Transactions of Materials and Heat Treatment

Title：Analysis on mechanical properties and mechanical model of performance layer for high speed cold roll-beating spline

Authors： Niu Ting Li Yongtang

Unit： Taiyuan University of Science and Technology Shanxi Key Laboratory of Metal Forming Theory and Technology

KeyWords： high speed cold roll-beating spline nanoindentation microhardness elastic modulus wear resistance mechanical model

ClassificationCode：TG315.79

year,vol(issue):pagenumber：2018,43(2):0-0

Abstract：

The distribution of mechanical performance and the related mechanical model of high speed cold roll-beating spline were studied. Based on the existing researches, the region of performance layer for spline was determined, and regions of test points were determined. Then, the nanoindentation tests were conducted by nanoindentation technique, and the load displacement curves, microhardness distribution curves and elastic modulus distribution curves were obtained. Furthermore, the wear resistance of performance layer was studied by analyzing the ratio of microhardness and elastic modulus. The results show that the microhardness increases from 15.83% to 36.11% from the tooth top to the tooth roof away from the spline surface of 80 μm, and the ratio of microhardness and elastic modulus increases from 20.50% to 31.88%. However, the performance layer belongs to a spatial gradient performance layer, which is along the tooth top, the tooth flank to the tooth root and along the spline surface to the core. In addition, the mechanical models of loading displacement curve and the microhardness are obtained, which is closely related to the microstructure.

Funds：

国家自然科学基金资助项目（51475316）；山西省重点学科建设经费资助

作者简介：牛婷（1986-），女，博士研究生 E-mail：niuting861010@163.com 通讯作者：李永堂（1957-），男，博士，教授 E-mail：liyongtang@tyust.edu.cn

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