| Abstract |
| The objective of this study is to investigate the reliability of tensile properties for aged cast stainless steels evaluated by small punch (SP) tests. This study conducted standard tensile and SP tests using thermally aged CF8M, which is a type of cast stainless steel, as well as unaged CF8M at ambient temperature. CF8M was thermally aged at 400 ℃ for up to 10000 hours. The test showed that load deflection curves of SP tests properly present the strain hardening and failure characteristics of aged CF8M observed from the engineering stress-strain curves. Total and necking elongations of aged CF8M were reasonably correlated with deflection to final failure and deflection of plastic-instability obtained from the SP tests, respectively. Thus, it is clear that those SP test parameters can be used to evaluate the thermal aging of cast stainless steels. However, yield and tensile stresses of aged cast stainless steel were not reliably correlated with the SP test parameters. (Received June 3, 2013) |
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| Key Words |
| Metals, Aging, Mechanical Properties, Tensile Test, Small-Punch Test |
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