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Effect of nitrogen on microstructure and microsegregation of martensitic stainless steel 4Cr13 produced by electroslag remelting |
Shou-hui Li1, Jing Li1, Jie Zhang1, Cheng-bin Shi1 |
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Two ingots of 4Cr13 martensitic stainless steel with different nitrogen contents, 0.023 and 0.121 mass%, were produced by vacuum induction furnace and electroslag remelting. The microstructure and the microsegregation of the electroslag remelting ingot were analyzed by optical microscopy, scanning electron microscopy and electron microprobe analysis. Thermo-Calc software was used to calculate the nitrogen solubility changes during solidification of high nitrogen martensitic stainless steel and the equilibrium and non-equilibrium phase diagrams of 4Cr13 steel with different nitrogen contents. The solubility of nitrogen in 4Cr13 steel reached the lowest value of 0.118% before the start of the peritectic reaction. The microstructure of 4Cr13 steel was martensite, retained austenite and primary carbide M7C3. Higher nitrogen content increased the content of retained austenite in martensitic stainless steel, inhibited the precipitation of primary carbides and refined the dendrites. Higher nitrogen content could effectively inhibit the microsegregation of C element in martensitic stainless steel; however, it had little effect on Cr, V, Nb and Ti. The peritectic reaction was first carried out in high nitrogen steel during solidification, which advanced the transformation of austenite and inhibited the microsegregation of C element.
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Cite this article: |
Shou-hui Li,Jing Li,Jie Zhang, et al. Effect of nitrogen on microstructure and microsegregation of martensitic stainless steel 4Cr13 produced by electroslag remelting[J]. Journal of Iron and Steel Research International, 2023, 30(09): 1854-1861.
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