980 MPa级热浸镀钢的新型淬火配分工艺及组织性能  

Novel Q&P process,microstructure and mechanical properties of a 980 MPa grade hot-dip galvanized steel

作　　者：王开泰 许云波[1] 徐兵 顾兴利 王源 李佳彧 倪申亚 龚殿尧[1] Wang Kaitai;Xu Yunbo;Xu Bing;Gu Xingli;Wang Yuan;Li Jiayu;Ni Shenya;Gong Dianyao(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang Liaoning 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《金属热处理》2021年第11期143-147,共5页Heat Treatment of Metals

基　　金：国家重点研发计划(2017YFB0304105,2017YFB0304400);国家自然科学基金(51974085,51674080);山东省重点研发计划(2019TSLH0103)。

摘　　要：针对980 MPa级热浸镀钢,在C-Mn-Si-Al系成分设计基础上,开发了一种以高淬火温度(Ms点以上)为特征的新型淬火配分工艺(High-quenching-temperature quenching and partitioning,HQ&P),并与传统的一步过时效工艺(Quenching and austempering,QAT)相比较,分析不同热处理工艺下的组织结构与力学性能变化规律。试验结果表明,试验钢组织为临界区铁素体、贝氏体和马奥岛复相结构。一步过时效工艺下,随退火温度的增加,铁素体含量逐渐减少,贝氏体含量逐渐增加;高温淬火后配分处理的两步工艺下,试验钢发生了两次贝氏体转变,最终贝氏体含量更高,组织更加均匀且含有少量的残留奥氏体。在HQ&P工艺下,试验钢获得最佳的力学性能,即抗拉强度1005 MPa,伸长率26.1%。A novel high-quenching-temperature quenching and partitioning(HQ&P)process was proposed to investigate the microstructure and mechanical properties of a 980 MPa grade C-Mn-Si-Al hot-dip galvanized steel by comparison with the conventional quenching and austempering(QAT)process.The results show that the desired duplex microstructure consisting of blocky ferrite,bainite,and some M/A islands is achieved in the tested steel.With the increase of annealing temperature during QAT process,the content of ferrite gradually decreases while the content of bainite increases.During the HQ&P process,the bainitic transformation occurs twice,which results in a more uniform microstructure with more bainite and a small amount of retained austenite.The best mechanical properties of the tested steel treated by HQ&P process are obtained with the tensile strength of 1005 MPa and the elongation of 26.1%.

关 键 词：热浸镀钢 膨胀曲线 淬火配分工艺 贝氏体转变 微观组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]