Documenting Ferrite Nucleation Behavior Differences in the Heat-Affected Zones of EH36 Shipbuilding Steels with Mg and Zr Additions
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The nucleation behavior of ferrites in the heat-affected zones of EH36-Mg and EH36-Zr shipbuilding steels has been documented. Ferrite laths preferred to nucleate on the surface of Al-Mg-Ti-O-Mn-S inclusions in EH36-Mg, but austenite grain boundaries in EH36-Zr, respectively. It is speculated that Al-Mg-Ti-O-Mn-S provides more effective ferrite nucleation sites than Zr-O-Mn-S-Ca-Mg, and a larger driving force is required for the transformation on Zr-O-Mn-S-Ca-Mg. Such differences led to significant variations of the resultant microstructures.
The authors gratefully acknowledge the support from the National Natural Science Foundation of China (51622401, 51628402, 51861130361, 51861145312, and 51850410522), Newton Advanced Fellowship by Royal Society (RP12G0414), Research Fund for Central Universities (N172502004), National Key Research and Development Program of China (2016YFB0300602), and Global Talents Recruitment Program endowed by the Chinese Government for their financial support. We also thank State Key Laboratory of Solidification Processing, Northwestern Polytechnical University (SKLSP201805). X.Z. also appreciates the financial aid from the China Scholarship Council (No. 201806080143) and Chinese Association for Science and Technology.
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