タービン軸材の加熱計測試験に関する研究 : 第2報, 軸材の材質的性質に基因するたわみの再現とその成因について

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  • Study on the Heat Indication Test of Steam Turbine Rotor Forgings : 2nd Report, On the Experimental Reproductions and Causes of Deflections Attributable to the Metallurgical Properties of Turbine Shaft Forgings
  • タービンジクザイ ノ カネツ ケイソク シケン ニ カンスル ケンキュウ 2

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In the 1st report, the deflections which are observed at the time of the heat indication test of turbine shafts were classified into five basic types A, B, C, D and C'. In this report, certain results of the aforesaid model test using subsize shafts which were given some asymmetry in the matallurgical properties by the heat treatment and of basic experimental studies are mentioned as follows : (1) The model shafts normalized through eccentric cooling showed the type C deflection convexly to the side of faster cooling. (2) The model shafts tempered with eccentric heating showed the type C deflection convexly to the side of tempering at higher temperature. And in these two cases, no deflections other than type C were observed. (3) The model shaft with extremely eccentric segregation did not show any deflection. In addition, by analysing physical properties of the actual shaft forgings showing type C deflection and conducting some high precision measurements, it has been revealed that the cause of type C deflection is asymmetric distribution of Mo dissolved in the matrix of the forgings.

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