SEDL / STP / STP1204-EB / STP12731S

Estimation of Toughness Degradation by Microhardness and Small Punch Tests

Suzuki, M
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

Eto, M
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

Nishiyama, Y
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

Fukaya, K
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

Isozaki, T
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

Pages: 11    Published: Jan 1993

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Source: STP1204-EB

Abstract

Microhardness and small punch (SP) tests were conducted to improve the reliability of evaluating the ductile-to-brittle transition temperature (DBTT) shift caused by aging (thermal aging, neutron irradiation, cold rolling) using several model alloys (Fe-0.15C alloys and 2¼Cr-1Mo steels). Although evaluation of DBTT by the SP test was good overall, intergranular brittleness could not be detected by SP-DBTT measurement only. By combining other measurements like fractographic observation, however, material degradation can be better evaluated.

Keywords:
small punch test, Fe-0.15C alloy, 2¼Cr-1Mo steel, DBTT, microhardness, intergranular fracture, neutron irradiation, temper embrittlement, transgranular fracture, fractography

Paper ID: STP12731S
Committee/Subcommittee: E10.08
DOI: 10.1520/STP12731S
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