NDLI: Bifilm Defects in Ni-Based Alloy Castings

Content Provider	Springer Nature Link
Author	Campbell, John Tiryakioğlu, Murat
Copyright Year	2012
Abstract	The Ni-base superalloys, which are normally melted and cast in a vacuum, entrain their surface-oxide film during turbulent pouring of the melt; unfortunately at this time, this process is universally practiced for investment castings of these materials. The entrained film becomes a bifilm crack automatically, so that cast alloys have a large population of cracks that controls their failure behavior. The problems of the growth of single crystals and the welding of polycrystalline alloys are reviewed to illustrate the central role of bifilms in the cracking of turbine blades, the heat-affected zones of welds, and the reliability of properties. It has been demonstrated that improved gravity pouring systems can reduce these problems significantly, but only countergravity filling of molds is expected to result in defect-free castings. Recent cases in which turbine blades failed in service are examined, and the central role of bifilm defects in these failures is discussed.
Starting Page	902
Ending Page	914
Page Count	13
File Format	PDF
ISSN	10735615
Journal	Metallurgical and Materials Transactions B
Volume Number	43
Issue Number	4
e-ISSN	15431916
Language	English
Publisher	Springer US
Publisher Date	2012-04-10
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanotechnology Characterization and Evaluation of Materials Metallic Materials Structural Materials Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Mechanics of Materials Condensed Matter Physics

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