Formation causes of white bright layer on surface of vacuum oil quenched martensitic stainless steel

doi:10.13251/j.issn.0254-6051.2022.10.047

Abstract

Abstract: Surface of martensitic stainless steel nut was prone to brown yellow rust in the air environment. The surface rust of martensitic stainless steel was analyzed by means of optical microscope, scanning electron microscopy and chemical element detection. The results show that a uniform white bright layer structure is formed on surface of the martensitic stainless steel after vacuum quenched in oil. The corrosion resistance of the white bright layer is worse than that of normal martensite. The white bright layer is easy to rust in the air, and the rust does not penetrate the white bright layer. Through the measurement of carbon content and mechanism analysis, it is considered that the necessary conditions for the formation of white bright layer are vacuum heating and oil cooling. Vacuum heating causes the depletion of alloy element Cr on the surface of stainless steel, and carbon infiltration due to the oil decomposition leads to the carburization of the surface, which leads to no martensitic transformation on the surface of stainless steel during quenching, forming a white bright layer structure with poor corrosion resistance.

Key words: martensitic stainless steel, vacuum solution, rustiness, white bright layer, carbonization

CLC Number:

TG161

Ding Yahong, Zhu Kai, He Jun, Zhu Ling, Wang Qiaoli, Li Jianfei. Formation causes of white bright layer on surface of vacuum oil quenched martensitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(10): 275-282.

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