18Cr-8Ni ステンレス鋼のクリープき裂の発生と伝ぱ(<小特集>高温強度小特集)

概要

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An experimental study was carried out in order to investigate the behavior of creep crack initiation and propagation. The creep test was done by using center notched plate specimens of an 18 Cr-8 Ni austenitic stainless steel (SUS 304 HS) at the temperature of 650℃. The fractography of ruptured specimens was observed by means of a scanning electron microscope. As a result, the crack propagation rate was roughly given by a power function of net section stress ; dl/dt= cσ^<α_c> _<net>, where c and α_c are constants. The value of exponentα_c increased in correspondence with the change in fracture mode from the grain boundary cracking to the transgranular cracking as the net section stress increased. It was also found that the rate of notch opening displacement (NOD) was proportional to the crack propagation rate. The rate of NOD is considered to have some connection with the strain rate in the vicinity of a crack tip.
社団法人日本材料学会の論文
1974-03-15