Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Effect of Deformation Rate on the Small Punch Ductile-Brittle Transition Behavior in Turbine Rotor Steels
Yeong-Han JOOKeiichi SHIMOMURAToshiyuki HASHIDAHideaki TAKAHASHI
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JOURNALS FREE ACCESS

1992 Volume 78 Issue 3 Pages 485-492

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Abstract

The effect of deformation rate on the ductile-brittle transition behavior of temper embrittled turbine rotor steels has been investigated employing a newly developed dynamic small punch (SP) tester. It is shown that the dynamic SP test produces a clear ductile-brittle transition behavior similar to the Charpy V-notch (CVN) impact test. The ductile-brittle transition temperatures determined by fracture energy measurements and by fracture surface observations are higher about 48-90°C than those obtained from the static SP tests. The effect of deformation rate on the relationship between FATTSP and FATTCVN obtained from SP and CVN tests is examined: it is found that as the deformation rate increases to 103 and 2.5×106 times, the value of a, which is a proportionality coefficient in the relationship given by FATTSP=α×FATTCVN, is increased to 0.45 and 0.54, respectively.
From these experimental results, it is implicated that the use of the dynamic SP testing method enhances the predictability of FATTCVN.

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© The Iron and Steel Institute of Japan
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