延性のあるオーステナイト鋼の切欠クリープ破断特性

概要

論文の詳細を見る
An austenitic steel with high ductility, SUS 310 S, was found to show remarkable notch strengthening in circumferential V-notched specimens in a 700℃ creep rupture test, resulting in maximum strength at the stress concentration factor of 2〜4. In notched specimens having a notch root radius as small as 0.05 mm, creep fracture occurred as a result of initiation and propagation processes of a main intergranular crack from notch root. But with increasing notch root radius, fine intergranular cracks formed throughout an area ahead of the main crack were found to be involved in a fracture process in addition to the one mentioned above. Finally, discussions were made on the notch strengthening of this steel and two conditions associated with creep stress and structural aspects of the material tested were proposed as responsibie for notch strengthening.
一般社団法人日本機械学会の論文
1990-11-25