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利用SEM、XRD分析及拉伸试验,研究了逆转变+淬火-配分(ART+Q&P)复合工艺对完全淬火后0.22C-2.0Mn-1.8Si钢组织性能的影响。结果表明:经ART+Q&P工艺处理后,该钢组织为亚温铁素体、贝氏体/马氏体和均匀分布的残留奥氏体。逆转变奥氏体富集Mn、C元素,淬火-配分过程中碳自马氏体配分至残留奥氏体时二次富C,使其稳定化,因此该钢室温下获得残留奥氏体的含量超过15%。在拉伸变形过程中残留奥氏体转变成马氏体的TRIP效应,使得钢材在变形过程中获得稳定的加工硬化能力,实现了良好的强塑性结合,抗拉强度达到1233 MPa,屈服强度为893 MPa,均匀伸长率29.6%,强塑积高达36 GPa·%以上。
The microstructure and mechanical properties of 0.22C-2.0Mn-1.8Si steel after complete quenching were studied by means of SEM, XRD and tensile test. The effects of reverse transformation + quenching-partitioning (ART + Q & P) The results show that the microstructure of the steel is sub-ferritic ferrite, bainite / martensite and uniformly distributed retained austenite after ART + Q & P process. Retrogression austenite enrichment of Mn, C elements, quenching - Partitioning process of carbon from martensite to the residual austenite when the second enrichment of C, to stabilize, so the steel at room temperature to obtain retained austenite Content of more than 15%. In the process of tensile deformation, the TRIP effect of retained austenite into martensite can make the steel get stable work-hardening ability during deformation and achieve good strong plastic bonding with a tensile strength of 1233 MPa and a yield strength of 893 MPa, uniform elongation of 29.6%, high plastic product up to 36 GPa ·%.