Microstructure and Mechanical Properties Analysis of the Special Steel Flexspline for Harmonic Reduction Gear
ZHANG Chaolei1, WEI Yang1, FANG Wen1, MIAO Hongsheng2, BA Xinyu1, LIU Yazheng1
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083; 2 Qinghai Special Steel Engineering Technology Research Center, Xining Special Steel Co., Ltd., Xining 810005
Abstract: Microstructure and mechanical properties of the domestic and foreign special steel flexsplines for harmonic reduction gear were comparatively analyzed by alloys composition, quantitative analysis of microstructure, determination of mechanical properties at room temperature and fracture analysis. The results showed that the difference in composition was in the design of V-Ti-Nb microalloys. Microstructure of the domestic flexspline was coarse, and it had poor stability. Its prior-austenite grain was 1.0-4.0 grade smaller than Japan’s, and the fluctuation of grain size reached 3.0 grade. Strength of the foreign flexspline at different positions was in good agreement, and strength and plasticity of the domestic and foreign flexsplines were basically the same. But mecha-nical properties stability of the domestic was poor. Insufficient cleanliness, Al2O3 brittle inclusions with diameter of 3.0-6.0 μm, coarse and uneven structure were the main causes of short life and stability fatigue resistance for the domestic flexspline.
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2018, Vol. 32 
