Ni基合金溶接金属／低合金鋼境界部における組織的特徴とSCC進展挙動
Characteristics of microstructure and SCC behavior near the fusion boundaryof Ni-base weld metal and low alloy steel
著者:
阿部 博志 Hiroshi ABE 石澤 允 Makoto ISHIZAWA 渡辺 豊 Yutaka WATANABE
発刊日:
公開日:
Dissimilar WeldLow Alloy SteelNi-based WeldStress Corrosion Cracking (SCC)
概要
SCC behavior near the fusion boundary of dissimilar weld joint with Ni-based weld metal and low alloy steel in high temperature water has been investigated with special attention on relation t o the characteristics of microstructure. From the results of CBB test (1.0 ppm-Na2SO4 and 8 ppm dissolved oxygen), it has been obvious that the LAS has no SCC susceptibility. On the other hand, Alloy182 in the weld samples have SCC susceptibility. Most of crack tips have located at the fusion boundary, and the penetration of oxide into LAS has been observed. It has been thought that c rack become obtuse when crack reach at fusion boundary. It has been suggested that the dominant factor of crack retardation or arrest is low SCC susceptibility of LAS in high temperature water.
