کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1569735 1514265 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of transient thermal cycles in a supercritical water-cooled reactor on the microstructure and properties of ferritic-martensitic steels
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Effect of transient thermal cycles in a supercritical water-cooled reactor on the microstructure and properties of ferritic-martensitic steels
چکیده انگلیسی
Microstructural and mechanical property changes in modified 9Cr-1Mo and HCM12A ferritic-martensitic steels resulting from short-duration thermal transients that occur during loss of feedwater flow events in a supercritical water reactor (SCWR) were studied. Specimen blanks were exposed to reference transients with 810 and 840 °C maximum temperatures using a thermal cycle simulator, and the subsequent microstructure, hardness, and creep-rupture strength were evaluated. Exposure to five consecutive cycles at either temperature resulted in no significant changes - only very slight indications of overtempering. Subsequent study of a wider variety of transient conditions showed that significant ferrite-to-austenite transformation occurred during thermal transients whose maximum temperature exceeded 860 °C, or during transients with holds exceeding 10 s at 840 °C maximum temperature. The subsequent presence of untempered martensite in the microstructure, coupled with severe overtempering, resulted in an order of magnitude decrease in creep-rupture strength at 600 °C. The findings were consistent with measured Ac1 temperatures for the two steels and the dependence of Ac1 on heating rate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 355, Issues 1–3, 1 September 2006, Pages 104-113
نویسندگان
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