オーステナイト系ステンレス鋼のランプチャー強度と電顕直接観察

概要

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To obtain the high temperature strength data of Austenitic stainless steels, creep rupture tests at 650℃ for as long as 1 0000 hours are in progress with five steels-two 18Cr-12Ni-2.5Mo type steels, one 18 Cr-12Ni-0.25Ti type steel, and two 18Cr-12Ni-1Nb type steels, heat treated at 1100℃ for 1 hour and water-quenched. Three specimens were tested under each stress level to investigate the scattering of data. The results obtained from the experiments which were conducted for 3000 hours are reported in this paper. The change of the tensile and the impact properties of these steels during the aging and creep at 650℃ were also investigated. The impact values of these steels fell to one half of its initial values during several thousand hours of aging at 650℃ and the 18Cr-12Ni-2.5Mo steel showed a larger drop of impact value and more increase in tensile strength during the aging than the two other types of steel. To study the strengthening mechanism in austenitic stainless steels at elevated temperature, the precipitation and dislocation behaviour during the aging and creep of a 18Cr-12Ni-2.5Mo and a 18Cr-12Ni-1Nb steel were observed by transmission electron microscopy. In the specimens of both steels, solution-treated at 1 100℃, the dislocation density was rather high because of the thermal strain produced in the quenching in water.
社団法人日本材料学会の論文
1964-03-15