316 ステンレス鋼の疲れ強さにおよぼす加工熱処理の影響

概要

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The fatigue strength at room temperature and microstructure of the type 316 austenitic stainless steel with and without various thermo-mechanical treatments were investigated and the test results by a ultrasonic fatigue testing machine were compared with that by a conventional tension-compression fatigue testing machine. The 10^6 cycle fatigue strength of type 316 steel increased about 30% by the tensile cold work of 30%, and moreover by the aging treatment of 30hr at 700℃ after 20% cold work about a 50% increase of 10^6 cycle fatigue strength was obtained comparing with that of the solution treated steel. These fotigue strengths, however, are a little smaller than that obtained by the treatment, 20% cold working followed by aging of 24hr at 480℃ and 216hr at 700℃, which was proposed by Garofalo. Based on the results of the microstructural survey, it was suggested that the high dislocation density and fine and homogeneous distribution of precipitated M_<23>C_6 carbide contribute to the strengthening of the thermo-mechanical treated steels. The S-N curves both by ultrasonic and magnetic fatigue testing machines showed an almost similar tendency. Therefore, the advantage of ultrasonic fatigue testing machine in time-saving of the testing of type 316 steel was confirmed.
社団法人日本鉄鋼協会の論文
1975-05-01