Chemical analysis, structure and mechanical properties of discrete and compositionally graded SS316–IN625 dual materials

Discrete and compositionally graded dual materials based on SS316 and IN625 alloys were made using LENS™ process by layer wise deposition, controlling feed rates of individual alloy powders. The two-alloy interface regions were characterized with respect to microstructure, elemental distribution, mi...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-10, Vol.647, p.344-352
Main Authors: Savitha, U., Jagan Reddy, G., Venkataramana, A., Sambasiva Rao, A., Gokhale, A.A., Sundararaman, M.
Format: Article
Language:English
Subjects:
Alloy powders
Alloys
Austenitic stainless steels
Bonding
Chemical analysis
Compositionally graded materials (CGM)
Deposition
Feed rate
Layered deposition
Microstructure
Nickel base alloys
Solidification
Stainless steel
Superalloy and Laser Engineered Net Shaping (LENS)
Superalloys
Yield strength
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Summary:Discrete and compositionally graded dual materials based on SS316 and IN625 alloys were made using LENS™ process by layer wise deposition, controlling feed rates of individual alloy powders. The two-alloy interface regions were characterized with respect to microstructure, elemental distribution, micro-hardness, and tensile properties of the deposits. For discrete as well as graded deposits, change in composition near the interface is gradual. This observation is explained on the basis of dilution by the substrate. Irrespective of whether the variation in powder feed rate is changed gradually or discretely, the yield strength of the materials is always comparable to that of the lower strength material of the two, viz., SS316 and failure occurred within SS316 indicating good bonding in the two alloy interface region.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2015.09.001