence of microstructure, mechanical properties, and alloying elements on the ductile-brittle transition behavior has been assessed. A particular emphasis has been given to the influence of boron with contents up to 0.0097%.
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Notch Toughness in hot-rolled low carbon steel wire rod
Journal of Materials Engineering and Performance, 1999Co-Authors: M. H. BaarmanAbstract:Charpy V-Notch Toughness has been investigated in four hot-rolled, low carbon steels with different grain sizes and carbon contents between 0.019 and 0.057%. The raw material was wire rod designed for drawing and possible subsequent cold heading operations and manufactured from continuous cast billets. In this study, the influence of microstructure, mechanical properties, and alloying elements on the ductile-brittle transition behavior has been assessed. A particular emphasis has been given to the influence of boron with contents up to 0.0097%. As a result, transition temperatures between −29 and +50°C explicated by the material properties have been obtained. The examination also shows that the transition temperature raises with circa 0.5°C for each added ppm boron most likely as a consequence of an enlargement of the ferrite grain size and the reduction of yield and tensile strength. The highest upper shelf energy and lowest transition temperature can be observed in a steel without boron additions and with maximum contents of carbon, silicon, and manganese.
W. J. Chen - One of the best experts on this subject based on the ideXlab platform.
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The Influence of Shielding Gas on Notch Toughness of Stainless Steel Weld Metals
Materials and Manufacturing Processes, 1998Co-Authors: M. T. Liao, W. J. ChenAbstract:Abstract The study aims to examine how the Notch Toughness of stainless steel weld metals are influenced by the shielding gas. The compositions of shielding gas have significant effect on the Notch Toughness of the stainless steel weld metal using solid wires, but only slight effect while using flux-cored wires. Inclusions and/or delta-ferrite have pronounced effects on the Notch Toughness of all the deposited metals. Both vermicular and lathy ferrite are observed, and the ferrite content is decreased by increasing the amount of CO2 in the Ar + CO2 mixtures in both group samples.
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The effect of shielding-gas compositions on the microstructure and mechanical properties of stainless steel weldments
Materials Chemistry and Physics, 1998Co-Authors: M. T. Liao, W. J. ChenAbstract:Abstract This study aims to examine how the microstructure and mechanical properties of AISI 304 stainless steel welds are influenced by the shielding gas. The spatter rates increase as the CO 2 content of the Ar + CO 2 shielding-gas mixtures increases from 2 to 20%. The Notch Toughness of all the weld metals is affected by the delta-ferrite and oxygen potential. At room temperature, the Notch Toughness property is strongly dependent on oxygen potential. At — 196°C, both delta-ferrite and oxide inclusions are detrimental to the Notch Toughness properties, but the delta-ferrite plays a much more important role at this temperature. Both vermicular and lathy ferrite are observed, and the ferrite content decreases as the CO 2 level of the Ar + CO 2 mixtures increases from 2 to 20%.
M. T. Liao - One of the best experts on this subject based on the ideXlab platform.
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The Influence of Shielding Gas on Notch Toughness of Stainless Steel Weld Metals
Materials and Manufacturing Processes, 1998Co-Authors: M. T. Liao, W. J. ChenAbstract:Abstract The study aims to examine how the Notch Toughness of stainless steel weld metals are influenced by the shielding gas. The compositions of shielding gas have significant effect on the Notch Toughness of the stainless steel weld metal using solid wires, but only slight effect while using flux-cored wires. Inclusions and/or delta-ferrite have pronounced effects on the Notch Toughness of all the deposited metals. Both vermicular and lathy ferrite are observed, and the ferrite content is decreased by increasing the amount of CO2 in the Ar + CO2 mixtures in both group samples.
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The effect of shielding-gas compositions on the microstructure and mechanical properties of stainless steel weldments
Materials Chemistry and Physics, 1998Co-Authors: M. T. Liao, W. J. ChenAbstract:Abstract This study aims to examine how the microstructure and mechanical properties of AISI 304 stainless steel welds are influenced by the shielding gas. The spatter rates increase as the CO 2 content of the Ar + CO 2 shielding-gas mixtures increases from 2 to 20%. The Notch Toughness of all the weld metals is affected by the delta-ferrite and oxygen potential. At room temperature, the Notch Toughness property is strongly dependent on oxygen potential. At — 196°C, both delta-ferrite and oxide inclusions are detrimental to the Notch Toughness properties, but the delta-ferrite plays a much more important role at this temperature. Both vermicular and lathy ferrite are observed, and the ferrite content decreases as the CO 2 level of the Ar + CO 2 mixtures increases from 2 to 20%.
John J. Lewandowski - One of the best experts on this subject based on the ideXlab platform.
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A Damage-tolerant Bulk Metallic Glass at Liquid-nitrogen Temperature
Journal of Materials Science & Technology, 2014Co-Authors: Mohsen Seifi, Weihua Wang, John J. LewandowskiAbstract:Tensile tests and Notch Toughness tests were conducted on Zr61Ti2Cu25Al12 glass (ZT) at room temperature and liquid-nitrogen temperature. The tensile strength of ZT was improved from 1.63 GPa at room temperature to 1.72 GPa at liquid-nitrogen temperature. Micro-Notches with a root radius of 1–3 μm were introduced to test the Notch Toughness of ZT at room temperature and liquid-nitrogen temperature. The test results revealed that the Notch Toughness of ZT at liquid-nitrogen temperature is comparable to that of ZT at room temperature. The combination of high yield strength and Notch Toughness of ZT at liquid-nitrogen temperature is comparable to that of the best cryogenic engineering materials.
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Chemistry (intrinsic) and inclusion (extrinsic) effects on the Toughness and Weibull modulus of Fe-based bulk metallic glasses
Philosophical Magazine Letters, 2008Co-Authors: A. Shamimi Nouri, S.j. Poon, Gary J. Shiflet, John J. LewandowskiAbstract:Systematic changes in composition were employed to increase the Notch Toughness of a variety of Fe-based Bulk Metallic Glasses (BMGs). The Fe50Mn10Mo14Cr4C16B6 BMG possessed very high hardness (e.g. 12 GPa) but very low Notch Toughness (e.g. 5.7 MPa m1/2) at room temperature, consistent with fracture surface observations of brittle features. Many of the other Fe-BMG variants, created to change the Poisson's ratio via systematic changes in alloy chemistry, exhibited higher Toughness but more scatter in the data, reflected in a lower Weibull modulus. SEM examination revealed fracture initiation always occurred at inclusions in samples exhibiting lower Toughness and/or Weibull modulus for a given chemistry. Implications of these observations on reliability of BMGs are discussed.
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Preliminary assessment of flow, Notch Toughness, and high temperature behavior of Cu60Zr20Hf10Ti10 bulk metallic glass
Scripta Materialia, 2004Co-Authors: P. Wesseling, T.g. Nieh, Weihua Wang, John J. LewandowskiAbstract:Microhardness, hot hardness, uniaxial compression, and Notched bending experiments were conducted on Cu60Zr20Hf10Ti10 bulk metallic glass (BMG). This Cu-based BMG possesses near theoretical strength but essentially zero compressive ductility at room temperature. Notch Toughness values in excess of 65 MParootm were obtained, while significant softening was obtained near T-q (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Weihua Wang - One of the best experts on this subject based on the ideXlab platform.
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a novel feni based bulk metallic glass with high Notch Toughness over 70 mpa m1 2 combined with excellent soft magnetic properties
Materials & Design, 2020Co-Authors: Jing Zhou, Qianqian Wang, Xidong Hui, Qiaoshi Zeng, Yuwei Xiong, Kuibo Yin, Baoan Sun, Litao Sun, M Stoica, Weihua WangAbstract:Abstract A novel Fe39Ni39B12.82Si2.75Nb2.3P4.13 bulk metallic glass (BMG) with high Notch Toughness of 72.3 MPa m1/2, large plastic strain of 9.8%, high yield strength of 2930 MPa, and a large critical diameter of 2.5 mm was successfully developed. This BMG also exhibits excellent soft magnetic properties, i.e., higher saturation magnetic flux density of 0.86 T, extremely low coercivity of 0.65 A/m, and high effective permeability of 23,250 with high frequency stability. Its Toughness value is the highest among Fe-based BMG family. The origin of high Toughness was also investigated in detail by using synchrotron X-ray diffraction and aberration-corrected high-resolution transmission electron microscopy. It was found that the high Toughness are attributed to atomic-scale structural heterogeneity that resulted from large free volume, high content of metal-metal bonds and high structural disorder degree, which can promote the multiple shear bands and hinder the subsequently propagation. This work provides useful guidelines for developing tough FeNi-based BMGs with high strength and excellent soft magnetic properties from an atomic structural perspective.
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A Damage-tolerant Bulk Metallic Glass at Liquid-nitrogen Temperature
Journal of Materials Science & Technology, 2014Co-Authors: Mohsen Seifi, Weihua Wang, John J. LewandowskiAbstract:Tensile tests and Notch Toughness tests were conducted on Zr61Ti2Cu25Al12 glass (ZT) at room temperature and liquid-nitrogen temperature. The tensile strength of ZT was improved from 1.63 GPa at room temperature to 1.72 GPa at liquid-nitrogen temperature. Micro-Notches with a root radius of 1–3 μm were introduced to test the Notch Toughness of ZT at room temperature and liquid-nitrogen temperature. The test results revealed that the Notch Toughness of ZT at liquid-nitrogen temperature is comparable to that of ZT at room temperature. The combination of high yield strength and Notch Toughness of ZT at liquid-nitrogen temperature is comparable to that of the best cryogenic engineering materials.
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Preliminary assessment of flow, Notch Toughness, and high temperature behavior of Cu60Zr20Hf10Ti10 bulk metallic glass
Scripta Materialia, 2004Co-Authors: P. Wesseling, T.g. Nieh, Weihua Wang, John J. LewandowskiAbstract:Microhardness, hot hardness, uniaxial compression, and Notched bending experiments were conducted on Cu60Zr20Hf10Ti10 bulk metallic glass (BMG). This Cu-based BMG possesses near theoretical strength but essentially zero compressive ductility at room temperature. Notch Toughness values in excess of 65 MParootm were obtained, while significant softening was obtained near T-q (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
