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A metallographic study of aging in a cast heat-resisting alloy

Authors
Journal
Materials Characterization
1044-5803
Publisher
Elsevier
Publication Date
Volume
45
Issue
1
Identifiers
DOI: 10.1016/s1044-5803(00)00047-4
Keywords
  • Heat-Resistant Cast Alloys
  • Aging
  • Microstructure

Abstract

Abstract Microstructural evolution of a heat-resisting cast alloy was studied by light and electron optical methods. Samples from a cast pipe, used in a reformer furnace, were cut and aged for up to 6 weeks at 750°C. The material was prepared for metallographic examination in the standard way, and electrolytically etched with an oxalic acid solution. The samples were examined with a light optical and a scanning electron microscope. Examination with the electron microscope was carried out with secondary and backscattered electron detectors; X-ray analysis was conducted at selected areas of the samples. It was found that the microstructure in the as-cast samples consisted of an austenitic matrix and a network of two types of primary carbides (chromium and niobium), whereas that of the aged materials also exhibit a fine dispersion of small chromium carbide precipitates; decomposition of primary niobium carbides was found to occur as aging progressed.

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