耐熱鋼の研究 (III) : Timken 16-25-6 耐熱鋼のホツト・コールド・ワーク及びコールド・ワーク後の燒戻と歪の變化との關係

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In this report, the effect of "hot-cold work" and "cold work" of Timken 16-25-6, the heat-resisting alloy for gas turbine material, was studied. There are four different compositions in the specimens. Three of them were analysed in the author's first report. (Tetsu to Hagane 1952, Vol.38, No.5) Another one was Timken 16-25-6, but it contained 0.16% nitrogen. After hot forged, these samples were solution-treated at 1150℃ for 1 hour. The work was made at three states of temperature, 650℃, 900℃ and 1000℃, by the Amsler's tensile test machine. The ratio of work was computed as the ratio of reduction of area. After measuring of hardness and inicrostructure, these samples were tempered at 650℃ or 800℃. Then changes of hardness were measured. From the view point of components, when Timken 16-25-6 alloy contained nitrogen, there was effect of "hot-cold work" or "cold work". Material worked at 650℃ had the highest hardness, that worked at 900℃ had next hardness, and that worked at 1000℃ had hardly any effect of work. From the view point of the temperature at which the material was to be used, work-strain (effect of work) did not remain at 800℃, but it remained at 650℃. It seemed that the "cold work" sample kept its high hardness by work-strain chiefly, with acceleration of precipitation-hardening. On the other hand, the "hot-cold work" sample kept its high hardness by the work-strain plus precipitation-hardening.
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耐熱鋼の研究 (III) : Timken 16-25-6 耐熱鋼のホツト・コールド・ワーク及びコールド・ワーク後の燒戻と歪の變化との關係

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