期刊
ACTA MATERIALIA
卷 95, 期 -, 页码 456-467出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.03.060
关键词
Nickel-based superalloys; Structure/property relationships; Thermal-mechanical fatigue
资金
- Siemens Industrial Turbomachinery AB in Finspang, Sweden
- Swedish Energy Agency, via the Research Consortium of Materials Technology for Thermal Energy Processes [KME-702]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]
- Engineering and Physical Sciences Research Council (EPSRC) of the UK [EP/J013501/1]
- Engineering and Physical Sciences Research Council [EP/J013501/1] Funding Source: researchfish
- EPSRC [EP/J013501/1] Funding Source: UKRI
The thermal-mechanical fatigue (TMF) 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 TMF 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. A greater lower temperature yield stress and thinner slip bands traversing the gamma '-phase - with a concomitant greater resistance to recrystallisation and cracking along them - contribute to the enhanced TMF performance promoted by Si alloying. 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. (C) 2015 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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