Influence of Secondary Orientation on Competitive Grain Growth of Nickel-Based Superalloys
Zhang Xiaoli1; Feng Li2; Yang Yanhong3; Zhou Yizhou3; Lu Guiqun1
Corresponding AuthorLu Guiqun(
AbstractDirectional solidification (DS) has been widely used to produce aero-engine and gas turbine blades of nickel-based superalloys. The preferred crystallographic orientation of nickel-based superalloys is [001], so the [001] columnar-grain structure can form after DS. Due to the low Young's modulus and the elimination of transverse grain boundaries, the [001] columnar-grain structure has beneficial mechanical behavior. The competitive grain growth dominates the production of columnar grains. There are two views about competitive grain growth, which are consistent for diverging grains but not consistent for converging grains. In the case of convergence of the first view, the grain boundary (GB) was parallel to the favorably aligned dendrites, which indicates that the favorably aligned grain cannot be eliminated. For converging grains of the second view, not only the favorably aligned dendrites could block unfavorably aligned ones, but also the unfavorably aligned dendrites could block favorably aligned ones. Thus, the converging grain boundary moved from unfavorably aligned grain to favorably aligned grain. Finally, the favorably aligned grain may be eliminated. The study about the two views was carried out in the case of the same secondary orientation but did not taken into account the secondary orientation. Up to now, the literatures about the effect of secondary dendrite orientation on competitive growth is rarely and their views contradict with each other. In this work, the bi-crystal and ter-crystal plates with different secondary orientations were produced to study the influence of secondary orientation on competitive grain growth. For the bi-crystal with the same primary orientation, as the secondary GB angle increased, the GB was nearly at the middle of the plate sample, which indicated that the competitive grain growth was weak and could be neglected. For the ter-crystal with different primary orientations, not the secondary orientation but the primary orientation could obviously affect competitive grain growth. In the case of converging grains, the change of secondary dendrite orientation had no effect on the competitive growth behavior and grain growth rate; the favorably and unfavorably aligned dendrites could block each other, which disagreed with Walton-Chalmers model and in good agreement with the results of Zhou. In the case of diverging grains, the result agreed with Walton-Chalmers model and Zhou's result.
KeywordNi-based superalloys directional solidification competitive grain growth secondary orientation
Funding OrganizationNational Natural Science Foundation of China ; Key Research and Development Program of Ningxia ; Natural Science Foundation of Ningxia
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[51701210] ; National Natural Science Foundation of China[21865001] ; Key Research and Development Program of Ningxia[2019BDE03016] ; Natural Science Foundation of Ningxia[2018AAC03250]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000538639000005
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLu Guiqun
Affiliation1.North Minzu Univ, Sch Mat Sci & Engn, Yinchuan 750021, Ningxia, Peoples R China
2.Shengyang Polytech Coll, Elect Engn, Shenyang 110045, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Zhang Xiaoli,Feng Li,Yang Yanhong,et al. Influence of Secondary Orientation on Competitive Grain Growth of Nickel-Based Superalloys[J]. ACTA METALLURGICA SINICA,2020,56(7):969-978.
APA Zhang Xiaoli,Feng Li,Yang Yanhong,Zhou Yizhou,&Lu Guiqun.(2020).Influence of Secondary Orientation on Competitive Grain Growth of Nickel-Based Superalloys.ACTA METALLURGICA SINICA,56(7),969-978.
MLA Zhang Xiaoli,et al."Influence of Secondary Orientation on Competitive Grain Growth of Nickel-Based Superalloys".ACTA METALLURGICA SINICA 56.7(2020):969-978.
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