Optimization of carburizing and quenching process for 20MnCr5 steel inner star wheel

doi:10.13251/j.issn.0254-6051.2024.07.032

Abstract

Abstract: In order to improve the surface hardness and wear resistance of inner star wheel and ensure the toughness of the core, the carburizing and quenching process of 20MnCr5 steel inner star wheel was optimized. The results show that the hardness and the depth of effective hardening layer of the 20MnCr5 steel inner star wheel meet the technical requirements after (935±10) ℃×295 min+830 ℃×30 min carburizing and quenching with diffusion carbon potential of 0.75%, quenching carbon potential of 0.65%, and the oil cooling stirring speed of 1100 r/min. After 400 cycles life test, wear and peeling appear on the surface of the inner star wheel treated by the original carburizing and quenching, while only slight scratches appear on the surface of the inner star wheel treated by optimized carburizing and quenching. The wear resistance is significantly improved compared to the original carburizing and quenching.

Key words: inner star wheel, carburizing and quenching process, hardness, wear resistance

CLC Number:

TG156.8⁺1

Ding Zhong, Meng Xianggang, Li Xiaotian, Gu Jiacheng, Xu Jie. Optimization of carburizing and quenching process for 20MnCr5 steel inner star wheel[J]. Heat Treatment of Metals, 2024, 49(7): 208-211.

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