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|Title: ||Effects of oxidation on fatigue crack initiation and propagation in an advanced disc alloy|
|Authors: ||Jiang, Rong|
Reed, Philippa A.S.
|Issue Date: ||2015|
|Publisher: ||© The authors. Published by Institute of Materials, Minerals and Mining|
|Citation: ||JIANG, R. ...et al., 2015. Effects of oxidation on fatigue crack initiation and propagation in an advanced disc alloy. IN: Parsons 2015: The 9th International Charles Parsons Turbine and Generator Conference, Loughborough, 15-17th Sept.|
|Abstract: ||Powder metallurgy Ni-based superalloys are widely used for aeroengine turbine disc application due to their exceptional strength properties at elevated temperatures, good fatigue and creep performance as well as excellent corrosion and oxidation resistance. However, oxygen enhanced fatigue crack initiation and intergranular propagation at elevated temperatures in air is commonly observed in aeroengine turbine disc superalloys under dwell fatigue testing conditions [1-7], and this phenomenon is usually ascribed to either decohesion/reduction in cohesion strength of grain boundary (GB) due to dynamic embrittlement [8, 9] or GB oxide cracking caused by stress assisted grain boundary oxidation (SAGBO) [5, 10-12]. Although the influence of oxygen on fatigue crack initiation and propagation has been intensively studied, the underlying mechanism for the oxygen-assisted fatigue failure process is still not clear due to the complex composition of disc alloy and the interaction between environmental attack and mechanical load. In this study, fatigue tests were conducted on the Low Solvus, High Refractory (LSHR) alloy designed by NASA for turbine disc application, with a particular focus on studying the influence of the formation of GB oxides on fatigue crack initiation and propagation processes.|
|Description: ||This is a conference paper.|
|Sponsor: ||This paper was supported by the EPSRC (Grant EP/K027271/1) of the UK and China Scholarship Council.|
|Version: ||Accepted for publication|
|Publisher Link: ||https://www.iom3online.org/iom/frontend/reg/thome.csp?pageID=196094&ef_sel_menu=1490&eventID=423&eventID=423|
|Appears in Collections:||Conference Papers and Presentations (Mechanical, Electrical and Manufacturing Engineering)|
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