Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing Steel
Hot rolling can improve the mechanical properties after heat treatment by improving the microstructure. The effect of hot rolling (HR) deformation on the microstructural transformation of G20CrNi2MoA bearing steel in the subsequent CQT (carburizing-quenching and tempering) and RQT (reheating-quenchi...
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MDPI AG
2021-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/6/957 |
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| author | Guanghua Zhou Wenting Wei Qinglong Liu |
| author_facet | Guanghua Zhou Wenting Wei Qinglong Liu |
| author_sort | Guanghua Zhou |
| collection | DOAJ |
| description | Hot rolling can improve the mechanical properties after heat treatment by improving the microstructure. The effect of hot rolling (HR) deformation on the microstructural transformation of G20CrNi2MoA bearing steel in the subsequent CQT (carburizing-quenching and tempering) and RQT (reheating-quenching and tempering) processes was studied. The results indicate that the austenite grain size decreased by 20% after 45% hot rolling reduction, and the number of large-angle grain boundaries increased due to the recovery and recrystallization induced by hot deformation. The refinement effect of hot deformation on austenite grains was retained after dual austenitizing, and the large-angle grain boundaries and massive dislocation in the grains caused by hot deformation promoted the diffusion of carbon atoms during carburization, resulting in a higher surface carbon concentration. The refined grains and higher carbon concentration affected the volume fraction and size of undissolved carbides in RQT specimens. When the initial hot rolling reduction reached 45%, the average particle size of carbides decreased by 40%, and the area volume fraction increased by 37%. The Vickers hardness increased, but the friction coefficient and wear rate were significantly reduced with the increase in the initial hot rolling reduction. The main reasons for the improved wear resistance were fine grains, superior carbide distribution and high hardness. |
| first_indexed | 2024-03-10T10:26:37Z |
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| id | doaj.art-b82f28c0b5b94ecebe4ddfa44f56b858 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T10:26:37Z |
| publishDate | 2021-06-01 |
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| series | Metals |
| spelling | doaj.art-b82f28c0b5b94ecebe4ddfa44f56b8582023-11-21T23:57:37ZengMDPI AGMetals2075-47012021-06-0111695710.3390/met11060957Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing SteelGuanghua Zhou0Wenting Wei1Qinglong Liu2School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, ChinaHubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, ChinaThe State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, ChinaHot rolling can improve the mechanical properties after heat treatment by improving the microstructure. The effect of hot rolling (HR) deformation on the microstructural transformation of G20CrNi2MoA bearing steel in the subsequent CQT (carburizing-quenching and tempering) and RQT (reheating-quenching and tempering) processes was studied. The results indicate that the austenite grain size decreased by 20% after 45% hot rolling reduction, and the number of large-angle grain boundaries increased due to the recovery and recrystallization induced by hot deformation. The refinement effect of hot deformation on austenite grains was retained after dual austenitizing, and the large-angle grain boundaries and massive dislocation in the grains caused by hot deformation promoted the diffusion of carbon atoms during carburization, resulting in a higher surface carbon concentration. The refined grains and higher carbon concentration affected the volume fraction and size of undissolved carbides in RQT specimens. When the initial hot rolling reduction reached 45%, the average particle size of carbides decreased by 40%, and the area volume fraction increased by 37%. The Vickers hardness increased, but the friction coefficient and wear rate were significantly reduced with the increase in the initial hot rolling reduction. The main reasons for the improved wear resistance were fine grains, superior carbide distribution and high hardness.https://www.mdpi.com/2075-4701/11/6/957G20CrNi2MoAhot rollingcarburizingreheatingquenching and temperingcarbides |
| spellingShingle | Guanghua Zhou Wenting Wei Qinglong Liu Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing Steel Metals G20CrNi2MoA hot rolling carburizing reheating quenching and tempering carbides |
| title | Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing Steel |
| title_full | Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing Steel |
| title_fullStr | Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing Steel |
| title_full_unstemmed | Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing Steel |
| title_short | Effect of Hot Rolling on Microstructural Evolution and Wear Behaviors of G20CrNi<sub>2</sub>MoA Bearing Steel |
| title_sort | effect of hot rolling on microstructural evolution and wear behaviors of g20crni sub 2 sub moa bearing steel |
| topic | G20CrNi2MoA hot rolling carburizing reheating quenching and tempering carbides |
| url | https://www.mdpi.com/2075-4701/11/6/957 |
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