Effect of decreasing carbon and increasing nitrogen on microstructure and properties of quenched martensitic stainless steel

doi:10.13251/j.issn.0254-6051.2023.03.043

Abstract

Abstract: First air quenching 30Cr13 and 30Cr14N steels respectively at different temperatures (950, 1000, 1050, 1100 ℃) in muffle furnace, then the effect of nitrogen content on microstructure, carbides, hardness and corrosion resistance of the 30Cr13 steel was investigated by using laser scanning confocal microscope, scanning electron microscope, hardness tester, X-ray diffractometer, and salt spray tester. The results show that when quenched at the same temperature, the 30Cr14N steel has higher hardness, less carbide and better corrosion resistance than that of the 30Cr13 steel. Nitrogen not only affects the microstructure and hardness of the tested steel, but also avoid the intergranular corrosion caused by excessive carbide precipitation through decreasing carbon and increasing nitrogen, because FeNiN precipitation does not cause significant intergranular corrosion as Cr₂₃C₆ precipitation. Therefore, decreasing carbon and increasing nitrogen is an effective way to improve the microstructure and properties of martensitic stainless steel.

Key words: martensite stainless steel 30Cr13, quenching temperature, nitrogen content, hardness, corrosion resistance

CLC Number:

TG142.7

Ji Xianbin, Li Zhaoguo, Wei Haixia, Qian Zhangxin. Effect of decreasing carbon and increasing nitrogen on microstructure and properties of quenched martensitic stainless steel[J]. Heat Treatment of Metals, 2023, 48(3): 259-262.

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