Effect of Cryogenic Treatment on the Microstructure and Wear Resistance of 17Cr2Ni2MoVNb Carburizing Gear Steel

Coatings

Yongming Yan¹  Maoqiu Wang¹  Chen Zhang²  Ke Liu²  Xinming Wang³  Zixiang Luo³ 

[1] Central Iron & Steel Research Institute Company Limited, Beijing 100081, China;Jianglu Machinery and Electronics Group Co., Ltd., Xiangtan 411100, China;School of Material Science and Engineering, Xiangtan University, Xiangtan 411105, China;

关键词: cryogenic treatment;    17Cr2Ni2MoVNb;    wear;    gear steel;    carbide;    retained austenite;   

DOI  :  10.3390/coatings12020281

来源: DOAJ

【 摘 要 】

Cryogenic treatment as a process that can effectively improve the performance of steel materials is widely used because of its simplicity and speed. This paper investigates the effects of different low temperature treatments on the microstructure and properties of 17Cr2Ni2MoVNb steel. The low temperature treatment range is divided into cryogenic treatment (CT-80), shallow cryogenic treatment (SCT-150) and deep cryogenic treatment (DCT-196), all with a duration of 1 h. The retained austenite content and the change in carbide volume fraction at 0.2 mm in the carburised layer are studied. The microhardness gradient of the carburised layer, as well as the friction coefficient and wear scar morphology at 0.2 mm, was investigated. The results show that the low temperature treatment is effective in reducing the retained austenite content and increasing the volume fraction of carbide. The lowest retained austenite content and highest carbide volume fraction were obtained for DCT-196 specimens at the same holding time. Due to the further transformation of martensite and the diffuse distribution of carbides, the microhardness and frictional wear properties of DCT-196 are optimal. Therefore, low temperature treatment can change the microstructure of the case layer of 17Cr2Ni2MoVNb steel and effectively improve the mechanical properties of materials.

【 授权许可】

Unknown