Development Status of Ni-Fe Base Superalloy for 700 °C Class A-USC Steam Turbine Rotor Application

被引：0
|
作者：
Imano, Shinya [1 ]
Sato, Jun [1 ]
Kamoshida, Hironori [1 ]
Saito, Eiji [2 ]
Kajikawa, Koji [3 ]
Ohsaki, Satoru [3 ]
Takahashi, Tatsuya [3 ]
机构：
[1] Hitachi Ltd, Hitachi Res Lab, 1-1-7 Omika Cho, Hitachi, Ibaraki 3191292, Japan
[2] Hitachi Ltd, Hitachi Power Syst, Chiyoda Ku, Tokyo 1018010, Japan
[3] Japan Steel Works LTD, Muroran Res Lab, Muroran, Hokkaido 0518505, Japan
来源：
ADVANCES IN MATERIALS TECHNOLOGY FOR FOSSIL POWER PLANTS: PROCEEDINGS FROM THE SIXTH INTERNATIONAL CONFERENCE, 2010 | 2011年
关键词：
D O I：
暂无
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
To improve the microstructure stability at temperatures over 700 degrees C and avoid segregation of Nb, we modified the chemical composition of Alloy 706. The modified alloy (FENIX-700) contains lower Nb and higher Al than Alloy 706, is designed as a gamma' (Ni3Al) strengthened alloy without gamma" (Ni3Nb), delta and eta phases using the CALPHAD method. With this modification, the creep temperature capability has improved from 650 degrees C to 700 degrees C or more. The segregation property was also improved. Trial manufacturing of a 760mm phi) forging shaft using a triple melt process and trial melting of a 1050mm ESR ingot were performed using FENIX-700. In this presentation, the results of these trials will be shown and the alloy design of Ni-base welding materials for the welding type rotor (FENIX-700/12%Cr Ferritic Steel) for a 700 degrees C class steam turbine using the CALPHAD method will be also shown.
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页码：423 / 435
页数：13
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