Intergranular corrosion characteristics of high-efficiency wire laser additive manufactured Inconel 625 alloys

被引:48
作者
Zhang, Wenzhu [1 ]
Xu, Youwei [1 ]
Shi, Yu [1 ]
Su, Guoxing [1 ]
Gu, Yufen [1 ]
Volodymyr, Korzhyk [2 ]
机构
[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
[2] Zhejiang EO Paton Welding Technol Inst, Hangzhou 311200, Peoples R China
基金
中国国家自然科学基金;
关键词
Inconel 625 (A); Wire laser additive manufacturing (B); Subgrain segregation (C); Intergranular corrosion (C); HEAT-TREATMENT; STAINLESS-STEEL; MICROSTRUCTURAL EVOLUTION; GALVANIC CORROSION; INITIATION SITES; SEM-EDS; BEHAVIOR; SUPERALLOY; PRECIPITATION; SENSITIZATION;
D O I
10.1016/j.corsci.2022.110422
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The subgrain segregation of Inconel 625 components fabricated using high-efficiency wire laser additive manufacturing and its effect on the intergranular corrosion characteristics were investigated. The subgrain segregation occurs between the dendrite core and inter-dendritic region, which increases the lattice distortion energy and lowers the potential. The generated micro-corrosion couple between the dendrite core (cathode) and inter-dendritic region (anode) accelerated the dissolution of the latter. Moreover, the dispersed (Nb, Ti)N precipitates and instability of the passive film in the inter-dendritic region deteriorate the corrosion resistance. These results significantly advance the composition and additive manufacturing design of corrosion-resistant nickel-based superalloys.
引用
收藏
页数:13
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