Effects of thermal history and microstructure on grain boundary segregation in the heat-affected zone of an Alloy182-A533B dissimilar weld joint
英字タイトル:
Effects of thermal history and microstructure on grain boundary segregation in the heat-affected zone of an Alloy182-A533B dissimilar weld joint
著者:
Ziqing ZHAI Yuichi MIYAHARA Hiroshi ABE Yutaka WATANABE
発刊日:
公開日:
atom probe tomographygrain boundary segregationheat-affected zone microstructurelow alloy steelthermal history
Effects of thermal history and microstructure on grain boundary segregation in the heat-affected zone of an Alloy182-A533B dissimilar weld joint
著者:
Ziqing ZHAI Yuichi MIYAHARA Hiroshi ABE Yutaka WATANABE
発刊日:
公開日:
カテゴリ: 第11回
キーワードタグ:atom probe tomographygrain boundary segregationheat-affected zone microstructurelow alloy steelthermal history
概要
Grain boundary (GB) segregation of phosphorus and alloying elements in the heat-affected zone (HAZ) of an Alloy182- A533B dissimilar weld joint used in nuclear reactor pressure vessels was studied quantitatively by three-dimensional atom probe tomography. Non-equilibrium segregation occurred during welding and post-weld heat treatment, leading to remarkable enrichment of P, C, Mn and Mo at GBs, of which the levels were all microstructure- dependent. After step cooling, P and Mn showed further increase at GBs through equilibrium segregation, while decrease in the GB content was observed for C and Mo. The results indicated increasing susceptibility of temper embrittlement of HAZ in progress with service time.
