Effect of simulated welding thermal cycle on microstructure and mechanical properties of X90 pipeline steel |
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Authors: | Wengui ZhaoWei Wang Shaohui ChenJinbo Qu |
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Affiliation: | Institute of Research of Iron and Steel (IRIS), Sha-steel, Jiangsu 215625, China |
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Abstract: | The effect of welding thermal cycle simulation on the microstructure and mechanical properties of X90 pipeline steel was investigated by means of microstructure analysis, tensile- and Charpy impact-tests. At the heat input of 15 kJ/cm, the microstructure of coarse-grained heat affected zone is mainly composed of lath bainite and granular bainite, resulting in excellent strength and toughness. At 25 kJ/cm with two thermal cycles, however, strength and impact toughness decrease due to the formation of more polygonal ferrite with coarser grains. |
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Keywords: | Microstructure Mechanical properties X90 pipeline steel Welding thermal cycle Welding heat input Coarse-grained heat affected zone |
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