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|標題:||Dendrite evolution of delta (delta) ferrite and precipitation behavior of sigma (sigma) phase during multipass dissimilar stainless steels welding|
|期刊/報告no：:||Metals and Materials International, Volume 16, Issue 3, Page(s) 349-356.|
|摘要:||The purpose of this study is to discuss the development of dendrite delta-ferrite and the precipitation behavior of sigma 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 delta, sigma, and gamma 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 delta phase precipitated in the secondary and the tertiary dendrite arms of the delta-ferrite and it was able to grow on the dendrite arms along the [1(1) over bar 1] crystallographic in a 45 degrees angle. The sigma phase was also able to form stably after the phase decomposition of delta-ferrite into globular and lacy morphologies.|
|Appears in Collections:||材料科學與工程學系|
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