Time- and cycle-dependent crack propagation in Haynes 282

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

卷:658

Article

Saarimaki, Jonas¹  Moverare, Johan J.¹  Colliander, Magnus Hornqvist^2,3 

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

[2] Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden

[3] GKN Aerosp Engine Syst, R&T Ctr, S-46181 Trollhattan, Sweden

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

DOI  :  10.1016/j.msea.2016.01.111

来源: Elsevier

【 摘 要 】

Haynes 282 is a promising superalloy candidate for several high-temperature applications in both aero and land-based gas turbine engines. To study the crack growth behaviour under time-dependent conditions relevant to such applications, a test program was carried out at room temperature up to 700 degrees C with conditions ranging from pure cyclic to sustained tensile loading. At 650 degrees C and high stress intensity factors the crack growth was fully time-dependent for dwell-times of 90 s and longer. At lower stress intensities, the behaviour was mainly controlled by the cyclic loading, even under dwell conditions. The behaviour under dwell-fatigue conditions was well described by a liner superposition model. The main crack growth occurred transgranularly at room temperature and there was a transition in cracking behaviour from cycle dependent transgranular growth to time-dependent intergranular propagation at similar to 45 MPa root m for the high temperature tests. No effect of cyclic frequency could be observed at room temperature, and at lower frequencies the crack growth rate increased with temperature. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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