Journal of the Japan Institute of Metals and Materials
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
Regular Article
Effects of Nickel, Phosphorous and Sulfur on the Post-Irradiation Annealing Behavior of Irradiation Hardening in Fe-0.2 mass% C-0.3 mass% Cu Model Alloys
Hiroshi ShibamotoAkihiko KimuraMasayuki HasegawaHideki Matsui
Author information
JOURNAL FREE ACCESS FULL-TEXT HTML

2020 Volume 84 Issue 2 Pages 37-43

Details
Abstract

Micro-Vickers hardness and positron lifetime were measured after 1 MeV proton irradiation to a fluence of 3 × 1017 ions/cm2 at below 80℃ and post-irradiation isochronal annealing to 650℃ to investigate the effects of nickel (Ni), phosphorous (P) and sulfur (S) on the irradiation hardening of Fe-0.2 mass% C-0.3 mass% Cu model alloy. With increasing the Ni content to 0.6 mass%, irradiation hardening was increased, while a further increase to 1 mass% resulted in a small reduction. The addition of 0.05 mass% P increased the irradiation hardening of the model alloys irrespective of the addition of 0.6 mass% Ni, while the addition of 0.05 mass% S showed almost no effect on the hardening. Positron lifetime measurements revealed that the intensity of long-lifetime component, namely the number density of microvoids, increased and decreased for the alloy added with P and S, respectively. However, no significant effect of Ni content on the long-lifetime component was observed. Post-irradiation anneal-hardening was large and became a maximum at around 350-375℃ in most of the alloys studied. The addition of 0.6 mass% Ni caused almost no effect on the annealing behavior, while further addition of 0.05 mass% P reduced the hardness change by the annealing to 400℃. During post-irradiation annealing to around 400℃, the long-lifetime component increased in the alloy with P, but it was so small in the alloy with S or manganese (Mn). These suggest that P enhances the growth of the microvoids but S as well as Mn suppress it.

Fig. 4 Annealing behavior of ΔHV of each alloy where the ΔHV is estimated to be a subtraction of the hardness of unirradiated alloy after a given annealing from the hardness of the post-irradiation annealed alloy:(a) Fe-C-Cu alloy and (b) Fe-C-Cu-Ni alloy. Fullsize Image
Content from these authors
© 2020 The Japan Institute of Metals and Materials
Next article
feedback
Top