| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Pretreatment Conditions on Microstructure and Plastic Instability Behavior of QP980 Steel |
| ZHANG Peng1, LI Bing1,*, XU Feiyue1, WANG Ruijie1, WANG Min1,2
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1 College of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002, Hubei, China
2 Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Xiangyang 441000, Hubei, China |
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Abstract The impact of Lüders strain on the formability of advanced high strength steels is significant. In this work, through a well-designed set of preconditioning conditions, the microstructure and plastic instability behavior of QP980 steel was examined. The findings reveal that prestraining (4%) and subsequent heat treatment (300 ℃/10 min) can greatly enhance the strength properties of QP980 steel. Despite a slight reduction of only 2.9% in comprehensive elongation, the tensile strength value acquires a remarkable increase of 150 MPa and the yield strength value rises by 466 MPa. These improvements are attributed to the diffusion strengthening of transition carbides and the plastic effect induced by phase change during tempering. Moreover, QP980 steel treated with pre-strain and tempering exhibits distinct Lüders strain characteristics. The study identifies the stability of residual austenite as a key factor influencing the occurrence of Lüders strain in QP980 steel, with some unstable residual austenite being eliminated during the pre-strain and tempering process. Excessive stability of residual austenite hinders the plastic effect induced by phase change under low strain conditions, leading to plastic instability and the formation of Lüders bands during tensile deformation.
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Published: 25 April 2025
Online: 2025-04-18
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2025, Vol. 39 
