配分时间对一步法淬火配分钢组织与性能的影响  

Effect of partitioning time on microstructure and properties of one-step quenched and partitioned steel

作　　者：王成 丁茹 刘亚军 童善康 甘晓龙[2] Wang Cheng;Ding Ru;Liu Yajun;Tong Shankang;Gan Xiaolong(Hot Rolling Plant,Wuhan Iron and Steel Co.,Ltd.,Wuhan Hubei 430080,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan Hubei 430081,China)

机构地区：[1]武汉钢铁有限公司热轧厂,湖北武汉430080 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《金属热处理》2025年第3期107-113,共7页Heat Treatment of Metals

基　　金：湖北省教育厅指导性项目(B2022010)。

摘　　要：基于一步法淬火配分(Q&P)工艺条件,通过万能拉伸机、扫描电镜、电子背散射衍射和X射线衍射仪等研究了配分时间(2,30 min)对一步法Q&P高强钢组织性能的影响。结果发现,当配分时间为2 min时,试验钢获得了优异的综合力学性能,屈服强度、抗拉强度和断裂总延伸率分别为965 MPa、1288 MPa和11.1%。随着配分时间的增加,马氏体中的位错密度增加,残留奥氏体含量减少。不同配分时间下试样屈服强度的差异主要归因于固溶强化、细晶强化和位错强化的强化增量不同,其中以细晶强化和位错强化贡献为主,屈服强度理论计算结果与试验结果相吻合。Based on the one-step quenching and partitioning(Q&P)process conditions,the effect of partitioning time(2,30 min)on the microstructure and properties of a tested one-step Q&P high-strength steel was studied by using universal tensile machine,scanning microscope,electron backscatter diffraction and X-ray diffractometer.The results show that the excellent comprehensive mechanical properties are obtained when the partitioning time is 2 min.The yield strength,tensile strength and percentage total extension at fracture are 965 MPa,1288 MPa and 11.1%,respectively.The dislocation density in martensite increases and the retained austenite content decreases as the partitioning time increases.The difference in yield strength of the specimens under different partitioning time is mainly attributed to the different strengthening increments of solution strengthening,fine grain strengthening and dislocation strengthening,among which fine grain strengthening and dislocation strengthening contributions are dominant.The theoretical yield strength calculation results are in agreement with the tested results.

关 键 词：一步法Q&P钢 配分时间 残留奥氏体 位错强化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]