Transient liquid phase bonding of γ′- precipitation strengthened Ni based superalloys for repairing gas turbine components
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- 作者：Jeong Kil Kim ; jeongkil1.kim@doosan.com ; Hae Ji Park ; Deog Nam Shim ; Dong Jin Kim
- 关键词：Bonding ; Diffusion ; Solidification ; Gas turbine
- 刊名：Journal of Manufacturing Processes
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：25
- 期：Complete
- 页码：60-69
- 全文大小：9701 K
- 卷排序：25
文摘
γ′-Precipitation strengthened Ni based superalloys are extensively being accepted for gas turbine components, because these material have excellent mechanical properties, as well as corrosion and oxidation resistance at high temperatures above 1000 °C. Transient liquid phase (TLP) bonding is an essential technique for gas turbine component repair. In this article, TLP bonding characteristics of two types of γ′ precipitation strengthened superalloys − GTD111 solidified directionally and Udimet520 wrought − were investigated to approve this technique for the repair of components. TLP bonding was carried out with an amorphous filler metal in various bonding conditions. The microstructural characterization of the joints was examined through optical microscopy (OM) and electron probe micro-analysis (EPMA). The experimental results showed clearly that TLP joints of these superalloys had different TLP bonding behaviors according to the bonding temperatures, and that microstructures such as dendritic structures and the melting points of the base metals had critical effects on these bonding behaviors.