Failure: Chapter 8

Ray, Ashok K and Roy, Nilima and Dash, Byomkesh and Ranganath, V R and Tiwari, Y N and Goswami, B and Dwarakadasa, E S (2010) Failure: Chapter 8. In: Introduction to the science and engineering of materials; MSE 209. Uinversity of Virginia, USA.

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High temperature load controlled fatigue, hot tensile and accelerated creep properties of thermal barrier coated (TBC) Superni C263 alloy used as a candidate material in combustor liner of aero engines are highlighted in this paper. Acoustic emission technique has been utilised to characterise the ductile-brittle transition teperature the bond coat. Results revealed that the DBTT (ductile to brittle transition temperature) of this bond coat is around 923 K, which is in close proximity to the value reported for CoCrAlY type of bond coat. Finite element technique, used for analysing the equivalent stresses in the bond coat well within the elastic limit, revealed the highest order of equivalent stress at 1073 K as the bond coat is ductile above 923 K. The endurance limit in fatigue and the life of TBC coated composite under accelerated creep conditions are substantially higher than those of the substrate material. Fractographic features at high stresses under fatigue showed intergranular cleavage whereas those at low stresses were transgranular and ductile in nature. Delamination of the bond coat and spallation of the TBC at high stresses during fatigue was evident. Unlike in the case of fatigue, the mode of fracture in the substrate at very high stresses was transgranular whereas that at low stresses was intergranular in creep.

Item Type:Book or NML Publication
Official URL/DOI:DOI:20050120-1007
Uncontrolled Keywords:science and engineering; materials
Divisions:Material Science and Technology
ID Code:5706
Deposited By:Dr. A K Sahu
Deposited On:04 Jul 2012 15:45
Last Modified:05 Jul 2012 10:40
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