Abstract
Microstructure evolution and grain boundary misorientation in coarse-grained heat-affected zone of EH420 shipbuilding steel have been investigated at different welding heat inputs. As heat input increases, main constituents transform from lath bainites to granular bainites, and to acicular ferrites as a result of reduced cooling rate. Corresponding fraction of high angle grain boundaries decreases from 28.24 to 20.04 pct as heat input is raised from 50 to 150 kJ/cm but reverses to 29.04 pct at 200 kJ/cm.
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The authors would like to acknowledge the support from the National Natural Science Foundation of China (51622401, 51861130361, 51861145312 and 51850410522), Newton Advanced Fellowship by Royal Society (RP12G0414), Research Fund for Central Universities (N172502004), Xingliao Talents Program (XLYC1807024 and XLYC1802024), and Global Talents Recruitment Program endowed by the Chinese Government. Xiaodong Zou also appreciates the auspices from China Scholarship Council (No. 201806080143) and Chinese Association for Science and Technology.
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Manuscript submitted August 25, 2019.
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Zou, X., Sun, J., Matsuura, H. et al. Unravelling Microstructure Evolution and Grain Boundary Misorientation in Coarse-Grained Heat-Affected Zone of EH420 Shipbuilding Steel Subject to Varied Welding Heat Inputs. Metall Mater Trans A 51, 1044–1050 (2020). https://doi.org/10.1007/s11661-019-05604-3
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DOI: https://doi.org/10.1007/s11661-019-05604-3