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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2010.1
- 수록면
- 349 - 356 (8page)
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초록· 키워드
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The purpose of this study is to discuss the development of dendrite δ-ferrite and the precipitation behavior of σ phase in the overlapping heat-affected zones, or the fusion zones, during the multipass dissimilar stainless steels welding process. The color metallographic and color separation techniques were used to clearly identify the δ, σ, and γ phases. The experimental results indicated that the grain refinement was very obvious in the second and third pass fusion zones (304-1 and 304-2) when the welding pass was increased from 1 to 3. This refining phenomenon was attributed to the higher cooling rate and the degree of supercooling. The δ phase precipitated in the secondary and the tertiary dendrite arms of the δ-ferrite and it was able to grow on the dendrite arms along the [111] crystallographic in a 45o angle. The σ phase was also able to form stably after the phase decomposition of δ-ferrite into globular and lacy morphologies.
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