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Influence of Ti on weld microstructure and mechanical properties in large heat input welding of high strength low alloy steels

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Abstract

The influence of Ti on weld microstructure and mechanical properties in large heat input welding of high strength low alloy steels is investigated. The results indicate that a moderate amount of Ti is still effective for grain refinement even under larger heat input and a large amount of acicular ferrite (AF) is formed in the weld metal when Ti content is within 0.028%–0.038%. With increasing Ti content, proeutectoid ferrite in the weld metal decreases, whereas bainite and M-A constituent increase. The type of inclusion in the welds varies from Mn-Si-Al-O to Ti-Mn-Al-O and finally to Ti-Al-O as Ti content increases from 0 up to 0.064 %. As for adding 0.028%–0.038% Ti, high weld toughness could be attained since most inclusions less than 2 µm which contain Ti2O3 provide the effective nuclei for acicular ferrite formation. However, the toughness of the weld metals severely reduces when Ti content is over the optimum range of 0.028%–0.038%.

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Authors and Affiliations

  1. China Iron and Steel Research Institute Group, 100081, Beijing, China

    A-rong (Doctor Candidate), Lin Zhao, Chuan Pan & Zhi-ling Tian

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  1. A-rong
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  2. Lin Zhao
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  3. Chuan Pan
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  4. Zhi-ling Tian
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Correspondence to A-rong.

Additional information

Foundation Item: Item Sponsored by National High Technology Research and Development Project of China (2009AA03Z530)

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A-rong, Zhao, L., Pan, C. et al. Influence of Ti on weld microstructure and mechanical properties in large heat input welding of high strength low alloy steels. J. Iron Steel Res. Int. 22, 431–437 (2015). https://doi.org/10.1016/S1006-706X(15)30023-6

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  • DOI: https://doi.org/10.1016/S1006-706X(15)30023-6

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