Abstract
The precipitation behavior of TaC in austenite was studied to improve mechanical properties of a reduced-activation steel, Type F-82H (an 8%Cr–2%W steel). The solubility product of TaC in austenite of Type F-82H was determined as a function of temperature and was 70% larger than that of γ-Fe. On metallurgical examination, the following was found: (1) The nucleation and growth of austenite grains and/or the reverse α → γ transformation accelerated the precipitation of fine particles of TaC, and the fine precipitates suppressed the further growth of the austenite grains. (2) When homogenizing at 1523 K previously, coarse austenitic grains were observed by heating at 1223–1323 K as compared with the grains after directly heating of the hot-rolled plate, while the solubility product itself was roughly independent of the homogenizing treatment.
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