Microstructure and creep resistance of a diffusionally aluminized Ni-base superalloy

被引：5
|
作者：
Sah, Injin [1 ]
Kim, Sung Hwan [2 ]
Jang, Changheui [2 ]
机构：
[1] KAERI, VHTR Technol Dev Div, Daejeon 34057, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Nucl & Quantum Engn, Daejeon 34141, South Korea
来源：
METALS AND MATERIALS INTERNATIONAL | 2016年 / 22卷 / 06期
基金：
新加坡国家研究基金会;
关键词：
alloys; surface modification; creep; scanning electron microscopy (SEM); glow discharge spectrometer; SINGLE-CRYSTAL SUPERALLOY; HIGH-TEMPERATURE AIR; ALLOY; 617; HELIUM ENVIRONMENTS; RUPTURE PROPERTIES; HEAT-TREATMENT; OXIDATION; COATINGS; BEHAVIOR; KINETICS;
D O I：
10.1007/s12540-016-6218-z
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 A degrees 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.
引用
收藏
页码：1033 / 1040
页数：8
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