冷却介质对40Cr钢汽车前轴淬火过程组织演变及变形行为的影响  

Effect of cooling medium on microstructure evolution and deformation behavior of 40Cr steel automobile front axle during quenching

作　　者：董成通 吴博雅 冯思远 王孝文[3] 黎军顽[1,2] DONG Cheng-tong;WU Bo-ya;FENG Si-yuan;WANG Xiao-wen;LI Jun-wan(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;State Key Laboratory of Advanced Special Steel,Shanghai 200444,China;School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]高品质特殊钢冶金与制备国家重点实验室,上海200444 [3]武汉理工大学汽车工程学院,湖北武汉430070

出　　处：《材料热处理学报》2022年第9期121-130,共10页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划“高性能工模具钢及应用”(2016YFB0300400,2016YFB0300404)。

摘　　要：使用数值仿真的方法对40Cr钢汽车前轴淬火时组织场的演变和变形行为进行定量表征,通过构建多物理场耦合模型,分析了汽车前轴在不同冷却介质下进行淬火时组织场的变化规律,讨论了冷却介质对其变形行为的影响。结果表明:使用15%浓度的聚烷二醇聚合物(PAG)作为冷却介质,汽车前轴淬火后平均硬度约为44.65 HRC,轴头平均变形量约为0.122 mm,优于使用油和水冷却,这是由于全奥氏体化前轴在PAG溶液里形成的蒸汽膜随冷却时间延长而变厚,最后只能通过对流传热,致使高温冷却较快而低温冷却较慢,得到淬透性好、变形量较小的汽车前轴。The evolution of microstructure field and deformation behavior of 40Cr steel automobile front axle during quenching were quantitatively characterized by numerical simulation.By constructing a multi physical field coupling model,the variation law of microstructure field of automobile front axle during quenching with different cooling medium was analyzed,and the influence of cooling medium on its deformation behavior was discussed.The results show that using 15%concentration polyalkylene glyeol(PAG)as the cooling medium,the average hardness of the automobile front axle after quenching is about 44.65 HRC,and the average deformation of the axle head is about 0.122 mm,which is better than using oil and water cooling.This is because the steam film formed by the fully austenitized front axle in PAG solution thickens with the increase of cooling time.Finally,it can only be cooled through convective heat transfer,resulting in faster high-temperature cooling and slower low-temperature cooling,and the automobile front axle with good hardenability and small deformation is obtained.

关 键 词：前轴 淬火 冷却介质 组织演变 变形 

分 类 号：TG142.3[一般工业技术—材料科学与工程]