微視組織に着目した316L鋼溶融境界近傍のSCC進展遅延メカニズム解明


英字タイトル:
SCC Retardation Mechanism near Fusion Boundary in 316L SS Welds from Microstructure Point of View
著者:
阿部 博志 Hiroshi ABE 渡辺 豊 Yutaka WATANABE 宮崎 孝道 Takamichi MIYAZAKI
発刊日:
公開日:
カテゴリ: 第5回
キーワードタグ:

概要

SCC behavior near the fusion line of 316L SS welds in high SCC behavior near the fusion line of 316L SS welds in high temperature water has been investigated with special attention on relation to the characteristics of microstructure. Island-type S-ferrite has been distributed on grain boundary, namely along the potential crack path, in partially melted zone of 316L SS weld samples. Most of crack tips have been located on d-ferrite in partially melted zone of both weld samples. Cr2O3 which makes low oxidation rate of 8-ferrite compared with that of austenite phase has been formed by oxidation of S-ferrite at the crack tip. It has been suggested that the island-type 8-ferrite in partially melted zone would act as a crack arrester. The retardation mechanism of SCC near fusion line has been proposed assuming that solid oxidation has an essential role in SCC progress.


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