Experimental Study About the Effect of Heating Power of Spot Induction Hardening on Material Properties of 42CrMo

Cheng, Ming; Wang, Z.; Qin, Xunpeng; Gao, Kai; Wang, Y.

doi:10.1142/9789813207301_0026

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“…The material of 42CrMo steel (GB/T 3077), equivalent to EN 42CrMo4 steel or AISI 4140 steel according to their chemical composition [1], is an ultra-high strength structural alloy steel containing medium carbon content and low alloy content with good combination of strength and toughness, high hardenability and high-temperature strength [2]. due to its good mechanical properties along with low cost, the steel is widely used in the application of conical picks in China mining industry based on field research, as well as drive gears, main spindle, plastic mold and other key parts [3].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Zhang

Yan

Chen

et al. 2021

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EffEct of cryogEnic trEatmEnt on WEar rEsistancE and microstructurE of 42crmo stEEl in this work, thermo-mechanically treated 42CrMo steel was subjected to cryogenic treatment conducted by means of orthogonal design method, followed by low-temperature tempering to investigate the effect of different parameters of cryogenic treatment on wear resistance of 42CrMo steel and to optimize parameters of cryogenic treatment for improving wear resistance. The results of hardness test and wear test show that cryogenic treatment significantly improves wear resistance with marginal changes in coefficient of friction and hardness. Specifically, cryogenic temperature has the largest impact on wear resistance of 42CrMo steel, holding time has medium impact, and the parameter of treatment cycles has the least impact. The optimum parameters of cryogenic treatment are −196°C for 12 hours with one cycle for improving wear resistance. The results of scanning electron microscopy (SEM) and X-ray diffractometry (XRD) analysis indicate that marginal changes in hardness and coefficient of friction may be owing to little amount of transformation of retained austenite, and the significant influence of cryogenic treatment on improving wear resistance of 42CrMo steel can be mainly attributed to segregation of carbon atoms promoted by cryogenic treatment resulting in more precipitation of carbides in subsequent tempering.

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Section: Introductionmentioning

confidence: 99%