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采用室温拉伸实验并结合SEM、TEM、XRD以及X射线应力仪原位测定技术,研究不同TRIP处理条件下的高强度TRIP钢的力学性能与显微组织。结果表明,当两相区处理为800℃×3 min,贝氏体区处理为400℃×5 min时,试验钢的抗拉强度可达975.68 MPa,伸长率为27.88%,强塑积可达27202 MPa%;在外加应力作用下,TRIP钢中残留奥氏体在屈服点之后发生向马氏体的转变,残留奥氏体向马氏体的转变为应变诱发相变;同时,残留奥氏体随应变增大而降低的趋势减缓,其强塑性越好,残留奥氏体发生向马氏体的渐进式转变使其TRIP效应更为显著;此外,试验钢中残留奥氏体多呈薄膜状,具有较好的强塑性。
The mechanical properties and microstructure of high strength TRIP steels under different conditions of TRIP were studied by tensile test at room temperature and SEM, TEM, XRD and in-situ X-ray stress meter. The results show that when the two-phase zone is treated at 800 ℃ for 3 min and the bainite zone is treated at 400 ℃ for 5 min, the tensile strength of the test steel can reach 975.68 MPa with an elongation of 27.88% Reaching 27202 MPa%. Under the applied stress, the retained austenite in TRIP steel changed to martensite after yield point, and the transformation from residual austenite to martensite was strain-induced phase transformation. Meanwhile, The tendency of austenite to decrease with the increase of strain is slowed down. The stronger the ductility is, the more gradual change of retained austenite to martensite makes the TRIP effect more remarkable. In addition, the residual austenite in test steel is mostly Thin film, with good strong plasticity.