研究一种新型的两相区不同退火温度的淬火和碳再分配热处理工艺对低碳硅一锰系Q＆P钢的显微组织、精细结构的影响，并和奥氏体区退火的Q＆P热处理工艺进行对比。通过SEM、TEM分析发现，采用两相区退火的Q＆P工艺室温组织为板条马氏体、铁素体和薄膜状残留奥氏体。残留奥氏体以两种形态存在：处于马氏体板条间的薄膜状和位于原奥氏体晶界处的块状。两相区热处理后的Q＆P钢，不仅抗拉强度高达1000MPa以上，其伸长率也高达23％以上，体积分数高达11％的残留奥氏体在组织中起到了相变诱发塑性的作用。
Effect of a novel quenching and partitioning process at different annealing temperatures in two-phase region on microstructure of a low carbon Si-Mn steel was investigated by using a thermo-meehanical simulator CCT-AY-Ⅱ, XRD, SEM and TEM. The results show that the mierostructure of the low carbon Si-Mn steel consists of lath martensite, ferrite and retained austenite by Q&P process. Film retained austenite between lath martensite and bulk retained austenite at prior-austenite grain boundaries is observed. The steel after Q&P process possess a good combination of strength and plasticity due to its fine mierostructure. It exhibits high ultimate tensile strength exceeding 1000 MPa and fine elongation of 23%. The retained austenite with volume fraction up to 11% plays a role of transtormation-induced plasticity.
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