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Effect of Welding Heat Input on Microstructure and Impact Toughness of the Simulated CGHAZ in Q500qE Steel |
ZHU Dongming1, HE Jiangli2,3, SHI Genhao2,3, WANG Qingfeng2,3() |
1.China Railway Jiujiang Bridge Engineering Co., Ltd., Jiujiang 332004, China 2.College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China 3.State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China |
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Cite this article:
ZHU Dongming, HE Jiangli, SHI Genhao, WANG Qingfeng. Effect of Welding Heat Input on Microstructure and Impact Toughness of the Simulated CGHAZ in Q500qE Steel. Acta Metall Sin, 2022, 58(12): 1581-1588.
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Abstract As China's economy enters a stage of high-quality development, it is important to study high-performance bridge steels with high strength, high toughness, high efficiency, and easy welding. Presently, coarse-grained heat-affected zones (CGHAZs) of high-performance bridge steels are prone to coarse-grain embrittlement, which reduces its impact toughness. To improve their low-temperature toughness, the relationship between their microstructure and impact toughness has been extensively researched and discussed. However, the control connection and internal mechanism between the bainite microstructure and impact toughness have not been clarified. In this study, the simulated samples of CGHAZs in Q500qE steel with varying heat inputs, from 15 to 30 kJ/cm, were reproduced in Gleeble 3500 thermal simulation-testing machine. The effect of different heat inputs on the microstructure, impact toughness of CGHAZs, and their inherent mechanism was discussed and analyzed in-depth using OM, SEM, and EBSD. The results indicate that the microstructure of each simulated sample of CGHAZs in Q500qE steel was composed of lath-like bainite (LB) and granular-like bainite (GB). The LB increased, the GB reduced, phase-transition temperature (Ar3) declined, and the bainitic packet/block substructure refined as the welding heat input decreased. In addition, with the decreased heat inputs, the Charpy impact energy (KV2) at -40oC of CGHAZs is enhanced because of the refined microstructure. The impact fracture of all samples showed cleavage fracture characteristics, and the cleavage face size of the simulated samples of CGHAZs decreased due to the reduced heat inputs. Compared with prior austenite grain boundary and bainite block, the bainite packet is the most effective microstructural unit for controlling the impact toughness of CGHAZs in Q500qE steel, and its boundary effectively facilitates the prevention of further propagation of a secondary crack.
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Received: 26 April 2021
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Fund: National Natural Science Foundation of China(51671165) |
About author: WANG Qingfeng, professor, Tel: 13933560072, E-mail: wqf67@ysu.edu.cn
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