Effect of cryogenic treatment on microstructure and wear resistance of alloy cast iron

doi:10.13251/j.issn.0254-6051.2021.07.032

Abstract

Abstract: Effect of cryogenic treatment on microstructure and wear resistance of an alloy cast iron after quenching and tempering was studied by means of OM, SEM, XRD and friction test. The results show that the graphite morphology of the alloy cast iron before and after cryogenic treatment is mainly type A, and the grade is 5. After the cryogenic treatment, ultrafine carbides are precipitated on the martensite grain boundary, and the volume fraction of retained austenite is reduced from 19.6% to 14.8%, which increases the hardness of the alloy cast iron by 3 HRC. The average thermal expansion coefficient of the alloy cast iron at 25-100 ℃ is reduced from 13.34×10^-6 K^-1 to 10.97×10^-6 K^-1, and with the increase of temperature, the performance stability of the material is better. Under the conditions of same working and oil lubrication, the wear volume and friction coefficient of the cryogenic treated alloy cast iron are smaller than that without the treatment.

Key words: compressor, roller, alloy cast iron, cryogenic treatment, thermal expansion coefficient, wear volume

CLC Number:

TG156

Hu Wenxiang, Li Jianxin, Shi Zhengliang, Xu Jia, Guan Yunqi, Ding Shaopeng. Effect of cryogenic treatment on microstructure and wear resistance of alloy cast iron[J]. Heat Treatment of Metals, 2021, 46(7): 168-172.

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