タービン軸材の加熱計測試験に関する研究 : 第4報, A形, C′形およびD形たわみの大きさに影響を及ぼす諸因子

概要

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In the heat indication tests, high pressure and medium pressure steam turbine rotor forgings have shown more frequently type A, C' and D deflections compared with low pressure ones. This phenomenon has hitherto been ascribable to the metallurgical properties as these forgings contain some special and carbide-forming alloy elements. In the present experiment, however, it has been clarified by using the heat indication model test apparatus that the one of the causes of the aforesaid phenomenon is the diversity of geometrical shape among the forgings. Additional experiments have shown the effect of : 1. The rates of heating and cooling at the test thermal cycles, 2. Some characteristics of furnace for heat indication test. Thus type A, C' and D deflections can disappear in a certain manner without re-heat-treatment. This is an important fact which suggests that these three deflections do not occure due to the metallurgical properties of forgings.
一般社団法人日本機械学会の論文
1962-01-25