汽车曲轴用非调质钢C38+N的热变形行为研究  

Research on Hot Deformation Behavior of Non-quenched and Tempered Steel C38+N for Automobile Crankshaft

作　　者：孙鹤 刘雅政[2] SUN He;LIU Yazheng(China Steel Group Co.,Ltd.,Beijing 100080,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国中钢集团有限公司,北京100080 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《热加工工艺》2023年第24期52-58,共7页Hot Working Technology

摘　　要：以重型汽车曲轴用C38+N非调质钢为对象,对其热变形行为开展实验研究。对C38+N钢在850~1250℃保温不同时间时的奥氏体晶粒长大行为进行研究。得出模铸轧材和连铸轧材C38+N钢奥氏体晶粒长大激活能分别为7.49×10^(4)J/mol、7.87×10^(4)J/mol。计算并建立了不同实验状态下的奥氏体晶粒长大模型,分析了C38+N钢模铸轧材、连铸轧材奥氏体晶粒长大行为差异的原因是连铸轧材比模铸轧材的MnS分布更加弥散,MnS对奥氏体晶界有钉扎作用。Taking C38+N non-quenched and tempered steel for heavy-duty vehicle crankshafts as the object,the thermal deformation behavior of the steel was studied experimentally.The austenite grain growth behavior of C38+N steel when held at 850-1250℃for different time was studied.It is concluded that the activation energy of austenite grain growth of model-casting rolling material and continuous casting-rolling material C38+N steel is 7.49×10^(4)J/mol and 7.87×10^(4)J/mol,respectively.The austenite grain growth models under different experimental conditions were calculated and established.The reason for the difference in the austenite grain growth behavior of C38+N steel model-casting-rolling material and continuous-casting-rolling material is that the MnS distribution of continuous-casting-rolling material is more dispersed than that of model-casting-rolling material,and MnS has a pinning effect on austenite grain boundaries.

关 键 词：非调质钢 热变形行为 奥氏体晶粒 

分 类 号：TG301[金属学及工艺—金属压力加工]