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采用双相区保温淬火(I&Q)和双相区保温+奥氏体化淬火(I&P&Q)工艺和直接淬火(DQ)工艺,结合热力学计算,研究了低碳硅锰钢热处理过程中Mn配分行为及其对组织演变和力学性能的影响机制。结果表明:经I&Q工艺处理,Mn在室温马氏体中出现了明显富集,马氏体以条状、块状、团状三种形态分布,化学位梯度驱使着Mn由铁素体向奥氏体中配分,Mn在晶界处的配分行为影响着晶界的迁移方向,使得形成不同形态的奥氏体晶粒;I&P&Q工艺处理后Mn在马氏体中呈不均匀分布,较DQ工艺,I&P&Q工艺使钢的伸长率由5.2%提高到10.9%,强塑积提高了6812 MPa·%。
Based on the thermodynamic calculation and the I & Q and I & P & Q processes and the direct quenching (DQ) process, the characteristics of Mn partitioning during the heat treatment of low-carbon Si- Its impact on organizational evolution and mechanical properties. The results show that Mn is obviously enriched in martensite at room temperature after I & Q process treatment. The martensite distributes in the form of strips, lumps and clumps. The chemical gradients drive Mn from ferrite to austenite The distribution of Mn in the grain boundary affects the migration direction of the grain boundaries, resulting in the formation of austenite grains with different morphologies. Mn is unevenly distributed in the martensite after the I & P & Q process. Compared with the DQ process , The I & P & Q process increased the elongation of steel from 5.2% to 10.9%, and the strong plastic product increased 6812 MPa ·%.