Interfacial Reaction Between Nickel-Based Superalloy K417G and Oxide Refractories
Song Qingzhong1,2; Qian Kun1,3; Shu Lei1,3; Chen Bo1,3; Ma Yingche1,3; Liu Kui1,3
Corresponding AuthorChen Bo(
AbstractHigh-performance nickel-based superalloys are highly desired in the aerospace industry. A drawback of vacuum induction melting for processing nickel-based superalloys is that oxide refractories contaminate the molten alloy through crucible-melt interaction. Therefore, crucibles used for producing nickel-based superalloys should be carefully selected to avoid melt contamination. In this study, the interfacial reaction between a molten nickel-based superalloy (K417G) and various oxide refractories, including Al2O3, CaO, MgO, ZrO2 + 12%Y2O3 (mass fraction) (Y-PSZ), ZrO2 + 20%CaO (CSZ), and Y2O3, formed by cold isostatic pressing was investigated at 1600 degrees C by XRD, SEM, and EDS. The effects of the oxide crucibles on the impurity contents of K417G were also evaluated. The results show that physical erosion is the primary mechanism of the interaction between Al2O3 crucibles and alloy melt. The readily detached Al2O3 particles formed inclusions in the alloy. The Ca3Al2O5 liquid phase generated at the melt-crucible interface promoted wettability between the alloy and CaO crucible, resulting in a high adhesion at the interface. The reaction of the MgO crucible with Al in the alloy resulted in the formation of MgAl2O4 at the melt-crucible interface, which subsequently entered the alloy to form inclusions. Al2O3 was generated at the Y-PSZ-crucible-alloy interface. However, there was no corrosion of Al2O3 in the Y-PSZ crucible, indicating the crucible exhibits excellent corrosion resistance to Al2O3 slags. The interaction between the CSZ crucible and alloy melt generated a CaAl2O4 liquid phase, making the crucible unstable to dissolve into the alloy. An Al2Y4O9 reaction layer is mainly formed at the Y2O3-crucible-alloy interface. The dissolution of Y2O3 into the alloy melt was high compared to that of other oxide refractories. The melt-crucible interaction also significantly affected the oxygen content of K417G. The oxygen concentration of the alloy fused by CaO, Y2O3, and Y-PSZ crucibles did not increase, whereas that of the alloy melted in CSZ, MgO, and Al2O3 crucibles increased from 0.0007% to 0.0011%, 0.0034%, and 0.0135%, respectively.
Keywordinterfacial reaction K417G refractory Al2O3 CaO MgO ZrO2 Y2O3
Indexed BySCI
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000816121700003
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChen Bo
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
3.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Song Qingzhong,Qian Kun,Shu Lei,et al. Interfacial Reaction Between Nickel-Based Superalloy K417G and Oxide Refractories[J]. ACTA METALLURGICA SINICA,2022,58(7):868-882.
APA Song Qingzhong,Qian Kun,Shu Lei,Chen Bo,Ma Yingche,&Liu Kui.(2022).Interfacial Reaction Between Nickel-Based Superalloy K417G and Oxide Refractories.ACTA METALLURGICA SINICA,58(7),868-882.
MLA Song Qingzhong,et al."Interfacial Reaction Between Nickel-Based Superalloy K417G and Oxide Refractories".ACTA METALLURGICA SINICA 58.7(2022):868-882.
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