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Title: Small punch test evaluation of intergranular embrittlement of an alloy steel

Abstract

The ductile-brittle transition temperature in steel is commonly determined using Charpy V-notch impact specimens as specified by ASTM E23-81. In some specific cases, however, the use of this standardized test specimen may be impractical, if not impossible. For instance, it is well known that ferritic steels show a substantial degradation of the mechanical properties after long time exposure to an irradiation environment. Because of the increase in strength and the reduction in ductility due to neutron irradiation, the Charpy V-notch transition temperature is raised causing concern from a safety point of view. To study these radiation effects, a test specimen much smaller than the standard Charpy V-notch specimen would be extremely desirable for two reasons. First, to study neutron damage small specimens take less space within a reactor. Secondly, the damage achieved in simulation experiments, such as proton or electron accelerators, is limited to small penetration depths. Several efforts on the development of such a small test specimen, similar to that used to determine the ductility of sheet metal, as recommended by ASTM E643-78, have been described in the literature. The paper reports on correlations between small punch (SP) and Charpy V-notch (CVN) test results obtained on temper-embrittled NiCr steel.more » The ductile-brittle transition temperature (DBTT) with intergranular embrittlement being induced by grain boundary segregation of specific impurities was determined. The relation between test results discussed in terms of the micromechanisms of intergranular cracking. It is suggested that in radiation embrittlement investigations similar correlations may be obtained.« less

Authors:
; ;
Publication Date:
Research Org.:
Ames Laboratory, Iowa State University, Ames, Iowa
OSTI Identifier:
6461828
Resource Type:
Journal Article
Journal Name:
Scr. Metall.; (United States)
Additional Journal Information:
Journal Volume: 17:12
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL-CHROMIUM STEELS; CHARPY TEST; CRACK PROPAGATION; DAMAGING NEUTRON FLUENCE; DUCTILE-BRITTLE TRANSITIONS; EMBRITTLEMENT; PHYSICAL RADIATION EFFECTS; CORRELATIONS; GRAIN BOUNDARIES; IMPURITIES; IRRADIATION; NEUTRON FLUX; SHEETS; TRANSITION TEMPERATURE; ALLOYS; CHROMIUM ALLOYS; CRYSTAL STRUCTURE; DESTRUCTIVE TESTING; IMPACT TESTS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS TESTING; MECHANICAL TESTS; MICROSTRUCTURE; NEUTRON FLUENCE; NICKEL ALLOYS; NICKEL STEELS; PHYSICAL PROPERTIES; RADIATION EFFECTS; RADIATION FLUX; STEELS; TESTING; THERMODYNAMIC PROPERTIES; 360106* - Metals & Alloys- Radiation Effects

Citation Formats

Baik, J M, Buck, O, and Kameda, J. Small punch test evaluation of intergranular embrittlement of an alloy steel. United States: N. p., 1983. Web. doi:10.1016/0036-9748(83)90373-3.
Baik, J M, Buck, O, & Kameda, J. Small punch test evaluation of intergranular embrittlement of an alloy steel. United States. https://doi.org/10.1016/0036-9748(83)90373-3
Baik, J M, Buck, O, and Kameda, J. 1983. "Small punch test evaluation of intergranular embrittlement of an alloy steel". United States. https://doi.org/10.1016/0036-9748(83)90373-3.
@article{osti_6461828,
title = {Small punch test evaluation of intergranular embrittlement of an alloy steel},
author = {Baik, J M and Buck, O and Kameda, J},
abstractNote = {The ductile-brittle transition temperature in steel is commonly determined using Charpy V-notch impact specimens as specified by ASTM E23-81. In some specific cases, however, the use of this standardized test specimen may be impractical, if not impossible. For instance, it is well known that ferritic steels show a substantial degradation of the mechanical properties after long time exposure to an irradiation environment. Because of the increase in strength and the reduction in ductility due to neutron irradiation, the Charpy V-notch transition temperature is raised causing concern from a safety point of view. To study these radiation effects, a test specimen much smaller than the standard Charpy V-notch specimen would be extremely desirable for two reasons. First, to study neutron damage small specimens take less space within a reactor. Secondly, the damage achieved in simulation experiments, such as proton or electron accelerators, is limited to small penetration depths. Several efforts on the development of such a small test specimen, similar to that used to determine the ductility of sheet metal, as recommended by ASTM E643-78, have been described in the literature. The paper reports on correlations between small punch (SP) and Charpy V-notch (CVN) test results obtained on temper-embrittled NiCr steel. The ductile-brittle transition temperature (DBTT) with intergranular embrittlement being induced by grain boundary segregation of specific impurities was determined. The relation between test results discussed in terms of the micromechanisms of intergranular cracking. It is suggested that in radiation embrittlement investigations similar correlations may be obtained.},
doi = {10.1016/0036-9748(83)90373-3},
url = {https://www.osti.gov/biblio/6461828}, journal = {Scr. Metall.; (United States)},
number = ,
volume = 17:12,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 1983},
month = {Thu Dec 01 00:00:00 EST 1983}
}