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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-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1000 MPa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。
The effect of quenching and carbon redistribution heat treatment process with different annealing temperature on the microstructure and fine structure of low carbon Si-Mn Q & P steel in a two-phase region was investigated and compared with the Q & P heat treatment process with austenite annealing Compared. SEM and TEM analysis showed that the Q & P process annealing in two-phase region was lath martensite, ferrite and film-like retained austenite at room temperature. Retained austenite exists in two forms: a thin film between the martensite laths and a lump at the original austenite grain boundaries. The Q & P steel after heat treatment in the two-phase zone not only has a tensile strength of more than 1000 MPa, but also an elongation of more than 23%. Residual austenite with a volume fraction of as high as 11% plays a role of phase transformation induced plasticity.