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On the rejuvenation of crept Ni-Base single crystal superalloys (SX) by hot isostatic pressing (HIP)
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SYSNO ASEP 0510350 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title On the rejuvenation of crept Ni-Base single crystal superalloys (SX) by hot isostatic pressing (HIP) Author(s) Horst, O.M. (DE)
Ruttert, B. (DE)
Bürger, D. (DE)
Heep, L. (DE)
Wang, H. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Theisen, W. (DE)
Eggeler, G. (DE)Number of authors 8 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 758, JUN (2019), s. 202-214Number of pages 13 s. Language eng - English Country CH - Switzerland Keywords Single crystal Ni-Based superalloys ; Creep ; Hot isostatic pressing ; Rejuvenation ; Rafting ; Damage accumulation Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects EF16_025/0007304 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000471737800025 EID SCOPUS 85065550162 DOI 10.1016/j.msea.2019.04.078 Annotation In the present work, we study the effect of HIP rejuvenation treatments on the creep behavior and residual life of a pre-crept single crystal Ni-base superalloy of type CMSX-4. The present work combines miniature creep experiments of precisely oriented [001]tensile creep specimens with HIP treatments and quantitative analysis of scanning and transmission electron micrographs. A HIP-rejuvenation treatment after 5.0% creep pre-strain significantly improves creep strength. However, the microstructural damage induced by the creep pre-deformation could not be fully removed. In a series of sequential creep/HIP/creep-experiments, increasing levels of pre-deformation result in increasing levels of creep rates even after identical HIP-rejuvenation treatments. The memory effect, which causes this phenomenon, is related to an accumulation of permanent microstructural damage, which is not associated with rafting or cavitation. The mechanical results obtained in the present work are interpreted based on microstructural results on the γ/γʼ-microstructure (γ-channel widths and γʼ-size), on the pore population (number density of pores, pore size distributions and pore area fractions)and dislocation substructures which have formed during creep. The results are discussed in the light of previous results reported in the literature. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2020 Electronic address https://doi.org/10.1016/j.msea.2019.04.078
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