ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A cast nickel based superalloy M963 was coated by high-velocity oxy-fuel (HVOF) sprayingprocess. The effect of HVOF MCrAlY coating on thermo-mechanical fatigue (TMF) and isothermalfatigue (IF) in M963 was studied to understand fatigue life and failure mechanisms in coated anduncoated M963 alloy. Two types of TMF tests, i.e. in-phase (IP) and out-of-phase (OP), wereperformed in temperature range of 450~900°C, and IF tests were conducted at 900°C. It was foundthat the coating had a detrimental effect on fatigue life under OP TMF, while a beneficial effect of thecoating existed under IP TMF and IF. Crack initiation time in the coated specimen was shorter thanthat in the uncoated specimen and the former’s crack density was higher than the latter’s one underOP TMF. The relationship of deformation and fracture response with fatigue life was discussed basedon microscopic analysis
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.23.pdf
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