Effect of cryogenic treatment on hardness, wear resistance and impact property of conical pick and its optimization

doi:10.13251/j.issn.0254-6051.2022.12.014

Abstract

Abstract: A new process of brazing-heat treatment-cryogenic treatment was proposed by introducing cryogenic treatment technology into the traditional brazing-heat treatment process of conical pick. The cryogenic treatment test scheme was designed by using the full factor method with the cryogenic temperature and time as the main process parameters, and the wear resistance of conical pick were tested by cutting rock test, along with determination of the impact toughness of pick body and the hardness of pick head and pick body, so as to study the influence of cryogenic treatment on the hardness, wear resistance and impact toughness of conical pick, finally getting the optimal cryogenic treatment process. The results show that the cryogenic treatment has no significant effect on the hardness of conical pick and a slight adverse effect on the impact toughness of conical pick, but it can significantly enhance the wear resistance of conical pick, which is beneficial to prolong the service life of conical pick. The optimal cryogenic treatment process is cryogenic temperature -196 ℃ and cryogenic time 12 h, in which the comprehensive performance is the best. At this time, the impact absorbed energy is only reduced by 1.2 J, while the wear resistance is increased by 41.6%.

Key words: conical pick, cryogenic treatment, full factor design, wear resistance, impact property

CLC Number:

TG156.91

Zhang Haidong, Yan Xianguo, Dong Liang, Zhang Jie, Zhao Xuewen. Effect of cryogenic treatment on hardness, wear resistance and impact property of conical pick and its optimization[J]. Heat Treatment of Metals, 2022, 47(12): 84-89.

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