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首页> 美国政府科技报告 >Effect of Neutron Irradiation on the Titanium Carbide Distribution in Rapidly Solidified Austenitic Stainless Steels of Varying Titanium and Carbon Content
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Effect of Neutron Irradiation on the Titanium Carbide Distribution in Rapidly Solidified Austenitic Stainless Steels of Varying Titanium and Carbon Content

机译：中子照射对不同钛和碳含量的快速凝固奥氏体不锈钢中碳化钛分布的影响

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Titanium modified austenitic stainless steels are one of the prime candidate alloys being examined for irradiation performance for fusion applications. An aspect of considerable importance in the alloy design is the optimum distribution of titanium carbide in the preirradiation microstructure and the changes in distribution that occur upon irradiation. Rapid solidification (RS) techniques are being used to prepare materials, including alloys with increased TiC content, as part of an examination of the utility of RS methods in aiding the development of irradiation resistant materials. This report considers experimental determinations of the titanium carbide distribution in the irradiated alloys, and the role it has to play in the development of the microstructural state. It is shown that the carbides tend to dissolve upon irradiation and in addition, if larger than about 10 nm, cause nickel and silicon segregation sufficient to nucleate another phase on the carbide particle. It has also been determined that very small particles, composed of either TiC or a closely similar phase, precipitate onto dislocations during irradiation, and are associated with very small cavities presumed to be gas bubbles. These results are discussed within the framework of an evolutionary view of the irradiation response, considering the intrinsic value of RS in producing novel microstructures and also homogeneity of the microstructural state, which may be unobtainable by conventional means. (ERA citation 08:011477)

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