Thermal fatigue crack nucleation in ferritic–martensitic steels before and after neutron irradiation

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• 作者：Belyaeva ; L.A. ; Zisman ; A.A. ; Petersen ; C. ; Potapova ; V.A. ; Rybin ; V.V.
• 关键词：F03 ; F04 ; L04 ; N01 ; R03 ; S06
• 刊名：Journal of Nuclear Materials
• 出版年：2000
• 出版时间：December, 2000
• 年：2000
• 卷：283-287
• 期：Part 1
• 页码：461-464
• 全文大小：653 K

文摘

Thermal fatigue behaviour of the ferritic–martensitic steels MANET-II, 12Cr–1.5NiMo and F82H-mod. have been investigated in the temperature range from 50°C to 350°C and total strain range ≤0.33 % . Crack appearance has been checked after 3×10³, 6×10³ and 10⁴ cycles and has been successively detected in these steels. The thermal fatigue cracks have a transgranular character; sometimes, intergranular cracks are observed in the F82H-mod. steel. A certain correlation of grain size and ferrite content with the thermal fatigue crack peculiarities has been noted. Specimens of MANET-II and 12Cr–1.5NiMo have been irradiated in a WWR-M reactor with a fluence of 1×10²⁵ n m⁻² at a temperature of 300°C and then subjected to thermocyclic loading. It has been established that the neutron irradiation does not significantly affect fatigue crack nucleation in both materials.