High-Temperature Creep Behavior of Single Crystal Nickel-Base Superalloys with Different Orientations. Part II: Microstructure Evolution

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Abstract:

The high-temperature creep behavior of single crystal nickel-base superalloys with, [001], [011] and [111] orientations were studied under different experimental conditions. Details of the dynamic characteristics of these alloys were discussed in part I. This paper analyzes the microstructure evolution of the three different orientation superalloys during tensile creep. Results show that after heat treatment, the microstructure of the three different orientation superalloys consists of the cuboidal phase embedded coherently in the matrix channels, and aligned regularly along 100 orientation. During high-temperature tensile creep, the phase is transformed into rafted structure. After creep fracture, as the distance from the fracture decreases, the deformation extent of the specimen increases, and the thickness of the rafted phases and the twist extent also increases. The effect of the rafting orientation of the phase on the creep resistance of superalloys is also analyzed.

Keywords: CREEP; MICROSTRUCTURE EVOLUTION; NICKEL ALLOYS; RAFTING; SINGLE CRYSTAL SUPERALLOY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/asl.2012.2001

Publication date: March 1, 2012

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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