YU Wen-tao, LI Jing, SHI Cheng-bin, ZHU Qin-tian, SONG Hui-dong, SHI Chang-min. Microstructure and carbides of as-cast high carbon martensitic stainless steel 8Cr13MoV[J]. Chinese Journal of Engineering, 2016, 38(9): 1264-1269. DOI: 10.13374/j.issn2095-9389.2016.09.010
Citation: YU Wen-tao, LI Jing, SHI Cheng-bin, ZHU Qin-tian, SONG Hui-dong, SHI Chang-min. Microstructure and carbides of as-cast high carbon martensitic stainless steel 8Cr13MoV[J]. Chinese Journal of Engineering, 2016, 38(9): 1264-1269. DOI: 10.13374/j.issn2095-9389.2016.09.010

Microstructure and carbides of as-cast high carbon martensitic stainless steel 8Cr13MoV

  • The solidification process of 8Cr13MoV martensitic stainless steel was calculated by using Thermo-Calc software. The solidification microstructure, morphology and type of carbides were analyzed by optical microscopy, scanning electron microscopy and X-ray diffraction. The static continuous cooling transformation curve was measured by Gleeble thermal simulator. The results indicate that the microstructure of 8Cr13MoV includes ferrite and M23C6 under the equalized solidification condition, while ferrite, martensite, retained austenite, M7C3 and M23C6 in the practical solidification condition. The main carbides are M7C3, and a small number of M23C6 with lamellar or dendritic morphology distribute on the grain boundaries, which can be attributed to element segregation. Because of high C and Cr contents, austenite can transform to martensite at a cooling rate of 0.1℃·s-1.
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