镍基单晶高温合金固溶处理制度的研究进展

doi:10.11896/cldb.18090032

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Abstract  Single crystal turbine blades are the key hot end components of aeroengine, which need serve at high temperature for relatively long time. Therefore, single crystal turbine blades should have excellent high temperature mechanical properties, good oxidation resistance and corrosion resistance at high temperature environment. As the preferred material of single crystal turbine blades, Ni based single crystal superalloy has been widely concerned by many researchers in the past few decades. In order to further improve the high temperature mechanical properties of advanced Ni based single crystal superalloys, the content of high refractory elements (such as Re and W) in advanced Ni based single crystal superalloys continuously increased. Meanwhile, typical as-cast single crystal superalloys contain inhomogeneities of composition (severe microsegregation) and microstructure (massive interdendritic precipitations). It should be noteworthy that if the inhomogeneities of composition and microstructure cannot be eliminated by high temperature solution treatment, the mechanical properties and long-term service properties of single crystal superalloys will be significantly deteriorated. Therefore, appropriate solution treatment regimes should be designed for advanced Ni based single crystal superalloys.
    The development of solid solution treatment process can be divided into two stages. The first stage: with regard to 1st generation single crystal superalloys without Re element, the homogenization of microstructure and composition in this kind of alloy can be achieved by solution treated between the γ′-solvus temperature and the initial melting temperature of alloy for a relatively short time. The second stage started from the 2nd generation single crystal superalloy, the content of refractory elements (especially Re element) in single crystal superalloy continuously increased the difficulty of homogenization of composition significantly increased, i.e. both the temperature and time of solution treatment obviously increased. Therefore, the research hotspot of solution treatment regimes of advanced Ni based single crystal superalloy changed from phase transformation temperature and incipient melting temperature of the alloy to the homogenization degree of alloying elements in single crystal superalloy.
    As cast Ni based single crystal superalloys contained numerous interdendritic precipitations and severe microsegregation of alloying elements. Therefore, in order to obtain uniform microstructure and composition, high temperature solution treatment is necessary. Previous studies indicated that the aim of solution treatment at low-temperature stage is to eliminate interdendritic precipitation, and the aim of solution treatment at high-temperature stage is to eliminate/reduce microsegregation degree of alloying elements. With the development of single crystal superalloy, the content of refractory elements in advanced single crystal superalloy (e.g. Re and W) obviously increased. On the one hand, refractory elements had relatively low interdiffusion coefficients in Ni, on the other hand, refractory elements had severe microsegregation in as-cast alloy. Therefore, it is difficult to eliminate microsegregation of refractory elements and design suitable solution treatment regimes. Meanwhile, phase transformation tempe-ratures of single crystal superalloys were also affected by solution treatment regimes.
    In this paper, the research progress of solution treatment regimes of Ni based single crystal superalloy is summarized. Solution treatment regimes of 2nd and 3rd generation Ni based single crystal superalloys are detailed analyzed, and the effects of solution treatment on microstructure and microsegregation are also illustrated. Moreover, the conventional stepwise solution treatment method and newly developed continuous heating solution treatment method are compared. Meanwhile, the remelting solution treatment is also introduced in this paper.

Key words： single crystal superalloy solution treatment microstructure microsegregation

Published: 12 September 2019

CLC number:

TG156

Fund:This work was financially supported by the National Natural Science Foundation of China (51701020, 51631008), Natural Science Foundation of Shaanxi Province of China (2018JQ5139), China Postdoctoral Science Foundation (2016M602735), the Fundamental Research Funds for the Central Universities (310831171004)

About author:: Yanghui Sun received his B.E degree in Shaanxi University of Technology in 2013. He is currently pursuing his Master at the School Material Science and Enginee-ring, Chang'an University under the supervision of associate professor Xiaofeng Zhang. His research has focused on advanced single crystal superalloy.
Cheng Ai, he worked in School of Materials Science and Engineering, Chang'an University as a lecturer. He received his B.E degree and Ph.D. degree in Northwes-tern Polytechnical University (2010) and Beihang University (2016), respectively. His research field is single crystal superalloy. Dr. Ai has published more than 10 papers in SCI journals, e.g. Journal of Alloys and Compounds、Journal of Crystal Growth、Progress in Natural Science: Materials International. Meanwhile, he headed research projects from National Nature Science Foundations of China, National Nature Science Foundations of Shaanxi Province and China Postdoctoral Science Foundation.

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Cite this article:

SUN Yanghui,AI Cheng,ZHANG Xiaofeng, et al. Research Progress on Solution Treatment Regimes of Ni Based SingleCrystal Superalloy[J]. Materials Reports, 2019, 33(21): 3630-3636.

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http://www.mater-rep.com/EN/10.11896/cldb.18090032 OR http://www.mater-rep.com/EN/Y2019/V33/I21/3630

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