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Effect of welding heat input on microstructure and impact toughness in CGHAZ of X100Q steel

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Abstract

The coarse-grained heat-affected zones (CGHAZs) of X100Q steel were reproduced via simulating their welding thermal cycles with the varying heat input (Ej) from 10 to 55 kJ/cm in Gleeble3500 system. The microstructures were characterized, and the impact toughness was estimated from each simulated sample. The results indicate that the microstructure in each simulated CGHAZ was primarily constituted of lath-like bainite. With the decreased heat input and accordingly the lowered Ar3 (the onset temperature for this transition), the prior austenite grain and the bainitic packet/block/lath substructure were refined remarkably, and the impact toughness was enhanced due to the microstructure refinement. The bainitic packet was the microstructural unit most effectively controlling the impact properties in CGHAZ of X100Q steel, due to their close correlation with the 50% fracture appearance transition temperatures, their size equivalent to the cleavage facet and their boundaries impeding the crack propagation.

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Acknowledgements

This work is supported by the Tianjin New Materials Science and Technology Major Project (Grant No. 16ZXCLGX00150), China.

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Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, Hebei, China

    Hui-bin Wang, Fei-long Wang, Gen-hao Shi, Yu Sun, Qing-feng Wang & Fu-cheng Zhang

  2. Technical Center, Tianjin Pipe (Group) Co., Ltd., Tianjin, 300301, China

    Hui-bin Wang, Yu Sun & Jiang-cheng Liu

  3. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao, 066004, Hebei, China

    Fei-long Wang, Gen-hao Shi, Qing-feng Wang & Fu-cheng Zhang

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  1. Hui-bin Wang
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  2. Fei-long Wang
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Correspondence to Qing-feng Wang.

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Wang, Hb., Wang, Fl., Shi, Gh. et al. Effect of welding heat input on microstructure and impact toughness in CGHAZ of X100Q steel. J. Iron Steel Res. Int. 26, 637–646 (2019). https://doi.org/10.1007/s42243-019-00271-5

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  • DOI: https://doi.org/10.1007/s42243-019-00271-5

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