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首页> 外文会议>New developments on metallurgy and applications of high strength steels >EFFECTS OF LOW TEMPERATURE HEAT TREATMENTS ON MICROSTRUCTURES AND PROPERTIES OF 0.2-0.3C COLD ROLLED MARTENSITIC STEELS
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EFFECTS OF LOW TEMPERATURE HEAT TREATMENTS ON MICROSTRUCTURES AND PROPERTIES OF 0.2-0.3C COLD ROLLED MARTENSITIC STEELS

机译：低温热处理对0.2-0.3％C冷轧马氏体钢的组织和性能的影响

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摘要

Low temperature tempered (LTT) martensitic steel is considered a favorable alternative for ultrahigh strength cold rolled products with improved ductility for automotive applications since they preserve much of the high strength of as-quenched martensite showing ductility and good press formability, particularly stretch flangeability. Moreover, it has been claimed that the strength-ductility compromise of LTT martensite is further enhanced when lower bainite is present in the constituent’s composition. A study has been made on the effect of the type and the temperature of heat treatments after quenching on these mixed microstructures, their mechanical properties and formability for 0.2 and 0.3%C cold rolled steels. Low tempering treatments have been applied in the laboratory on cold rolled strips after austenitization and quenching either straight to room temperature (Q+T) to obtain fully martensitic phase or interrupted at the heat treatment temperatures (IQ+T) to promote the formation of bainite by low temperature decomposition of austenite. Ductile 1400MPa and 1600MPa grades were obtained for 0.2 and 0.3%C steels respectively having 10% total elongation. The strength-ductility compromise was clearly sensitive to the type of treatment. The differences in the mechanical properties, formability and weldability of these steels are discussed in terms of the complex microstructures that were obtained. The evolution and effect of retained austenite was also discussed
机译：低温回火（LTT）马氏体钢被认为是超高强度冷轧产品的理想替代品，具有改善的延展性，可用于汽车应用，因为它们保留了许多淬火后的马氏体高强度，表现出延展性和良好的冲压成形性，尤其是拉伸凸缘性。此外，据称，当低熔点贝氏体成分中存在低贝氏体时，LTT马氏体的强度-延展性折衷会进一步增强。已经研究了淬火后热处理的类型和温度对这些混合显微组织，0.2和0.3％C冷轧钢的力学性能和可成形性的影响。奥氏体化后，实验室对冷轧带钢进行了低回火处理，然后直接淬火至室温（Q + T）以获得完全的马氏体相，或在热处理温度（IQ + T）处中断以促进贝氏体的形成经低温奥氏体分解。对于总伸长率为10％的0.2％和0.3％C的钢，获得了1400MPa和1600MPa的韧性等级。强度-延展性的折衷显然对治疗类型敏感。根据获得的复杂的微观结构，讨论了这些钢的机械性能，可成形性和可焊接性的差异。还讨论了残余奥氏体的演变和影响

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