The Influence of VIM Crucible Composition, Vacuum ARC Remelting, and Electroslag Remelting on the Non-Metallic Inclusion Content of MERL 76

Brown, E. Ernest S.; Stulga, John E.; Jennings, L.J.; Salkeld, R.W.

doi:10.7449/1980/superalloys_1980_159_168

Cited by 10 publications

(3 citation statements)

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“…The contents of oxygen, sulphide and nitrogen impurity After the fresh Ni-base superalloy ingots are remelted, the oxygen, sulphide and nitrogen impurities inevitably increase due to the reaction between the alloy and the material of crucible or formwork [3][4][5][6][7][8][9]. With the addition of recycled scraps, the content of oxygen and nitrogen in revert alloy obviously augment, whereas the amount of sulphide and silicic impurities have insignificant relationship with the proportion of the recycled, as illustrated in Tab.1.…”

Section: Effect Of Recycled Materials Proportionmentioning

confidence: 99%

“…The dross (oxide) inclusions were found to be the single most frequent cause for casting rejections [6]. Studies on P/M nickel-base superalloy materials have shown that the minimum low cycle fatigue life (LCF) is set by the presence of small, nonmetallic oxide inclusions in the material [7][8]. The need for cleanliness and tighter control over the content and size of nonmetallic particulates (inclusions) in superalloys is a real and severe one.…”

Section: Introductionmentioning

confidence: 99%

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Recycled Applications of a Single Crystal Superalloy

Sun

Lou

et al. 2011

AMR

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The effects of application of recycled scraps on the composition, microstructure and mechanical properties of SRR99 alloy were studied. The compositions of recycle master alloy are similar to that of the fresh alloy. However, nitrogen content, the size and amount of microporosity increase significantly with the recycle material proportion. Granular, lamellar and strip-like MC particles mainly represent in the interdendritic regions of the revert alloy. With the addition of the recycled material proportion, the amount of the granular ones rapidly drop and the lamellar ones gently enhance. The stress rupture life decline with the addition of the recycled material proportion. The oxide and sulphide inclusions in revert superalloy can be effectively captured and removed by a foam ceramic filter so that the tensile and stress rupture property has been significantly improved.

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Section: Effect Of Recycled Materials Proportionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recycled Applications of a Single Crystal Superalloy

Sun

Lou

et al. 2011

AMR

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“…This is especially important during the production of expensive high alloyed metals such as the Ni‐based superalloy Alloy 825. Several investigations have been focused on investigations of non‐metallic inclusions during the different steps of the production of various superalloys . Some common non‐metallic inclusions that were found during these studies include Al 2 O 3 , MgO–Al 2 O 3 , and TiN .…”

Section: Introductionmentioning

confidence: 99%

Estimation of Non-Metallic Inclusions in Industrial Ni Based Alloys 825

Kellner

Karasev

Sundqvist

et al. 2017

steel research int.

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It is well known that inclusions affect the properties of the steel and other alloys. The importance of understanding the behavior of the inclusions during production can never be overstated. This study has examined the main types of big size (>10 μm) inclusions that exist in Ni‐based Alloy at the end of ladle treatment and after casting during industrial production of Ni based Alloys 825. Sources, mechanisms of formation and behavior of different type large size inclusions in Alloy 825 are discussed based on 2 and 3D investigations of inclusion characteristics (such as, morphology, composition, size, and number) and thermodynamic considerations. The large size inclusions found can be divided in spherical (Type I and II) inclusions and in clusters (Type III–V). Type I‐A inclusions (Al2O3–CaO–MgO) originate from the slag. Type I‐B inclusions and Type II inclusions consist of CaO–Al2O3–MgO and Al2O3–TiO2–CaO, respectively. Both types originate from the FeTi70R alloy. Type III clusters (Al2O3–MgO–CaO) are formed during an Al deoxidation of the Ni‐based alloy. Type IV clusters (Al2O3–TiO2–CaO) formed from small inclusions, which are precipitated in local zones which contain high Ti and Al levels. These clusters are transformed to Type III clusters over time in the ladle. Finally, Type V clusters are typical TiN clusters.

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