贝氏体钢等温淬火和淬火-配分复合工艺  

Integrated austempering and quenching-partitioning process of a bainitic steel

作　　者：刘曼 胡海江[1] 田俊羽 陈光辉 徐光[1] LIU Man;HU Hai-jiang;TIAN Jun-yu;CHEN Guang-hui;XU Guang(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《钢铁》2021年第1期69-74,90,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51874216,51874216);湖北省科技创新重大专项资助项目(2017AAA116)。

摘　　要：为了研究等温淬火和淬火-配分复合工艺对中碳高强贝氏体钢组织和力学性能的影响,采用组织观察、热模拟试验、X射线衍射分析和拉伸试验等手段,阐明等温淬火和淬火-配分复合工艺处理下的组织演变和性能变化。结果表明,等温淬火结合淬火-配分工艺可以细化粗大的块状马氏体/奥氏体岛,将粗大的马奥岛组织转化为薄膜状奥氏体和贫碳马氏体。与单独贝氏体相变或单独淬火-配分处理工艺相比,等温淬火结合淬火-配分复合工艺提高了中碳钢的力学性能。此外,与单独贝氏体相变或淬火-配分工艺相比,通过等温淬火和淬火-配分复合工艺可以获得更多碳含量较高的残余奥氏体。In order to investigate the effect of integrated austempering and Q&P(quenehing and partitioning)process on microstructure and mechanical properties of a medium-carbon high-strength bainitic steel,the microstructural observation,dilatometry,X-rays diffraction and tensile tests were utilized to clarify the microstructural evolution and property changes treated by integrated austempering and Q&P process.Results demonstrate that the integrated austempering and Q&P process can refine the blocky M/A islands and the coarse blocky M/A islands can be successfully converted to filmy austenite and carbon-depleted martensite plates.In addition,mechanical properties are enhanced by integrated austempering and Q&P process compared to that by austempering or Q&P process individually.Moreover,compared to austempering or Q&P process individually,more austenite with higher carbon content are retained through integrated austempering plus Q&P process.

关 键 词：等温淬火 淬火-配分工艺 块状马氏体/奥氏体岛 组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]