Unexpectedly high corrosion susceptibility near fusion boundaries of Inconel 625 manufactured by laser powder bed fusion

被引：9
作者：
Zhu, Jie [1 ]
Kokawa, Hiroyuki [1 ,3 ]
Feng, Kai [1 ,2 ]
Li, Zhuguo [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China
[2] Collaborat Innovat Ctr Adv Ship & Deep Sea Explora, Shanghai 200240, Peoples R China
[3] Tohoku Univ, Dept Mat Proc, Sendai 9808579, Japan
来源：
CORROSION SCIENCE | 2023年 / 223卷
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
Nickel alloy( A ); Laser powder bed fusion; TEM( B ); Intergranular corrosion ( C ); 316L STAINLESS-STEEL; MICROSTRUCTURAL EVOLUTION; RESISTANCE; BEHAVIOR; STRESS; INCLUSIONS; STRENGTH;
D O I：
10.1016/j.corsci.2023.111432
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The intergranular corrosion (IGC) resistance of Inconel 625 produced by laser powder bed fusion was investigated according to ASTM-G28 method A. Unexpected severe corrosion near fusion boundaries was found. The initiation and expansion of corrosion along fusion boundaries and the relationship between microstructure and corrosion behavior were analyzed. This unusual corrosion behavior was related to the Volta potential variation near fusion boundaries. This Volta potential difference was caused by the Al2O3 nanoparticles and Mo, Nb-rich precipitates near the fusion boundaries. This finding may enhance the understanding of corrosion behavior of LPBFed nickel alloys.
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页数：11
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