Microstructure and creep resistance of a diffusionally aluminized Ni-base superalloy
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- 作者：Injin Sah ; Sung Hwan Kim ; Changheui Jang
- 关键词：alloys ; surface modification ; creep ; scanning electron microscopy (SEM) ; glow discharge spectrometer
- 刊名：Metals and Materials International
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：22
- 期：6
- 页码：1033-1040
- 全文大小：1,383 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Metallic Materials
Operating Procedures and Materials Treatment - 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
- ISSN：2005-4149
- 卷排序：22
文摘
An aluminide layer was formed on a wrought Ni-base superalloy by the diffusional aluminizing method, which involves a physical vapor deposition of Al followed by two-step heat treatment in vacuum. Microstructural analysis revealed the presence of an aluminide layer, inter-diffusion zone (IDZ), and affected substrate, all of which developed due to the inter-diffusion of deposited Al and elements in the matrix. In addition, a wide carbide free zone, in which grain boundaries were mostly denuded of carbides, was found below the IDZ. Depth profiling analysis using a glow discharge spectrometer confirmed the reduced carbon content in the carbide free zone. At 900 °C, the diffusionally aluminized specimens showed a decrease in creep-rupture life caused by the presence of the carbide free zone. Fracture surface and cross-section microstructure observation confirmed the detrimental effect of the carbide free zone on the creep resistance of the diffusionally aluminized Alloy 617.