汽车用超高强QP钢的工艺与组织性能研究

发布时间：2018-05-30 03:18

本文选题：汽车用钢 + 淬火　；参考：《机械工程学报》2017年12期

【摘要】：介绍以简单成分C-Si-Mn及其Nb,Ti微合金化为特点的第三代汽车用钢淬火配分(Quenchingpartioning,QP)钢的研究结果,包括:不同配分温度和配分时间等配分条件对QP钢组织性能的影响,淬火和在贝氏体区配分QP-B条件对QP钢组织性能的影响,以及配分条件对QP钢的加工硬化行为和烘烤硬化性能的影响规律等。结果表明,微合金化可有效减小原始奥氏体晶粒尺寸;采用淬火并在贝氏体区配分(Quenching and partitioning in bainite zone,QP-B)的热处理工艺可得到M+B+γ三相组织及7.81%的较高奥氏体体积分数,强塑积可达到31.6 GPa·%;QP钢具有的优异加工硬化性能与组织中的残余奥氏体含量密切相关,残余奥氏体含量可以通过优化配分工艺调整;简单成分QP钢(0.24C-1.5Si-2.1Mn-0.05Nb)的烘烤硬化值随配分温度及配分时间的增加从80 MPa降低到30 MPa左右。
[Abstract]:This paper introduces the research results of the third generation automobile steel quenched and partitioned QP steel characterized by simple composition C-Si-Mn and its NB Ti microalloying, including the effects of different partition temperature and partition time on the microstructure and properties of QP steel. The effects of quenching and bainite partition QP-B conditions on the microstructure and properties of QP steel, and the effect of the partition conditions on the work hardening behavior and bake hardening properties of QP steel were investigated. The results show that the grain size of primary austenite can be reduced effectively by microalloying, and the phase structure of M-B 纬 and high austenite volume fraction of 7.81% can be obtained by means of quenching and heat treatment of Quenching and partitioning in bainite zonetin QP-B in the bainite region. The excellent working-hardening property of 31.6 GPa / QP steel is closely related to the content of retained austenite in the microstructure, and the content of residual austenite can be adjusted by optimizing the partition process. The baking hardening value of QP steel 0.24C-1.5Si-2.1Mn-0.05Nb decreased from 80 MPa to 30 MPa with the increase of partition temperature and time.
【作者单位】：北京科技大学材料科学与工程学院;北京科技大学材料先进制备技术教育部重点实验室;
【基金】：国家自然科学基金资助项目(U1460101)
【分类号】：TG142.1;TG161

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