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Effect of Compositional Changes of Laves Phase Precipitate on Grain Boundary Embrittlement in Long-Term Annealed 9 Pct Cr Ferritic Steel

Title
Effect of Compositional Changes of Laves Phase Precipitate on Grain Boundary Embrittlement in Long-Term Annealed 9 Pct Cr Ferritic Steel
Author
김종렬
Keywords
HEAT-RESISTANT STEELS; MARTENSITIC 9CR STEELS; MECHANICAL-PROPERTIES; 9CR-1.8W-0.5MO-VNB STEEL; MICROSTRUCTURE EVOLUTION; VOLUME FRACTION; CREEP-BEHAVIOR; POWER-PLANTS; STRENGTH; RECOVERY
Issue Date
2018-10
Publisher
SPRINGER
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v. 49, No. 10, Page. 4595-4603
Abstract
In 9 to 12 pct chromium steels, the high-temperature mechanical properties are known to be strongly dependent on the formation and coarsening of Laves phase precipitates at boundaries. During high-temperature deformation, the Laves phase precipitate coarsening to over a critical size has been considered to trigger cavity formation at the precipitate-matrix interfaces. This coarsening, accompanied by the diffusion of W, Mo, and Cr, should change the mechanical properties and chemical composition of both Laves phase precipitates and the matrix. In this study, we aimed to clarify the effects of compositional changes of Laves phase precipitates on cavity formation during coarsening. The values of the Fe/Cr and W/Mo ratios in Laves phase precipitates were shown to induce different levels of strain energy in the vicinity of the Laves phase precipitate, consequently promoting the formation of cavities. Therefore, the compositional change of Laves phase precipitates was found to play a critical role in the grain boundary embrittlement of high Cr steel at elevated temperature. (C) The Minerals, Metals & Materials Society and ASM International 2018
URI
https://link.springer.com/article/10.1007/s11661-018-4782-1http://repository.hanyang.ac.kr/handle/20.500.11754/81441
ISSN
1073-5623
DOI
10.1007/s11661-018-4782-1
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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