Effect of heat treatment on microstructure and hardness of economic high carbon martensitic stainless steel J50Cr13

doi:10.13251/j.issn.0254-6051.2022.08.024

Abstract

Abstract: High carbon martensitic stainless steel J50Cr13 was treated with different quenching temperatures and cooling modes. Microstructure and hardness of the tested steel were analyzed by optical microscope observation (OM), X-ray diffraction (XRD) analgss and hardness test. The results show that, with the increase of quenching temperature, the martensite structure coarsens, the content of retained austenite increases, and the carbides gradually dissolve into the matrix. With the increase of quenching temperature in 990-1080 ℃, the hardness values of both the water-cooled and air-cooled tested steel specimens increase; while when the quenching temperature increases to 1110 ℃ from 1080 ℃, the hardness values decrease. When quenched at 990 ℃, the difference between the hardness values of water-cooled and air-cooled specimens is the largest and up to 3 HRC, and when the quenching temperature increases, the effect of cooling on the hardness of the tested steel becomes less. When the quenching temperature is 1110 ℃, the hardness values of the water-cooled and air-cooled specimens are almost the same. The optimal quenching temperature of the J50Cr13 high carbon martensitic stainless steel is 1080 ℃, and then water cooling.

Key words: J50Cr13 steel, quenching temperature, microstructure, carbide, hardness

CLC Number:

TG142.1

Wei Haixia, Pan Jixiang, Ji Xianbin, Li Zhaoguo, Xu Bin. Effect of heat treatment on microstructure and hardness of economic high carbon martensitic stainless steel J50Cr13[J]. Heat Treatment of Metals, 2022, 47(8): 148-151.

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