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K. D. H. Bhadeshia

Bio: K. D. H. Bhadeshia is an academic researcher. The author has contributed to research in topics: Embrittlement & Helium. The author has an hindex of 1, co-authored 1 publications receiving 17 citations.

Papers
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01 Jun 2006
TL;DR: In this article, a quasi-chemical model is developed to calculate the entropy of a steel/helium system, and the steady state concentrations of dissolved helium are found to be too low for such effects to manifest.
Abstract: One of the major problems in building a future fusion power station is the development of suitable structural materials. These materials will be exposed to high energy neutron bombardment, with consequent changes in their mechanical properties – embrittlement, hardening and swelling, for example. A missing link in modelling these effects is an effective treatment of the nucleation of voids under irradiation. These voids are initially stabilised by transmutation helium but, once formed, grow by vacancy accumulation. In this paper, a quasi-chemical model is developed to calculate the entropy of a steel/helium system. Although a substantial contribution from quasi-chemical effects might be expected, the steady state concentrations of dissolved helium are found to be too low for such effects to manifest. The steady state concentration of dissolved helium is low in absolute terms, but the resulting supersaturation is very high, making it reasonable to assume that all available nucleation sites are inst...

20 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the response of a nanostructured ferritic alloy to He implantation and post-irradiation annealing (PIA) at 750°C was characterized by atom probe tomography and transmission electron microscopy.

65 citations

Journal ArticleDOI
TL;DR: In this article, two 9Cr-ODS steels with the same nominal composition were consolidated by hot isostatic pressing (HIP) and spark plasma sintering (SPS), and the results showed a bimodal grain size distribution.

40 citations

Journal ArticleDOI
TL;DR: In this article, a phenomenological model based on kinetic rate equations is developed to describe homogeneous nucleation and growth of helium bubbles in neutron irradiated reduced activation ferritic/martensitic (RAFM) steels.

34 citations

Journal ArticleDOI
TL;DR: Grain boundary and grain size effects on He bubble distribution and evolution were investigated by He implantation into nanometer-size-grained T91 obtained by Surface Mechanical Attrition Treatment (SMAT) and the conventional coarse-grain T91 as discussed by the authors.

19 citations

Journal ArticleDOI
TL;DR: The material testing Reactor BR2 of SCK·CEN has a beryllium matrix which has been replaced in 1995 as mentioned in this paper, and pieces of this matrix, which were irradiated over a period of 15 years at about ±50°C up to a fast neutron fluence (E ǫ> 1.MeV) of 4.2

19 citations