A distinct role of microstructure on hot corrosion behaviour of additively manufactured IN718

被引：0
|
作者：
Mannava, Venkateswararao [1 ,4 ]
Saravanan, T. T. [2 ]
Sabari, Singaravelu Rajan [4 ]
Koundinya, N. T. B. N. [3 ,4 ]
Venugopal, A. [2 ]
Murty, S. V. S. N. [2 ]
Govind, B. [2 ]
Kamaraj, M. [4 ]
Kottada, Ravi Sankar [4 ]
机构：
[1] Queens Univ, Dept Mech & Mat Engn, Kingston, ON K7L 3N6, Canada
[2] ISRO, Vikram Sarabhai Space Ctr, Thiruvananthapuram 695022, India
[3] IIT Jodhpur, Dept Met & Mat Engn, Karwar 342037, India
[4] IIT Madras, Dept Met & Mat Engn, Chennai 600036, India
来源：
CORROSION SCIENCE | 2024年 / 241卷
关键词：
superalloy; IN718; LPBF; GDOES; Raman spectroscopy; hot corrosion; Additive Manufacturing; NI-BASE SUPERALLOY; MECHANICAL-PROPERTIES; OXIDATION BEHAVIOR; ALLOY; ORIENTATION; NACL;
D O I：
10.1016/j.corsci.2024.112550
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of LPBF-IN718 microstructure on hot corrosion behavior was studied at 650 degrees C. The H-IN718 with <001> oriented grains undergo more weight changes than V-IN718 with <110> oriented grains. Detailed characterization analysis corroborates that Rapp-Goto fluxing and sulphidation mechanisms are operating in LPBF-IN718 with 3SM. Further, GDOES confirms the sulphur gradient existence between Air/3SM and 3SM/HIN718 interfaces. It suggests that <001> oriented grains serve as preferred sites for ion adsorption and reactions, which might facilitate the sulfur diffusion more effectively than other grain orientations. As a result, oxy-anions generated during sulfidation enhance the fluxing mechanism, thus increasing weight gain in H-IN718.
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页数：9
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