Influence of overloads on dwell time fatigue crack growth in Inconel 718

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:612

Article

Saarimaki, Jonas¹  Moverare, Johan^1,2  Eriksson, Robert¹  Johansson, Sten¹ 

[1] Linkoping Univ, Dept Management & Engn, Div Engn Mat, SE-58183 Linkoping, Sweden

[2] Siemens Ind Turbomachinely AB, Mat Technol, SE-61283 Finspang, Sweden

关键词: Nickel based superalloys;    Fatigue;    Fracture;    Mechanical characterization;    Electron microscopy;   

DOI  :  10.1016/j.msea.2014.06.068

来源: Elsevier

【 摘 要 】

Inconel 718 is one of the most commonly used superalloys for high temperature applications in gasturbines and aeroengines and is for example used for components such as turbine discs. Turbine discs can be subjected to temperatures up to similar to 700 degrees C towards the outer radius of the disc. During service, the discs might start to develop cracks due to fatigue and long dwell times. Additionally, temperature variations during use can lead to large thermal transients during start-up and shutdown which can lead to overload peaks in the normal dwell time cycle. In this study, tests at 550 degrees C with an overload prior to the start of each dwell time, have been performed. The aim of the investigation was to get a better understanding of the effects of overloads on the microstructure and crack mechanisms. The microstructure was studied using electron channelling contrast imaging (ECCI). The image analysis toolbox in Matlab was used on cross sections of the cracks to quantify: crack length, branch length, and the number of branches in each crack. It was found that the amount of crack branching increases with an increasing overload and that the branch length decreases with an increasing overload. When the higher overloads were applied, the dwell time effect was almost cancelled out. There is a strong tendency for an increased roughness of the crack path with an increasing crack growth rate. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free