Microstructural evolution and deformation features in gas turbine blades operated in-service

被引：54

作者：

Sun, Fei ^{[1
]}

Tong, Jinyan ^{[2
]}

Feng, Qiang ^{[2
,3
]}

Zhang, Jianxin ^{[1
]}

机构：

[1] Shandong Univ, Key Lab Liquid Struct & Hered Mat, Minist Educ, Jinan 250061, Peoples R China

[2] Univ Sci & Technol Beijing, Natl Ctr Mat Serv Safety, Beijing 100083, Peoples R China

[3] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 618卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Gas turbine blades; Superalloy; Carbide; Dislocation; Transmission Electron Microscope (TEM); NICKEL-BASE SUPERALLOY; INTERFACIAL DISLOCATION NETWORKS; LOW-CYCLE FATIGUE; SHEAR CREEP DEFORMATION; SINGLE-CRYSTALS; TEMPERATURES; MECHANISM; DAMAGE; PARTICLES; STRESS;

D O I：

10.1016/j.jallcom.2014.08.246

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The nickel based superalloy GH4037 is employed in gas turbine blades because of its high temperature strength and oxidation resistance. Microstructural evolution and deformation features in gas turbine blades after 1600 h service have been investigated by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The microstructure of blade changes according to complex and comprehensive temperature and stress fields applied on it. Microstructural observations show that minor carbide precipitates dispersedly precipitate in the matrix. Two MC decomposition reactions occur: MC + gamma -> M23C6 + gamma' and MC + gamma M23C6 + eta. Blocky, closely spaced M23C6 particles continuously distribute along grain boundaries. The main deformation features, such as slip bands, APB-coupled dislocation pairs, stacking faults bound by partial dislocations and deformation twinning, have also been analyzed in terms of fundamental deformation mechanisms and environmental effects. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：728 / 733

页数：6

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