Microstructure and wear resistance of oxynitriding layer on piston rod surface of 42CrMo steel

doi:10.13251/j.issn.0254-6051.2021.08.043

Abstract

Abstract: Surface modification and wear resistance of 42CrMo steel piston rod were studied by using gas oxynitriding composite process. The specimens treated by different surface processes were characterized and analyzed by means of metallographic analysis, microhardness test and dry friction and wear test. The results show that after gas oxynitriding treatment of the quenched and tempered 42CrMo steel for 8 h, at which the surface composed of oxide layer of 1-2 μm with Fe₃O₄ and compound layer of 18 μm with ε-Fe_2-3N and γ′-Fe₄N can be obtained. The effective modified thickness is about 340 μm. Under the same dry friction conditions, the wear mechanism of the specimens without treatment and with chromium plating treatment is abrasive wear accompanied by slight adhesive wear. After gas oxynitriding composite process, the specimen has the lowest average friction coefficient and wear rate, and the wear mechanism is abrasive wear, which has the best wear resistance.

Key words: 42CrMo steel, gas oxynitriding treatment, microhardness, wear resistance, abrasive wear

CLC Number:

TG156.8

Wang Zili, Chen Rongfa, Zheng Zhiwei, He Yulong, Shi Minjie, Wang Kai, Zhou Xiaojin. Microstructure and wear resistance of oxynitriding layer on piston rod surface of 42CrMo steel[J]. Heat Treatment of Metals, 2021, 46(8): 225-229.

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