Effective grain size and charpy impact properties of high-toughness X70 pipeline steels
SCIE
SCOPUS
- Title
- Effective grain size and charpy impact properties of high-toughness X70 pipeline steels
- Authors
- Hwang, B; Kim, YG; Lee, S; Kim, YM; Kim, NJ; Yoo, JY
- Date Issued
- 2005-08
- Publisher
- MINERALS METALS MATERIALS SOC
- Abstract
- The correlation of microstructure and Charpy V-notch (CVN) impact properties of a high-toughness API X70 pipeline steel was investigated in this study. Six kinds of steel were fabricated by varying the hot-rolling conditions, and their microstructures, effective grain sizes, and CVN impact properties were analyzed. The CVN impact test results indicated that the steels rolled in the single-phase region had higher upper-shelf energies (USES) and lower energy-transition temperatures (ETTs) than the steels rolled in the two-phase region because their microstructures were composed of acicular ferrite (AF) and fine polygonal ferrite (PF). The decreased ETT in the steels rolled in the single-phase region could be explained by the decrease in the overall effective grain size due to the presence of AF having a smaller effective grain size. On the other hand, the absorbed energy of the steels rolled in the two-phase region was considerably lower because a large amount of dislocations were generated inside PFs during rolling. It was further decreased when coarse martensite or cementite was formed during the cooling process.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24464
- DOI
- 10.1007/s11661-005-0331-9
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 36A, no. 8, page. 2107 - 2114, 2005-08
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