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对一种含Cu低碳硅锰钢分别采用I&Q、Q&P和I&Q&P热处理工艺,研究双相区Cu配分行为并分析其对马氏体组织形貌、残留奥氏体及力学性能的影响。结果表明,试验钢经I&Q工艺处理,在双相区保温时Cu元素从铁素体向奥氏体中配分,Cu配分明显,并且不影响C和Mn的配分效果。试验钢经I&Q&P工艺处理后,组织基本为板条马氏体,且马氏体板条清晰,部分板条有断裂的现象。与经Q&P工艺处理相比,试验钢经I&Q&P工艺处理后残留奥氏体体积分数显著提高,从9.6%提高到了13.2%。对比Q&P工艺,试验钢经I&Q&P工艺处理后,抗拉强度有一定降低,但伸长率大大提高,强塑积达到27 GPa·%。
A Cu-containing low-carbon Si-Mn steel with I & Q, Q & P and I & Q & P heat treatment process were used to study the Cu distribution in the dual-phase zone and analyze their effects on martensite morphology, retained austenite and mechanical properties. The results show that the treated steel is treated by I & Q process. The Cu element is distributed from ferrite to austenite in the two-phase zone while the Cu content is obvious, and does not affect the partition effect of C and Mn. After the test steel was treated by I & Q & P process, the basic structure was lath martensite, and the martensite lath was clear and some laths were broken. Compared with the Q & P process, the retained austenite volume fraction of the test steel increased significantly from 9.6% to 13.2% after I & Q & P process. Compared with the Q & P process, the tensile strength of the test steel after I & Q & P treatment decreased to a certain extent, but the elongation rate was greatly increased with a strong plastic product of 27 GPa ·%.