淬火-配分-回火（QPT）钢的研究进展-中国材料进展

文章信息/Info

Author(s):: LI Yu; LI Wei; JIN Xuejun; (School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Keywords:: quenching-partitioning-tempering(QPT) process; mechanical properties; microstructure evolution; toughness; hydrogen embrittlement

摘要:: 针对先进高强钢研究中提出的淬火-配分-回火（QPT）工艺，从热处理、组织演变和碳配分过程综合介绍了高强QPT钢的研究进展，并从力学性能优化出发总结其基于微观组织调控的强韧化机制。基于上述强韧化机制，提出了高强QPT钢的优选的理想组织为几百纳米级的条状马氏体与薄膜状残余奥氏体，并以此为基体弥散析出细小的纳米级碳化物。研究人员在对低碳、中碳及高碳微合金钢进行QPT制备研究的基础上，也对新型QPT工艺及高强QPT钢的氢脆问题进行了探索，旨在使先进高强钢获得优异的强度、塑性、韧性和抗氢脆综合性能。对此最新进展进行了总结，并探讨了QPT钢基础研究和应用研究的重点方向。

Abstract:: In view of the quenchingpartitioningtempering (QPT) process proposed in the development of advanced high strength steel, a review of high strength QPT steel is conducted from three aspects: heat treatment, microstructure evolution and carbon partitioning process. The strengthening and toughening mechanism based on microstructure regulation is summarized from the optimization of mechanical properties. It is proposed that the optimum microstructure of ultra-high strength QPT steel consist of filmy retained austenite and lath martensite with a thickness of hundreds of nanometers, and dispersed nanosized carbides in the matrix. Moreover, QPT procedure is not only limited in low/medium- and high-carbon microalloyed steels, new QPT process and hydrogen embrittlement (HE) are investigated to design QPT steels with comprehensive strength, ductility, toughness and HE resistance. This work summarizes the newest approaches in QPT steels and discusses the foundation and application research trends of QPT procedure.