Thermal-Mechanical Fatigue Behaviour of a New Single Crystal Superalloy: Effects of Si and Re Alloying
2015 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 95, 456-467 p.Article in journal (Refereed) Published
The mechanical behaviour of a new single crystal superalloy suitable for power generation applications is considered. Effects of alloying with either Si or Re are elucidated. Out-of-phase thermal-mechanical fatigue is emphasised, although to clarify the effects arising some static creep deformation tests are also carried out. A significant Si-effect is found: a modest addition of 0.25 wt. % Si increases the TMF life by a factor of 2. Thinner deformation bands which traverse the γ'-phase are promoted by Si alloying, with a concomitant greater resistance to recrystallization and cracking along them. Alloying with Re, whilst improving the creep behaviour more markedly than Si, does not have such a strong effect on TMF life. The results provide insights into the composition/performance relationships relevant to the TMF performance of single crystal superalloys.
Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 95, 456-467 p.
IdentifiersURN: urn:nbn:se:liu:diva-111640DOI: 10.1016/j.actamat.2015.03.060ISI: 000358626200046OAI: oai:DiVA.org:liu-111640DiVA: diva2:758425
On the day of the defence date the status of this article was Manuscript.
The work has been supported financially by Siemens Industrial Turbomachinery AB in Finspang, Sweden and the Swedish Energy Agency, via the Research Consortium of Materials Technology for Thermal Energy Processes, Grant No. KME-702. In addition, the support from the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU #2009-00971) is also acknowledged. Funding from the Engineering and Physical Sciences Research Council (EPSRC) of the UK is acknowledged under Grant EP/J013501/1 'Multifunctional High Performance Alloys for Extreme Environments'.2014-10-272014-10-272015-08-24Bibliographically approved