<報文>二, 三の高温ガス炉用耐熱合金の熱的諸物性に関する研究

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In order to clarify thermal properties of Incoloy 800,Incoloy 807 and Hastelloy X which hopefully can be usea as materials in high temperature gas reactors, thermal diffusibility, specific heat and thermal conductivity have been measured in the temperature range from 20° to 900℃. The results obtained are as follows. In the differential thermal analysis curve of solution-treated alloys, two exothermic peaks at 550° and 700℃ and an endothermic peak at 850℃ were observed in the heating process and also a decreasing peak between 500〜700℃, increasing peak at 850℃ were observed in the electrical resistivity-temperature curves in the heating process. These abnormal changes of resistivity were not observed in the cooling process. The above mentioned changes in differential thermal analysis and electrical resistivity-temperature curve were caused by precipitation and resolution of carbides. Carbides were M_<23>C_6 in Incoloy 800,Incoloy 807 and was mainly M_6C in Hastelloy X. Temperature changes of thermal properties in the three kinds of alloys were very similar and the values of thermal diffusibility α, specific hcat C_p and thermal conductivity λ were increased with increase of temperature. The small increasing peak between 500〜750℃, and decreasing peak at nearly 800℃ were also observed in α-T, C_p-T and λ-T curves. Average linear expansion coefficient β was monotonously increased with the increase of temperature and the value of β of Hastelloy X was smallest among the three alloys. The hardness of alloys which were aging at 500〜800℃ for 5 hours were larger than that of solution-treated alloys by about 20% and this hardening was caused by precipitation of carbides.
東北大学の論文
1981-03-25

<報文>二, 三の高温ガス炉用耐熱合金の熱的諸物性に関する研究

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