1118 改良9Cr鋼の溶接部の微視組織を考慮したFEMクリープ解析(OS11. 材料の組織・強度に関するマルチスケールアナリシス(4),オーガナイズドセッション講演)

概要

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Due to low thermal activation, modified 9Cr-Mo steel can maintain steady-state deformation during long-term creep. The creep strength of its weldment is lower than that of the base metal. Because of different creep strain rate in the solidified weld metal and heat-affected zone (HAZ), creep deformation in HAZ can be lowered but stress augmented in fine-grained HAZ to cause detrimental Type IV cracks in this zone. In this study, FEM analyses were made on long-term creep of over 60 years in double U groove welded modified 9Cr-Mo steel with typical microstructures in the welded region of the steel taken into consideration. The typical welded region of the steel consists of solidified weld, coarse grain HAZ, fine grain HAZ, interfacial HAZ and base metal. These microstructures were modeled as polycrystal structures having slip systems approximated by rectilinearly anisotropic deformation properties.
一般社団法人日本機械学会の論文
2010-09-23