Microstructure control to improve creep strength of alumina-forming austenitic heat-resistant steel by pre-strain
- Title
- Microstructure control to improve creep strength of alumina-forming austenitic heat-resistant steel by pre-strain
- Author
- 이창희
- Keywords
- Creep test; Pre-strain; Precipitation behavior; Alumina-forming austenitic heat-resistant (AFA) steel
- Issue Date
- 2018-03
- Publisher
- ELSEVIER SCIENCE INC
- Citation
- MATERIALS CHARACTERIZATION, v. 137, page. 1-8
- Abstract
- At 700 degrees C and 200 MPa, the creep rupture time of W-containing alumina-forming austenitic heat-resistant (WAFA) steel increases from 1044 to 3119 h by pre-strain. Pre-strain introduces a lot of dislocation into the matrix and most of the dislocations remain stable to the end of creep without recovery and recrystallization. In addition, the dislocations have enabled secondary NbC and Laves phase to be uniformly distributed and refined. However, the dislocations lower grain boundary strength due to the coarsening of precipitates along grain boundaries Therefore, the increase in the creep rupture time in spite of deterioration of grain boundary strength is attributed to the dislocation strengthening and enhanced precipitation hardening within grains.
- URI
- https://www.sciencedirect.com/science/article/pii/S1044580317323872?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/117702
- ISSN
- 1044-5803; 1873-4189
- DOI
- 10.1016/j.matchar.2018.01.005
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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