Microstructural control of weld heat-affected zone of steel by Mn depletion around non-metallic inclusions

Shuji Aihara, Genichi Shigesato, Masaaki Sugiyama, Ryuji Uemori

研究成果: ジャーナルへの寄稿評論記事


Role of Mn depleted zone formed around MnS precipitate in transformation of intra-granular ferrite (IGF) in low alloy steel subjected to simulated thermal cycle of weld heat-affected zone (HAZ) was studied. Mn distribution in austenite (γ) adjacent to MnS were examined by field-emission type transmission electron microscope (FE-TEM) with energy dispersive X-ray spectroscopy (EDS). Foil samples for TEM were prepared using focused ion beam (FIB), which enabled a direct measurement of Mn concentration profiles near MnS. Change in area fraction of IGF with thermal cycle conditions was well explained by the extent of Mn depletion. It was concluded that the formation of IGF was controlled strongly by the Mn depletion effect in low alloy steels.

ジャーナルNippon Steel Technical Report
出版物ステータス出版済み - 1 2005


All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry