南京航空航天大学学报2025，Vol.57Issue(3)：557-561,5.DOI:10.16356/j.1005-2615.2025.03.017
电弧增材制造304不锈钢显微组织与断裂行为
Microstructure and Fracture Behavior of 304 Stainless Steel Prepared by Wire Arc Additive Manufacturing
摘要
Abstract
The columnar grains growth characteristics of components prepared by wire arc additive manufacturing have significant effects on mechanical properties.However,current research on fracture behavior is insufficient.The tensile and fracture behaviors of 304 stainless steel thin-wall component along deposition and scanning directions are investigated,and optical microscope(OM),scanning electron microscope(SEM)and electron backscatter diffraction(EBSD)are used to characterize cross-section fractures,aiming at unraveling the fracture mechanism.The findings show that columnar grains grow along deposition direction,inducing a lower strength than that along scanning direction.But the obvious necking appears at fracture position,with numerous fine dimples distributed,signifying greater plastic behavior.However,the interlayer with coarser columnar grains also becomes the weak region,even fracture within the layer under tensile stress paralleling columnar boundaries.Conversely,scanning direction exhibits a higher strength with lower plasticity,attributed to dislocations suppressed by boundaries under vertical stresses.Additionally,numerous low angle grain boundaries and strain are detected in the fracture,indicating non-uniform dislocation slip and eventual fracture under strain concentration.关键词
304不锈钢/电弧增材制造/显微组织/力学性能/断裂行为Key words
304 stainless steel/wire arc additive manufacturning/microstructure/mechanical properties/fracture behavior分类
矿业与冶金引用本文复制引用
陈超,任柏桥,傅彦,高义皓,隋昕晨,陈运好,赵小辉..电弧增材制造304不锈钢显微组织与断裂行为[J].南京航空航天大学学报,2025,57(3):557-561,5.基金项目
国家自然科学基金青年科学基金(52305362). （52305362）
