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

被引：50

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

来源：

CORROSION SCIENCE | 2022年 / 205卷

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

页数：13

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