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首页> 外文期刊>Materials Science and Engineering >Role of martensite/austenite constituents in novel ultra-high strength TRIP-assisted steels subjected to non-isothermal annealing
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Role of martensite/austenite constituents in novel ultra-high strength TRIP-assisted steels subjected to non-isothermal annealing

机译：马氏体/奥氏体成分在新型非高强度TRIP辅助非等温退火钢中的作用

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摘要

A novel ultra-high strength transformation-induced plasticity (TRIP) steels with submicron-size martensite/austenite (M/A) constituents was processed by non-isothermal annealing process and compared with quenching and partitioning (Q&P) steels. The microstructure was characterized by means of SEM equipped with EPMA, XRD, EBSD and TEM and its effects on tensile strength and ductility were studied. The non-isothermal annealing significantly refined the parent austenite grains and enhanced inhomogeneous distribution of C atoms within the grains. Moreover, a large fraction of M/A constituents were separated and refined to hundreds of nanometers through bainite transformation in TRIP steels, while blocky retained austenite mainly existed near the carbon-rich prior grain boundaries in Q&P steel. TRIP steels had a higher content of less stable retained austenite by isothermal bainite transformation than Q&P steel, thereby favoring for improving the ductility. The contribution of fresh martensite to the ultimate tensile strength increased gradually from 49.7% to 67.3% with increase in the volume fraction of fresh martensite in TRIP steels. Optimizing the volume fraction and size of M/A constituents was important to obtain a high ultimate strength with desired ductility. The excellent mechanical properties were obtained in TRIP-350 (austempering at 350 degrees C) with ultimate tensile strength of 1011 MPa, total elongation of 28.80% and the product of strength and elongation (PSE) of 29.1 GPa%, exceeded the properties of Q&P steel.
机译：通过非等温退火工艺对具有亚微米尺寸马氏体/奥氏体（M / A）成分的新型超高强度相变诱导塑性（TRIP）钢进行了处理，并与淬火和分配（Q＆P）钢进行了比较。通过配备EPMA，XRD，EBSD和TEM的SEM表征了显微组织，并研究了其对拉伸强度和延展性的影响。非等温退火显着细化了原始奥氏体晶粒，并增强了晶粒内碳原子的不均匀分布。此外，TRIP钢中的贝氏体转变将大部分M / A成分分离并精制到数百纳米，而块状残余奥氏体主要存在于Q＆P钢中富碳的先验晶界附近。与Q＆P钢相比，TRIP钢通过等温贝氏体相变具有更高的含量，不稳定的残余奥氏体含量较高，从而有利于延展性。随着TRIP钢中新鲜马氏体体积分数的增加，新鲜马氏体对极限抗拉强度的贡献从49.7％逐渐增加到67.3％。优化M / A成分的体积分数和大小对于获得具有所需延展性的高极限强度至关重要。在TRIP-350（350摄氏度回火）中获得了优异的机械性能，极限拉伸强度为1011 MPa，总伸长率为28.80％，强度和伸长率（PSE）的乘积为29.1 GPa％，超过了Q＆P的性能。钢。

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