Transactions of Materials and Heat Treatment

Title：Research on precision forging process and microstructure of automobile hollow semi-axle

Authors： Zhou Zhiming Liu Bing Luo Tianxing Huang Weijiu Wang Hongchuan Luo Rong Fan Hongshan

Unit： Chongqing University of Technology Key Laboratory of the Chongqing Key Chongqing Jianshe Industry Co. Ltd.

KeyWords： hollow semi-axle precision forging microstructure

ClassificationCode：TG316

year,vol(issue):pagenumber：2016,41(3):9-12

Abstract：

The precision forging process step and microstructure of hollow semi-axle of the steel 25CrMo4 automobile were investigated. The results show that the material of automobile hollow semi-axle flows reasonably after forming by precision rotary forging technology，both inner and outer surfaces are relatively smooth with a smooth transition of changing diameter，and there is no folding phenomenon. Compared with the traditional automobile solid semi-axle, each workpiece can save about 30% of the raw materials. After the workpiece is formed by precision rotary forging, distortions of grains occur on the cross section, and longitudinal grains deform to fibrous. Then, after heat treatment, the surface of hollow semi-axle obtains tempered martensite and granular carbide，but the heart is lath martensite. Therefore, the surface of the workpiece is of high hardness and good wear resistance, and its center section is of high strength and toughness. Finally, the low load fatigue, high load fatigue and static torsional strength and other properties of hollow semi-axle can reach the requirements of automobile semi-axes after testing.

Funds：

重庆市科委攻关项目（cstc2014yykfB60004）;重庆市巴南区科技项目（2015TJ08）；重庆市模具技术重点实验室开放基金（2015TD19）

周志明（1976-），男，博士，教授

Reference：

［1］梁益龙,王新,孟阳，等.国产EA4T车轴钢的显微组织与强韧性研究[J].热加工工艺，2008,37(16):23-25.Liang Y L, Wang X, Meng Y，et al. Research on microstructure and obdurability of domestic axles steel EA4T [J]. Hot Working Technology, 2008,37(16):23-25.
［2］石塚弘道,蔡千华.高频淬火车轴[J]. 国外机车车辆工艺,2006，(5):13-15.Shizuka Hiromichi, Cai Q H. High frequency quenching train shaft[J]. Foreign Locomotive & Rolling Stock Technology,2006(5):13-15.
［3］张海霞,郑桂芸.汽车半轴用合金结构钢的研究与开发[J].莱钢科技,2009,(8):47-49.Zhang H X, Zheng G Y. Research and development of alloy structure steel for automobile semi-axis[J]. Laiwu Steel Technology,2009,(8):47-49.
［4］傅成骏,李芷慧,朱瑾陶，等.EA4T车轴钢热处理冷却转变特性的研究[J].机车车辆工艺, 2009,(3):8-11.Fu C J, Li Z H, Zhu J T, et al. Research on heat treatment cooling transformation characteristics of axles steel EA4T[J]. Locomotive & Rolling Stock Technology,2009,(3):8-11.
［5］高文贵，卢曦，秦文瑜，等.轿车传动半轴含芯棒旋锻工艺中的关键参数[J].塑性工程学报, 2014, 21(5): 57-64. Gao W G, Lu X, Qin W Y, et al. Study on the key parameters of MTS manufactured by rotary swaging process with mandrel[J]. Journal of Plasticity Engineering,2014, 21(5): 57-64.
［6］陈俊丹,莫文林,王培，等.回火温度对42CrMo钢冲击韧性的影响[J].金属学报,2012,48(10):1186-1193.Chen J D, Mo W L, Wang P，et al. Effects of tempering temperature on the impact toughness of steel 42CrMo[J]. Acta Metallurgica Sinica, 2012,48(10): 1186-1193.
［7］边书.高铁用25CrMo车轴钢淬透性的研究[D].沈阳：沈阳理工大学，2012.Bian S. Research on Hardanability of 25CrMo4 Axle Steel Used in High-Speed Rail[D]. Shengyang: Shenyang Ligong University, 2012.
［8］潘建成.高速列车轴用无缝钢管的轧制及轴的热处理工艺研究[D].重庆：重庆大学，2007. Pan J C. Study on Heat Treatment craft of High Speed Train Axle and Rolling of Seamless Steel Pipe Used for Axle [D]. Chongqing: Chongqing University, 2007.

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