公开(公告)号：US20160230594A1

公开(公告)日：2016-08-11

申请号：US14995668

申请日：2016-01-14

Applicant: Mitsubishi Hitachi Power Systems, Ltd.

Inventor： Hiroshi Yamauchi ,  Takeshi Kudo ,  Kenji Yashirodai

IPC: F01D25/00 ,  B24C1/10

CPC classification number: F01D25/007 ,  B24C1/10 ,  C23C18/1605 ,  C23C18/165 ,  C23C18/1651 ,  C23C18/1653 ,  C23C18/1662 ,  C23C18/1806 ,  C23C18/32 ,  C23C18/42 ,  C23C18/52 ,  C25D5/022 ,  C25D5/12 ,  C25D5/36 ,  C25D7/00 ,  C25D7/008 ,  C25D15/00 ,  F01D5/28 ,  F01D5/3092 ,  F05D2230/90 ,  F05D2300/142

Abstract: Provided is a steam turbine and a surface treatment method for the steam turbine with which high resistance to environmentally assisted cracking is achieved while also inhibiting the decrease in the effect of compressive residual stress given by shot peening and the complication of the process/treatment. A compressive stress layer to which compressive residual stress has been given by means of shot peening is formed at the surface of a structure (engagement part between a rotor and rotor blades) constituting the steam turbine. Further, a coating layer is formed to cover the surface of the compressive stress layer by means of plating.

Abstract translation: 本发明提供一种蒸汽轮机和表面处理方法，用于实现高耐环境破坏的蒸气轮机，同时还抑制喷丸硬化施加的压缩残余应力的影响以及加工/处理的复杂性。 在构成蒸汽涡轮机的结构（转子和转子叶片之间的接合部分）的表面处形成有通过喷丸硬化赋予压缩残余应力的压应力层。 此外，通过电镀形成覆盖压应力层的表面的涂层。