Abstract
Zhu, H.-L., 2019. Effect of heat input on weld structure and mechanical properties of marine engineering steel. In: Gong, D.; Zhu, H., and Liu, R. (eds.), Selected Topics in Coastal Research: Engineering, Industry, Economy, and Sustainable Development. Journal of Coastal Research, Special Issue No. 94, pp. 352–356. Coconut Creek (Florida), ISSN 0749-0208.This study studied the influence of submerged arc welding heat input on the microstructure and mechanical properties of E36 welds for marine engineering, and determined the influence of different welding heat input conditions on the microstructure and properties of welds. The results show that with the increase of welding heat input, the martensite content in the weld microstructure is reduced; the nucleation rate of the carbide-free bainite is also reduced, resulting in the carbide-free bainite roughening. And when the bainite phase change, the increase of heat input makes the diffusion distance of carbon atoms farther, which promotes the transformation of retained austenite shape from film to block. In addition, as the heat input increases, the weld metal strength decreases, and the impact toughness is not sensitive to heat input.
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