Creep lifing methodologies applied to a single crystal superalloy by use of small scale test techniques

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:636

Article

Jeffs, S. P.¹  Lancaster, R. J.¹  Garcia, T. E.² 

[1] Swansea Univ, Inst Struct Mat, Swansea SA2 8PP, W Glam, Wales

[2] Univ Oviedo, IUTA Univ Inst Ind Technol Asturias, Gijon 33203, Spain

关键词: Wilshire equations;    Creep;    Small punch;    Single crystal;   

DOI  :  10.1016/j.msea.2015.03.119

来源: Elsevier

【 摘 要 】

In recent years, advances in creep data interpretation have been achieved either by modified Monkman-Grant relationships or through the more contemporary Wilshire equations, which offer the opportunity of predicting long term behaviour extrapolated from short term results. Long term lifing techniques prove extremely useful in creep dominated applications, such as in the power generation industry and in particular nuclear where large static loads are applied, equally a reduction in lead time for new alloy implementation within the industry is critical. The latter requirement brings about the utilisation of the small punch (SP) creep test, a widely recognised approach for obtaining useful mechanical property information from limited material volumes, as is typically the case with novel alloy development and for any in-situ mechanical testing that may be required. The ability to correlate SP creep results with uniaxial data is vital when considering the benefits of the technique. As such an equation, has been developed, known as the k(SP) method, which has been proven to be an effective tool across several material systems. The current work now explores the application of the aforementioned empirical approaches to correlate small punch creep data obtained on a single crystal superalloy over a range of elevated temperatures. Finite element modelling through ABAQUS software based on the uniaxial creep data has also been implemented to characterise the SP deformation and help corroborate the experimental results. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free