Effect of salt bath nitriding treatment on microstructure and properties of FeCrMnNiAl0.2Ti0.1 high entropy alloy

doi:10.13251/j.issn.0254-6051.2022.12.008

Abstract

Abstract: Chemical heat treatment method of salt bath nitriding was used to strengthen the surface of FeCrMnNiAl_0.2Ti_0.1high entropy alloy, and the main process was preheating + salt bath nitriding + oxidation. The effect of nitriding temperature on infiltration layer and properties of the alloy was studied. The microstructure and phases of the tested alloy at different nitriding temperatures were studied by metallographic microscope, scanning electron microscope and X-ray diffractometer. The hardness and wear resistance of the alloy were measured by microhardness tester and W-2000 friction and wear tester, respectively. The results show that after salt bath nitriding, a composite nitrided layer containing nitride and oxide is formed on the surface of the alloy. The highest depth of nitrided layer is 27.1 μm and the hardness can reach 1080.0 HV0.2. Salt bath nitriding can effectively enhance wear resistance of the high entropy alloy and improve the tribological behavior. The wear rate of the nitrided specimen at 640 ℃ is only 0.025 mm³/(N·m), which is about 76.7% lower than that of the as-cast specimen.

Key words: FeCrMnNiAl_0.2Ti_0.1 high entropy alloy, salt bath nitriding, microstructure, wear resistance, hardness

CLC Number:

TG156.8⁺2

Liu Yi, Gan Zhanghua, Wu Chuandong, Ni Qian, Wang Jiamin. Effect of salt bath nitriding treatment on microstructure and properties of FeCrMnNiAl_0.2Ti_0.1 high entropy alloy[J]. Heat Treatment of Metals, 2022, 47(12): 49-55.

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Effect of salt bath nitriding treatment on microstructure and properties of FeCrMnNiAl_0.2Ti_0.1 high entropy alloy

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