Effect of Precipitation Control on Strength and Impact Toughness in Advanced Pressure Vessel Steel
SCIE
SCOPUS
- Title
- Effect of Precipitation Control on Strength and Impact Toughness in Advanced Pressure Vessel Steel
- Authors
- Sung, H.J.; Kim, S.-J.
- Date Issued
- 2019-11
- Publisher
- SPRINGER
- Abstract
- This paper reports the effect of increase in vanadium (V) content on changes in precipitation reaction and on mechanical properties in SA1017 grade 23 steel (2.25Cr-1.5W-VNbTi) for application to pressure vessels in advanced nuclear reactors. Increase in V content prohibits formation of coarse M23C6 carbide and allows only fine MX carbo-nitrides precipitation in this steel during tempering. Calculation based on Ashby-Orowan equation suggests that increase in yield strength is mainly attributed to precipitation hardening of fine MX carbo-nitrides and it shows a good agreement with experimental results. Meanwhile, step-cooling heat treatment causing temper embrittlement decreases Charpy impact toughness of steels at sub-zero temperatures, but higher V-alloyed steel shows higher toughness. Because interfaces between MX carbo-nitrides and the matrix act as strong trap sites of segregating P, its segregation toward prior austenite grain boundaries is decreased. Therefore, alloy design of V content for SA1017 grade 23 improves strength without degradation of impact toughness and temper embrittlement. (C) The Minerals, Metals & Materials Society and ASM International 2019
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/100298
- DOI
- 10.1007/s11661-019-05416-5
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 50A, no. 11, page. 5015 - 5022, 2019-11
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