Mitsubishi Heavy Industries Technical Review
    Vol. 52 No. 2 (2015)   Mitsubishi Hitachi Power Systems
    Technical Papers

    Alloy Design and Innovative Manufacturing Technology of High-Strength Ni-base Wrought Alloy for Efficiency Improvement in Thermal Power Plants

    Shinya Imano,
    Jun Sato,
    Hironori Kamoshida,
    Takashi Shibayama,
    Atsuo Ota

    Mitsubishi Hitachi Power Systems, Ltd. (MHPS) has established an alloy design method capable of reducing the time and cost required to develop Ni-base superalloys used in thermal power plants, as well as mitigating the risks resulting from the trial manufacturing of large items. By using this method, we have developed a highly-manufacturable material available for 800°C-class steam turbines, and large Ni-base disk material used for gas turbines. An examination of their applicability to actual equipment is now under way. By controlling their metallographic structure, we have also developed a manufacturing process to dramatically improve the manufacturability of high-strength superalloys. Based on this process, the applicability of high-strength wrought alloy for aircraft engines to thermal power plants is presently under examination.