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논문 기본 정보

자료유형
학술저널
저자정보
Eun-Joon Chun (Korea Institute of Machinery and Materials) Su-Jin Lee (Korea Institute of Machinery and Materials) Jeong Suh (Korea Institute of Machinery and Materials) Ju-Seung Lee (Defense Agency for Technology and Quality) Namhyun Kang (Pusan National University) Kazuyoshi Saida (Osaka University)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第35卷 第1號
발행연도
2017.2
수록면
79 - 88 (10page)

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초록· 키워드

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The effect of residual metallic sodium on the solidification cracking susceptibility of type 316FR stainless steel was investigated via transverse-Varestraint tests. And a solidification brittle temperature range (BTR) of type 316FR stainless steel was 37 K. However, the BTR expanded from 37 to 67 K, as the amount of metallic sodium at the specimen surface increased from 0 to 7.99 mg/㎠. Microstructural observation of the weld metal suggested that metallic sodium existed in the weld metal, including in the cell boundaries, during welding solidification. Thermodynamic calculations suggested that sodium expanded the temperature range of solidliquid coexistence during welding solidification of the steel weld metal. Therefore, the increased solidification cracking susceptibility (i.e., expansion of the BTR) in the residual sodium environment was attributed to enhanced segregation of sodium during the welding solidification; this segregation, in turn, resulted in an expanded temperature range of solid-liquid coexistence.

목차

Abstract
1. Introduction
2. Materials and experimental procedures
3. Characterization of weld metal microstructureand solidification mode
4. Solidification cracking susceptibility
5. Effect of sodium on solidification cracking susceptibility
6. Mechanism of btr enlargement under sodium environment
7. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2017-581-002326246