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Evaluating Alloy Composition Using The Gibbs Triangle

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Abstract

Ingot quality is characterized by SPC evaluations; meaning Structure (S), Property (P), and Composition (C). Structure-property studies are classified as “sensitive” attributes while composition is considered to be an “insensitive” parameter. For example, it is common to hear the phrase that global composition is “insensitive” to structure and property values. For superalloys, structural analyses are applied using the scanning electron microscope (SEM) to determine both size, shape and distribution effects for the gamma prime phase. Examination of properties requires mechanical tests for strength, hardness, toughness and, so forth. However, for investigations on composition, the scientific community still depends on optical emission spectroscopy (OES) for measurements of global results using arc burns to represent bulk volume. This leads to the obvious question…. What needs to be done to better quantify the OES results? Further…. How can the controlling microconstituents of a superalloy be better related to the overall composition results for an improved qualification of ingots? This article addresses these needs and priorities. And, the said article is offered as a contribution to the sum of total knowledge.

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Authors and Affiliations

  1. Hays Metallurgical, PO Box 3250, Pearland, TX, 77588, USA

    Charles Hays

  2. A&M Technical Services, PO Box 30510, Houston, TX, 77249, USA

    Anthony Rudnicki

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  1. Charles Hays
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  2. Anthony Rudnicki
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Correspondence to Charles Hays.

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Hays, C., Rudnicki, A. Evaluating Alloy Composition Using The Gibbs Triangle. J. of Materi Eng and Perform 17, 566–571 (2008). https://doi.org/10.1007/s11665-007-9171-7

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  • DOI: https://doi.org/10.1007/s11665-007-9171-7

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