电焊机2025，Vol.55Issue(2)：18-24,7.DOI:10.7512/j.issn.1001-2303.2025.02.02
保护气氛对激光增材制造316L不锈钢组织和性能的影响
Effect of Protective Atmosphere on Microstructure and Properties of 316L Stainless Steel Fabricated by Laser Additive Manufacturing
摘要
Abstract
This study investigates the influence of different protective atmospheres(argon and nitrogen)on the microstruc-ture and mechanical properties of 316L stainless steel fabricated by laser wire additive manufacturing,aiming to optimize the laser additive manufacturing process for 316L stainless steel.High-speed laser wire additive manufacturing technology was employed to prepare 316L stainless steel specimens under pure argon and pure nitrogen atmospheres.The microstruc-ture,including grain size,orientation,and phase composition,was characterized using scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),and X-ray diffraction(XRD).Mechanical properties were evaluated using tensile testing,and fracture morphology was analyzed.The results show that the microstructure of 316L stainless steel under both argon and nitrogen atmospheres is primarily austenitic,with a small amount of ferrite distributed at the austenite grain boundaries.The average grain size under nitrogen atmosphere(59 μm)is smaller than that under argon atmosphere(66 μm),and the size of oxide inclusions is also reduced.Nitrogen,as a strong austenite-forming element,promotes austenite nucle-ation and refines the grains.Tensile tests reveal that the specimens under nitrogen atmosphere exhibit higher tensile strength(602.9 MPa)and yield strength(220.5 MPa)compared to those under argon atmosphere(549.5 MPa and 201.3 MPa,respec-tively),along with improved elongation.Fracture analysis indicates that both atmospheres result in ductile fracture,with smaller oxide inclusions under nitrogen atmosphere,thereby enhancing the strength and plasticity of the laser wire additive manufactured 316L stainless steel.关键词
激光增材制造/316L不锈钢/细化晶粒/保护气氛Key words
Laser additive manufacturing/316L stainless steel/refined grain/protective atmosphere分类
矿业与冶金引用本文复制引用
顾玉芬,陈计澎,李广,石玗..保护气氛对激光增材制造316L不锈钢组织和性能的影响[J].电焊机,2025,55(2):18-24,7.基金项目
中央引导地方科技发展资金项目(23ZYQA308) （23ZYQA308）
甘肃省科技重大专项(22ZD6GA008) （22ZD6GA008）
甘肃省自然科学基金(21JR7RA233) （21JR7RA233）
甘肃省高等学校产业支撑计划(GCJ2022-38) （GCJ2022-38）
