通过双相区等温-水淬(I&Q)和双相区等温-奥氏体化-盐浴等温后水淬(I&Q&P)处理工艺,采用电子探针(EMPA)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)和拉伸实验等手段,研究了低碳硅锰钢中Mn元素的配分行为及奥氏体化工艺参数对I&Q&P工艺处理后材料的组织与性能的影响.结果表明:经I&Q&P工艺处理,短时奥氏体化后并未消除I&Q工艺Mn配分效果,其室温组织为板条状马氏体和残留奥氏体.随奥氏体化程度增加,材料的抗拉强度先升高后降低,最高可达1267 MPa,材料的伸长率不断降低.在恰好完全奥氏体化时的晶粒尺寸较小且C、Mn聚集程度最佳,此时残留奥氏体含量最高,伸长率的降低得以补偿.最高强塑积可达30345 MPa·％,实现了强度和塑性的优良结合.
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