Effect of liquid phase plasma carbonitriding time on microstructure and properties of infiltration layer of H13 hot work die steel

doi:10.13251/j.issn.0254-6051.2023.09.017

Abstract

Abstract: In order to improve high temperature oxidation resistance and hardness of H13 hot work die steel, the liquid phase plasma electrolytic carbonitriding technology was used to treat the H13 hot work die steel. The microstructure, composition, hardness and high temperature oxidation resistance of infiltration layer of the hot work die steel were tested by means of XRD, SEM and Vickers hardness tester, and the effect of carbonitriding time on microstructrue and properties of the infiltration layer was investigated. The results show that iron carbides and nitrides are formed on surface of the H13 hot work die steel after liquid phase plasma carbonitriding for 3, 5 and 7 min respectively at 200 V voltage. The phase composition of the infiltration layer includes Fe, Fe₁₉Mn, CrFe₄, Fe₃C and Fe_2-3N. With the extension of carbonitriding time, the molten particles gather more and more, which produces a “hillside” shape, making its surface more rough, and the thickness of the infiltration layer also increases. When the carbonitriding time is 7 min, the thickness of the infiltration layer is the largest, about 5.9 μm. The microhardness increases with the increase of carbonitriding time. The microhardness of the infiltrated layer after carbonitriding for 7 min is the highest, reaching 403.13 HV0.2. The high temperature oxidation resistance of the H13 hot work die steel is significantly improved after liquid phase plasma electrolytic carbonitriding.

Key words: H13 hot work die steel, liquid plasma electrolysis, carbonitriding, high temperature oxidation resistance

CLC Number:

TG156.82

Fan Xingping, Fan Wei, Xie Wen. Effect of liquid phase plasma carbonitriding time on microstructure and properties of infiltration layer of H13 hot work die steel[J]. Heat Treatment of Metals, 2023, 48(9): 99-105.

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