Effect of Heat Input on Inclusion Evolution Behavior in Heat-Affected Zone of EH36 Shipbuilding Steel
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The effects of heat input parameters on inclusion and microstructure characteristics have been investigated using welding thermal simulations. Inclusion features from heat-affected zones (HAZs) were profiled. It was found that, under heat input of 120 kJ/cm, Al-Mg-Ti-O-(Mn-S) composite inclusions can act effectively as nucleation sites for acicular ferrites. However, this ability disappears when the heat input is increased to 210 kJ/cm. In addition, confocal scanning laser microscopy (CSLM) was used to document possible inclusion–microstructure interactions, shedding light on how inclusions assist beneficial transformations toward property enhancement.
Support from the National Natural Science Foundation of China (51622401 and 51628402), National Key Research and Development Program of China (2016YFB0300602), and Global Talents Recruitment Program endowed by the Chinese Government is gratefully acknowledged. Thanks are also due to the Research Fund for Central Universities (N150205001), Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences (2015KF04), and State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology (AWJ-16-Z04).
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