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ZHANG Nan, DONG Xianchun, PAN Hui, ZHANG Jun. Mechanical behavior of welded joint of a high Ti-Nb content microalloyed high-strength steel before and after drawing temper treatment[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(5): 93-98.
Citation: ZHANG Nan, DONG Xianchun, PAN Hui, ZHANG Jun. Mechanical behavior of welded joint of a high Ti-Nb content microalloyed high-strength steel before and after drawing temper treatment[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(5): 93-98.
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Mechanical behavior of welded joint of a high Ti-Nb content microalloyed high-strength steel before and after drawing temper treatment

  • Shougang Research Institute of Technology, Beijing 100041, China

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  • Received Date: November 04, 2013
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  • In this paper, the MAG welding using 80%Ar+20％CO2 was applied on a Ti-Nb type microalloy TMCP high-strength steel. The mechanical properties of the welded joint before and after drawing temper treatment were particularly investigated, which aimed at clarifying the softening mechanism of welded joint systematically and comprehensively analyzing the correlation between the variation of mechanical properties and microstructure. The results showed that with increasing of heat input, the precipitated particles of (Ti.Nb)(C,N) were dissolved during the welding thermal cycle, which improved the softening tendency of CGHAZ. The post drawing temper treatment mitigated the softening behaviors of welded joints and the strength of the base metal were improved. Moreover, with the increase of tempering temperature, the impact toughness of welded joint and base metal were decreased, due to the inheritance of original microstructure and the precipitation of Fe3C-typed carbide along grain boundaries.
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  • 贺信莱, 尚成佳, 杨善武, 等. 高性能低碳贝氏体钢[M]. 北京: 冶金工业出版社, 2008.
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    Joonoh M, Changhee L. Behavior of (Ti, Nb)(C, N) complex particle during thermo-mechanical cycling in the weld CGHAZ of a microalloyed steel[J]. Acta Materialia, 2009(57): 2311-2320.
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