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设计了新的Q&P钢成分0.2C-1.6Si-3.5Mn,研究了提高锰含量之后Q&P钢的组织及性能。对这一成分的冷轧薄板进行了Q&P工艺热处理,测定了不同配分时间下的力学性能和残余奥氏体体积分数,并通过SEM和TEM观察了显微组织。结果表明,Q&P钢的抗拉强度达到1366～1476 MPa,伸长率为11.1%～15.8%。显微组织主要为高位错密度的板条状马氏体和分布其间的薄膜状残余奥氏体,配分时间过长会有一些碳化物析出。随配分时间的延长,残余奥氏体的体积分数逐渐增加,其中的碳含量也增多。
A new Q & P steel composition 0.2C-1.6Si-3.5Mn was designed. The microstructure and properties of Q & P steel after the manganese content was increased were studied. The cold rolled sheet of this component was subjected to Q & P heat treatment. The mechanical properties and the retained austenite volume fraction were measured at different partitioning time. The microstructure was observed by SEM and TEM. The results show that the tensile strength of Q & P steel reaches 1366 ~ 1476 MPa and the elongation is 11.1% ~ 15.8%. The microstructures are mainly lath martensite with high dislocation density and film-like residual austenite distributed between them. Some carbide precipitates when the partitioning time is too long. With the extension of time, retained austenite volume fraction gradually increased, of which the carbon content also increased.