Research Progress on Additive Manufacturing of Low Activation Steels
Reduced activation ferritic/martensitic(RAFM)steels are currently the more mature fusion reactors structural materials.Oxide dispersion strengthened(ODS)steels with low activation characteristics,which have both irradiation stability and high temperature strength,are the most promising structural material for fusion reactors.Typical application cases of additive manufacturing technology in the field of fusion reactor structural materials are summarized.The research progress on the control of microstructure and optimization of mechanical properties of RAFM steels for additive manufacturing is reviewed in terms of heat input,scanning strategies,sample sizes,powder characteristics,and heat treatment optimization.The research strategies of powder preparation,defect control and nanophase regulation of ODS steels with specific low activation characteristics in additive manufacturing are reviewed.Finally,the opportunities and challenges of additively manufactured RAFM steels and low activation ODS steels are summarized,and their development trends and technical difficulties are prospected.
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