添加Si对马氏体不锈钢淬火-配分组织和性能的影响. (Chinese)

In order to improve the strength-plasticity and corrosion resistance, two nitrogen-alloyed martensitic stainless steels 10Cr13N and 10Cr13Si2N with different Si contents were designed and fabricated. The experimental steels were subjected to a quenching-partitioning (Q&P) process with constant quenching finish temperature and partitioning temperature but changing partitioning time.The effect and mechanism of Si addition were investigated from the changes of microstructure and mechanical properties. The results show that lath martensite and retained austenite can be obtained through quenching and partitioning process, and its strength-plasticity is significantly higher than that of quenching and tempering. As the partitioning time prolongs, the volume fractions of retained austenite in microstructures of two steels increase to a maximum first and then decrease gradually, which has slight effect on strength, but significant effect on elongation. Increasing Si content in steel is beneficial to inhibit the precipitation of carbonitride in martensite and improve the volume fraction and stability of retained austenite, it can significantly improve the deformability of steel but reduce the impact toughness slightly. [ABSTRACT FROM AUTHOR]

为改善马氏体不锈钢的强塑性和耐蚀性，设计制备了Si含量不同的两种氮合金化马氏体不锈钢10Cr13N钢和10Cr13Si2N钢。对实验钢进行了改变配分时间但恒定淬火终止温度和配分温度的淬火-配分处理，从显微组织和力学性能的变化规律探究添加Si元素的作用与机理。结果表明：实验钢淬火-配分处理后得到板条马氏体加残余奥氏体为主的复相组织，其强塑性配合显著高于淬火-回火状态。随配分时间的延长，两种钢组织中残余奥氏体的含量呈现先上升后下降的极值规律，这一变化对强度影响不大，但对伸长率影响较为显著。增加钢中的Si含量，有利于抑制马氏体中碳氮化物析出并提高残余奥氏体含量和稳定性，在使钢的冲击韧性略微下降的同时可显著改善钢的变形能力。 [ABSTRACT FROM AUTHOR]

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