Effect of quenching process on impact property of carburized 18Cr2Ni4WA steel shearer walking wheel

doi:10.13251/j.issn.0254-6051.2025.03.011

Abstract

Abstract: The effect of quenching process on impact property of the carburized 18Cr2Ni4WA steel shearer walking wheels was investigated. After carburizing heat treatment, the 18Cr2Ni4WA steel shearer walking wheels were oil-quenched at 780, 800 and 830 ℃, respectively, and finally cryogenic treated at -60 ℃ for 2 h, then tempered at 180 ℃ for 15 h. After the heat treatment, the mechanical properties and microstructure of the specimens were tested. The results show that the hardness of the core of the walking wheel is significantly reduced, while the impact property of the core is greatly improved when the quenching temperature is reduced. By adopting intercritical quenching process, when the quenching temperature is 780 ℃, the shearer walking wheel can meet the surface hardness requirements and improve the impact property of the core, and the microstructure is composed of lath martensite, bainite, ferrite and retained austenite, and the impact property of the core is greatly improved with impact absorbed energy of 108 J, achieving the improvement of the core of the impact property of the carburized and quenched walking wheel.

Key words: 18Cr2Ni4WA steel, walking wheel, carburizing, intercritical quenching, impact property

CLC Number:

TG156.31

He Xiao, Xu Hongxiang, Shi Lubing, Zhao Shaofu, Rong Zeyu, Guan He, Chen Zhi. Effect of quenching process on impact property of carburized 18Cr2Ni4WA steel shearer walking wheel[J]. Heat Treatment of Metals, 2025, 50(3): 69-73.

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