발간논문

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Vol.28, No.2, 162 ~ 170, 1990
Title
Effect of Yield Strength on the Subcritical Cracking Property of HY - Steels
김희진H . J . Kim, 성희준H . J . Sung, 조동률D . Y . Cho
Abstract
Characteristics of subcritical cracking(SCC) in HY-steels were studied focussing on the effect of yield strength on SCC property. In order to accelerate the SCC phenomena and thus to shorten the test period, a new SCC test procedure, so called step-loading SCC test, was developed employing single-edge notched(SEN) tensile specimens. Applying this test procedure on the specimens having six different strength levels, it could be demonstrated that HY-steels having a yield strength over 111㎏/㎟(158 ksi) were highly susceptible to SCC but those having a yield strength lower than 83㎏/㎟(118 ksi) were substantially resistant to SCC. Such an improvement in SCC resistant with lower yield strength was accompanied with the change in failure mode from either quasi-cleavage or intergranular to micro-void coalescence fracture.
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