耐熱材料として開発した 12mass%Cr-15mass%Mn オーステナイト鋼の高温強度と靱性の改善

概要

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For the development of a high Mn-Cr austenitic steel as one of the heat resisting materials, the present authors have investigated the high temperature strength, toughness and mirostructural phase instability of 12%Cr-15%Mn steels. High content of carbon (0.1 to 0.2 mass%C) formed the large amount of coarse precipitates of the type M_<23>C_6 carbide on grain boundaries and within grains after a long-term aging. These precipitates caused the intergranular and/or quasi-cleavage fracture and deteriorated the toughness. It was clarified that, for the improvement of the toughness, the lowering of carbon content to 0.02mass%C was necessary. The toughness and high temperature strength of the 12%Cr-15%Mn steels were compared and discussed with those of the ordinary SUS316 steel. Creep-rupture strength of the present materials was also compared with that of the TENELON which had been developed by Brady et al (US steel) as a high Mn austenitic heat resisting steel. The creep-rupture strength of the 12%Cr-15%Mn steel was superior to those of the type 316 steel and the TENELON.
社団法人日本鉄鋼協会の論文
1995-12-01