室温,液体窒素温度下におけるオーステナイト系ステンレス鋼SUS304,SUS316L鋼の塑性誘起マルテンサイト変態に及ぼす変形の影響 : X線回折法による変態量の定量測定

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The present study investigates plasticity-induced martensitic transformation in two types of austenitic stainless steels SUS 304 and 316L subjected to uniform tensile stresses at room and liquid nitrogen temperatures. The X-ray diffraction method was used in order to measure volume fractions of transformed α' and ε martensitic phases and to obtain the dependence of the volume fractions of these phases on the applied strain level ε. The difficulty in the measurement of the martensitic phases by the X-ray diffraction method caused by the preferred orientation which had been introduced during the rolling process and during the tensile tests was overcome by the help of Arnell's Method. Two types of target materials, i.e., Cu and Mo for the X-ray source were used to verify the accuracy and reproducibility of the present X-ray diffraction analyses. The results were also compared with those obtained by the saturation magnetization method using VSM, or vibrating-sample magnetometer reported elsewhere. It was revealed that α' was transformed in SUS 304 both at 297 and 77K whereas in SUS 316L only at 77K. Another type of martensitic phase, i.e., ε was transformed in the both steels only at 77K. Almost the same values of the volume fractions of α' and ε phases were obtained by the two types of target materials. The plots of α' volume fraction obtained by the X-ray diffraction methods vs. that by VSM showed a good linear correlation.
社団法人日本機械学会の論文
2006-10-25

室温,液体窒素温度下におけるオーステナイト系ステンレス鋼SUS304,SUS316L鋼の塑性誘起マルテンサイト変態に及ぼす変形の影響 : X線回折法による変態量の定量測定

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