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Eutectic precipitates and microstructure of electroslag remelted 15Cr–22Ni austenitic heat-resistant steel with varying Nb contents |
Hao-chi Xu1, Cheng-bin Shi1, Xin Zhu1, Shi-jun Wang1, Jing Li1, Shi-zhou Wang1 |
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing (USTB), Beijing 100083, China |
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Abstract The microstructure, eutectic carbides and intermetallic compounds in as-cast ingots with varying Nb contents produced by electroslag remelting were studied. The solidification behavior, microsegregation of alloying elements and its influence on precipitates were analyzed. The increase in Nb content from 0.64 to 1.40 wt.% has no effect on the dendrite morphology and secondary dendrite arm spacing. The total area fraction of eutectic NbC and Laves phase in as-cast ingots increases with the increase in Nb content. The eutectic precipitates in the ingot with 0.64 wt.% Nb are mainly NbC, and the others are Fe2Nb-type Laves phase. Increasing the Nb content of the steel significantly promotes the precipitation of Laves phases and lowers the precipitation temperature of NbC eutectic carbides. Eutectic carbide M2C is precipitated only in the ingot with 1.4 wt.% Nb. The average concentration of Nb in both interdendritic and intragranular regions increases with the increase in Nb content of the steel, leading to a change in the morphology of Fe2Nb-type Laves phase from honeycomb to blocky. Increasing the Nb content exerts little effect on the microsegregation degrees of Si, Mo, Cr and Ni in the steel.
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Cite this article: |
Hao-chi Xu,Cheng-bin Shi,Xin Zhu, et al. Eutectic precipitates and microstructure of electroslag remelted 15Cr–22Ni austenitic heat-resistant steel with varying Nb contents[J]. Journal of Iron and Steel Research International, 2022, 29(11): 1823-1835.
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Gang Gao, Chun-li Zhu, Xiao-fang Shi, Li-zhong Chang. Effect of magnetic field on elements segregation in electroslag ingot[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2022, 29(3): 434-444. |
[3] |
Wen‑jie Tong, Wan‑ming Li, Xi‑min Zang, Peng Wang, Hua‑bing Li, De‑jun Li. Two-dimensional comprehensive mathematical model for electroslag remelting process with pipe electrode[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2021, 28(1): 19-28. |
[4] |
Xiao-ping Ma, Dian-zhong Li. Coalescence-dominated microstructure evolution during solidification of 20SiMn steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(5): 506-516. |
[5] |
Shi-jian Li, Guo-guang Cheng, Yu Huang, Wei-xing Dai, Zhi-qi Miao. Mathematical model for design of optimized multi component slag for electroslag remelting[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(4): 380-391. |
[6] |
Mohammed Ali, David Porter, Jukka Komi, Mamdouh Eissa, Hoda El Faramawy, Taha Mattar. Effect of cooling rate and composition on microstructure and mechanical properties of ultrahigh-strength steels[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(12): 1350-1365. |
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