ニッケル基二元合金の耐熱に関する二三の研究

抄録

The paper presents data of solid solution hardening, work hardening recrystallization softening temperature and oxidation resistance for Ni-binary solid solution. The samples made from Mond nickel(99.85%) with metallic additions of highest grades by means of a Tammann furnace melting were used for the above examinations, the results being as follows: (1) The alloying elements were as listed hereunder in order of decreasing potency of solidsolution hardening in water quenched alloys; Ti,Si,Mo,Al,Mn, Cr, W,Fe,Cu and Co. (2) The solidsolution hardening is caused by the distortion of Ni-lattice, so that the greater the difference in atomic radius between the added element and Ni,the greater the hardening effect. (3) The less the hardness of alloy before cold-working, the greater the work-hardening effect, that is, the larger the amount of the alloying element and the greater the difference in atomic radius between the added element and Ni, the less the work-hardening effect. (4) In most cases the softening temperature is raised by the increase of the amount of alloying elements,especially by small amount of Ti- or Al-addition. The softening temperature is raised up to 800° in the alloys with above 10% of Mo, above 15% of W or above 18% of Cr, while it is lowered by Cu-addition. (5) The oxidation resistance is generally reduced by alloying elements, especially by Fe or Mo, but Cu or Si scarcely affects it. In alloys with above 10% of Cr the oxidation resistance is extremely improved.