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Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings

In this study, we investigate the dissolution behavior of eutectic carbides in heavy forgings. High-temperature diffusion treatment was conducted on 35Cr3Ni3MoVW2 (MoVW2) and 35Cr2Ni3MoV (MoV) steels at 1230 °C for a duration ranging from 0 to 100 h. The dissolution of eutectic carbides and its effe...

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Autores principales: Ji, Yu, Xu, Tingting, Zhao, Caiyan, Chen, Guangyao, Zhao, Hongshan, Hu, Chundong, Dong, Han
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10608740/
https://www.ncbi.nlm.nih.gov/pubmed/37895745
http://dx.doi.org/10.3390/ma16206763
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author Ji, Yu
Xu, Tingting
Zhao, Caiyan
Chen, Guangyao
Zhao, Hongshan
Hu, Chundong
Dong, Han
author_facet Ji, Yu
Xu, Tingting
Zhao, Caiyan
Chen, Guangyao
Zhao, Hongshan
Hu, Chundong
Dong, Han
author_sort Ji, Yu
collection PubMed
description In this study, we investigate the dissolution behavior of eutectic carbides in heavy forgings. High-temperature diffusion treatment was conducted on 35Cr3Ni3MoVW2 (MoVW2) and 35Cr2Ni3MoV (MoV) steels at 1230 °C for a duration ranging from 0 to 100 h. The dissolution of eutectic carbides and its effects on the microstructure and hardness of the steels were characterized and analyzed via SEM+EBSD, ImageJ, and Thermo-Calc. The results show that the coarse eutectic carbides in both steels gradually dissolved. The distribution and morphology tend to be uniform and spherical, respectively. For holding 50 h, the hardness of both steels significantly exhibited an increasing trend, and it was attributed to the combined effects of solid solution strengthening. Thermodynamic calculations indicated that the higher W content in MoVW2 steel promoted the precipitation of M(6)C eutectic carbides. Moreover, both MoVW2 and MoV steels exhibited the precipitation of M(7)C(3) eutectic carbides in the final stage of solidification, facilitated by the enrichment of C and Cr in the liquid steels.
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spelling pubmed-106087402023-10-28 Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings Ji, Yu Xu, Tingting Zhao, Caiyan Chen, Guangyao Zhao, Hongshan Hu, Chundong Dong, Han Materials (Basel) Communication In this study, we investigate the dissolution behavior of eutectic carbides in heavy forgings. High-temperature diffusion treatment was conducted on 35Cr3Ni3MoVW2 (MoVW2) and 35Cr2Ni3MoV (MoV) steels at 1230 °C for a duration ranging from 0 to 100 h. The dissolution of eutectic carbides and its effects on the microstructure and hardness of the steels were characterized and analyzed via SEM+EBSD, ImageJ, and Thermo-Calc. The results show that the coarse eutectic carbides in both steels gradually dissolved. The distribution and morphology tend to be uniform and spherical, respectively. For holding 50 h, the hardness of both steels significantly exhibited an increasing trend, and it was attributed to the combined effects of solid solution strengthening. Thermodynamic calculations indicated that the higher W content in MoVW2 steel promoted the precipitation of M(6)C eutectic carbides. Moreover, both MoVW2 and MoV steels exhibited the precipitation of M(7)C(3) eutectic carbides in the final stage of solidification, facilitated by the enrichment of C and Cr in the liquid steels. MDPI 2023-10-19 /pmc/articles/PMC10608740/ /pubmed/37895745 http://dx.doi.org/10.3390/ma16206763 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Ji, Yu
Xu, Tingting
Zhao, Caiyan
Chen, Guangyao
Zhao, Hongshan
Hu, Chundong
Dong, Han
Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings
title Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings
title_full Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings
title_fullStr Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings
title_full_unstemmed Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings
title_short Dissolution Behavior of Eutectic Carbides in Medium-Alloy Steels for Heavy Forgings
title_sort dissolution behavior of eutectic carbides in medium-alloy steels for heavy forgings
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10608740/
https://www.ncbi.nlm.nih.gov/pubmed/37895745
http://dx.doi.org/10.3390/ma16206763
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