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초록· 키워드
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Super duplex stainless steels (sDSS) are excellent for use under severely corrosive conditions such as offshore and marine applications like pipelines and flanges. sDSS has better mechanical properties and corrosion resistance than the standard duplex stainless steel (DSS) but it is easier for a sigma phase to appear, which depresses the mechanical property and corrosion resistance, compared to DSS, because sDSS has a higher alloy element than DSS. In addition, sDSS has a feeble ductile-brittle transition temperature (DBTT) because it has a 50% ferrite microstructure. In the actual operating environment, sDSS would be thermally affected by welding and a sub-zero temperature environment. This study analyzed how precipitated sDSS behaves at a sub-zero temperature through annealing heat treatment and a sub-zero tensile test. Six types of specimens with annealing times of up to 60 min were tested in a sub-zero chamber. According to the experimental results, an increase in the annealing time reduced the elongation of sDSS, and a decrease in the tensile test temperature raises the flow stress and tensile stress. In particular, the elongation of specimens annealed for 15 min and 30 min was clearly lowered with a decrease in the tensile test temperature because of the increasing sigma phase fraction ratio.
목차
ABSTRACT
1. 서론
2. 실험재료
3. 실험장비 및 방법
4. 실험결과 및 고찰
5. 결론
References
참고문헌 (7)
참고문헌 신청
1. [학술지(정기간행물)] - Borvik, T / 2010 / Pipe Fittings in Duplex Stainless Steel with Deviation in Quality caused by Sigma Phase Precipitation / Materials Science and Engineering A 527 (26) : 6945 ~ 6955
2. [학술지(정기간행물)] - Ghosh, S.K / 2008 / High Temperature Ageing Behaviour of a Duplex Stainless Steel / Materials Characterization 59 (12) : 1776 ~ 1783
3. [학술지(정기간행물)] - Iris, A.A / 2007 / Duplex Stainless Steels: Brief History and Some Recent Alloys / Recent Patents on Mechanical Engineering 1 (1) : 51 ~ 57
4. [학술지(정기간행물)] - Kashiwar, A / 2012 / Effect of Solution Annealing Temperature on Precipitation in 2205 Duplex Stainless Steel / Materials Characterization 74 (1) : 55 ~ 63
5. [학술지(정기간행물)] - Li, J / 1993 / σ Phase Precipitation and its Effect on The Mechanical Properties of a Super Duplex Stainless Steel / Materials Science and Engineering A 174 (2) : 149 ~ 156
2. [학술지(정기간행물)] - Ghosh, S.K / 2008 / High Temperature Ageing Behaviour of a Duplex Stainless Steel / Materials Characterization 59 (12) : 1776 ~ 1783
3. [학술지(정기간행물)] - Iris, A.A / 2007 / Duplex Stainless Steels: Brief History and Some Recent Alloys / Recent Patents on Mechanical Engineering 1 (1) : 51 ~ 57
4. [학술지(정기간행물)] - Kashiwar, A / 2012 / Effect of Solution Annealing Temperature on Precipitation in 2205 Duplex Stainless Steel / Materials Characterization 74 (1) : 55 ~ 63
5. [학술지(정기간행물)] - Li, J / 1993 / σ Phase Precipitation and its Effect on The Mechanical Properties of a Super Duplex Stainless Steel / Materials Science and Engineering A 174 (2) : 149 ~ 156
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