Formation and evolution of primary carbides in high-carbon martensitic stainless steel

doi:10.1007/s42243-022-00856-7

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Abstract The microstructure of 10Cr15MoVCo electroslag remelting (ESR) ingot was observed using an optical microscope and a scanning electron microscope. There are differences in the number, size, and distribution of primary carbides in different positions of ESR ingot. The results show that the two-dimensional morphology of primary carbides is blocky, fibrous, and spherulitic. The three-dimensional morphology of primary carbides is blocky, spherulitic, fibrous, and short rods. X-ray diffraction results show that primary carbides are M₇C₃ carbides. Electron backscattered diffraction results indicate that large-sized primary carbides consist of blocky, fibrous, and spherulitic carbides with different orientations. High-temperature diffusion annealing experiments show that as the temperature increases, the continuity between primary carbides decreases, and the precipitated secondary carbides disappear. The area fraction of primary carbides is reduced, but the morphology of primary carbide is unchanged. The effect of high-temperature diffusion annealing on the dissolution of M₇C₃ primary carbon compounds in ESR ingot was limited.

Key words： M7C3 primary carbide Morphology High-temperature diffusion annealing Martensitic stainless steel Evolution

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	Chang Sun
	Jing Li
	Jie Zhang
	Wei Yan
	Shou-hui Li

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Chang Sun,Jing Li,Jie Zhang, et al. Formation and evolution of primary carbides in high-carbon martensitic stainless steel[J]. Journal of Iron and Steel Research International, 2023, 30(10): 2000-2009.