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Metals 2019, 9(3), 318; https://doi.org/10.3390/met9030318

An Investigation into Creep Cavity Development in 316H Stainless Steel

1
Department of Engineering and Innovation, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
2
Assessment Technology Group, EDF Energy Nuclear Generation Ltd., Barnett Way, Barnwood GL4 3RS, UK
3
Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, UK
4
ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
*
Author to whom correspondence should be addressed.
Received: 1 February 2019 / Revised: 5 March 2019 / Accepted: 6 March 2019 / Published: 12 March 2019
(This article belongs to the Special Issue Creep and High Temperature Deformation of Metals and Alloys)
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Abstract

Creep-induced cavitation is an important failure mechanism in steel components operating at high temperature. Robust techniques are required to observe and quantify creep cavitation. In this paper, the use of two complementary analysis techniques: small-angle neutron scattering (SANS), and quantitative metallography, using scanning electron microscopy (SEM), is reported. The development of creep cavities that is accumulated under uniaxial load has been studied as a function of creep strain and life fraction, by carrying out interrupted tests on two sets of creep test specimens that are prepared from a Type-316H austenitic stainless steel reactor component. In order to examine the effects of pre-strain on creep damage formation, one set of specimens was subjected to a plastic pre-strain of 8%, and the other set had no pre-strain. Each set of specimens was subjected to different loading and temperature conditions, representative of those of current and future power plant operation. Cavities of up to 300 nm in size are quantified by using SANS, and their size distribution, as a function of determined creep strain. Cavitation increases significantly as creep strain increases throughout creep life. These results are confirmed by quantitative metallography analysis. View Full-Text
Keywords: creep damage; cavitation; small angle neutron scattering; scanning electron microscopy; austenitic stainless steel creep damage; cavitation; small angle neutron scattering; scanning electron microscopy; austenitic stainless steel
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jazaeri, H.; Bouchard, P.J.; Hutchings, M.T.; Spindler, M.W.; Mamun, A.A.; Heenan, R.K. An Investigation into Creep Cavity Development in 316H Stainless Steel. Metals 2019, 9, 318.

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