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Effect of Ti–Mg–Ca treatment on properties of heat-affected zone after high heat input welding

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Abstract

The combined influence of Mg and Ca treatment on the properties of heat-affected zone (HAZ) of low-carbon steel after high heat input welding was systematically studied. Experimental steels deoxidized with different elements were prepared, i.e., C–Mn steel with Al, Ti–Ca steel with Ti and Ca, Ti–Mg–Ca steel with Ti, Mg and Ca. Results showed that the inclusions in C–Mn steel were mainly Al2O3 and MnS with low density and large size. However, the average size was refined to only ~ 0.34 μm in Ti–Mg–Ca steel and the amount increased remarkably. Microstructure of simulated HAZ for 200 kJ/cm changed from ferrite side plates or upper bainite to acicular ferrite after treatment with Ti, Mg and Ca. Ca addition decreased the strain field around inclusions and enhanced the ability of acicular ferrite nucleation. In situ observation of Ti–Mg–Ca steel showed that the movement of austenite grain boundaries was retarded and nucleation sites of acicular ferrite were greater than Ti–Ca steel because of Mg addition. Impact energy of HAZ at − 40 °C was increased from 7 to 232 J and showed excellent stability because of Ti–Mg–Ca treatment. High volume fraction of acicular ferrite acted as obstacles toward cleavage cracks.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2016YFB0300602). R.D.K. Misra gratefully acknowledges continued collaboration with Northeastern University as an honorary professor by providing guidance to students in research.

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, Liaoning, China

    Hao-nan Lou, Chao Wang, Bing-xing Wang & Zhao-dong Wang

  2. Laboratory for Excellence in Advanced Steels Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at EI Paso, EI Paso, 79968, TX, USA

    R.D.K. Misra

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  1. Hao-nan Lou
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  2. Chao Wang
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  3. Bing-xing Wang
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  4. Zhao-dong Wang
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Correspondence to Bing-xing Wang.

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Lou, Hn., Wang, C., Wang, Bx. et al. Effect of Ti–Mg–Ca treatment on properties of heat-affected zone after high heat input welding. J. Iron Steel Res. Int. 26, 501–511 (2019). https://doi.org/10.1007/s42243-018-0091-6

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  • DOI: https://doi.org/10.1007/s42243-018-0091-6

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