Lower Temperature Plasma Nitriding without White Layer for 38CrMoAl Hydraulic Plunger

doi:10.3901/JME.2017.22.081

Abstract

Abstract: Lower temperature plasma nitriding is conducted for 38CrMoAl hydraulic plunger in this research. Optical microscopy (OM),X-ray diffraction(XRD) and micro-hardness and wear tester are used to investigate the microstructure,surface hardness,brittleness of modified layer and wear resistance. The results show that no white bright layer is formed while plasma nitriding at 450℃ for 6 h,and XRD also confirm that there existed no γ'-Fe₄N phase. Meanwhile,the brittleness is decreased at lower temperature plasma nitriding comparing with conventional plasma nitriding,there existed no crack around the indentation for samples plasma nitriding at 450℃. Meanwhile,the wear resistance of samples plasma nitrided at 450℃ is higher than that of the conventional plasma nitrided samples and meet the requirements.

Key words: 38CrMoAl, hydraulic plunger, plasma nitriding, white layer

CLC Number:

TG156

CHEN Yao, SONG Lei, ZHANG Chenkai, YE Xuemei, HU Jing. Lower Temperature Plasma Nitriding without White Layer for 38CrMoAl Hydraulic Plunger[J]. Journal of Mechanical Engineering, 2017, 53(22): 81-86.

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