オーステナイト・ステンレス鋼の高温特性について

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In order to present some information for design criteria about high-temperature properties of austenitic stainless steels, some results of high-temperature mechanical test which had been previously reported through our research were summurized discussed. Six standard type austenitic stainless steel rolled bars of AISI 304, 316, 321, 347 and 318 were used for high-temperature mechanical testing, such as, short-time tensile, creep-rupture, fatigue tests and testing for embrittlement associated with the strctual change in these alloys. Of course, it depends on the service condition of the materials which property should be taken for the allowable stress. In the case of stainless steels, however, the allowable stress in lower temperature range can be usually obtained form yield strength, and higher temperature range, from limiting-creep stress. As it has been shown that the temperature dependence of fatigue strength of these alloys is not so remarkable as that of limiting-creep stress, fatigue strength should be first considered as allowable stress in lower temperature range. As the caracteristics of austenitic stainless steels it was recognized that the ratio of the tensile, fatigue and rupture strength to the yield strength or limiting-creep stress was relatively high. Consideration for embrittlement at grain boundary which may be predominant in some austenitic alloys must be taken, while setting up the criterion on load-carring-ability as described in the above. Type 316, 318 and 310 stainless steels are liable to show intergranular brittlement due to massive precipitates of chromium carbide, sigme phase or other intermetallic compounds at grain boundaries. Grain boundary precipitation affects the alloys, making them more brittle and promoting the fructure at grain boundary in rupture testing.
社団法人日本材料学会の論文
1960-02-15

オーステナイト・ステンレス鋼の高温特性について

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