报告题目 (Title)：基于增材制造的FM-ODS合金研发进展（Additive manufacturing based FM-ODS Alloy Development）

报告人 (Speaker)：Suk Hoon Kang研究员（韩国原子能研究院）

报告时间 (Time)：2024年12月6日(周五) 9:00

报告地点 (Place)：校本部复合材料研究中心一楼会议室A101

邀请人(Inviter)：毛小东 研究员

主办部门：理学院纳米中心

报告摘要：Hardfacing alloys should be resistant to severe deformation and wear in nuclear reactors while minimizing gamma radionuclides such as cobalt at the same time. Oxide dispersion strengthened (ODS) ferritic/martensitic (FM) steel is a candidate hardfacing material for nuclear reactors because yttrium-based nano oxides resist deformation and wear. FM-ODS steel powders are conventionally fabricated with ball milling to disperse nano yttria in FM steel powder. However, nano yttria inside the ODS powders are frequently agglomerated during laser-directed energy deposition (L-DED) process. Recently, dissolving yttrium during the gas atomization process is an alternative way to produce ODS powders but yttrium is highly reactive with ceramic crucible. In this study, FM-ODS steel powder was produced by electron induction melting gas atomization (EIGA) process without using crucible. Powder morphology and microstructure were observed using a scanning electron microscope (SEM) and SEM-energy dispersive X-ray spectroscopy (EDS). The size distribution and number density of yttria were calculated with transmission electron microscope (TEM). The nanohardness of EIGA ODS powders were conducted at 10mN force.