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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 5/2012

01.05.2012

Microstructure Evolution during Supersolvus Heat Treatment of a Powder Metallurgy Nickel-Base Superalloy

verfasst von: S. L. Semiatin, K. E. McClary, A. D. Rollett, C. G. Roberts, E. J. Payton, F. Zhang, T. P. Gabb

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 5/2012

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Abstract

Microstructure evolution during the supersolvus heat treatment of a powder-metallurgy, low-solvus, high-refractory (LSHR) superalloy was established. For this purpose, three lots of LSHR with varying initial carbon/boron composition and thermomechanical history were subjected to a series of short-time (induction) and long-time (furnace) heat treatments followed by scanning electron microscopy/electron backscatter diffraction and quantitative metallography. The size of the (pinned) gamma grains exhibited a limited dependence on heating rate and soak time at peak temperature, and it was generally smaller than the predictions based on the classic Smith-Zener model. The differences were rationalized in terms of stereological and pinning-particle location effects. Observations of limited coarsening of the carbide/boride pinning particles were interpreted in the context of prior experimental observations and a modified Lifshitz-Slyosov-Wagner model applied previously for the coarsening of compound phases in steels.
Vorheriger Artikel Cooling Rate Dependence of Boron Distribution in Low Carbon Steel
Nächster Artikel Electrochemical Removal of AlCl3 from LiCl-KCl Melts

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Fußnoten
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The shape factor σ for a lognormal distribution is related to the ratio of the standard deviation sx and the mean \( < s > \) of the distribution by the relation \( {\text{s}_{x}}/ < s > = \sqrt {\mathop e\nolimits^{{\sigma^{2} }} - 1} \).
 
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Metadaten
Titel
Microstructure Evolution during Supersolvus Heat Treatment of a Powder Metallurgy Nickel-Base Superalloy
verfasst von
S. L. Semiatin
K. E. McClary
A. D. Rollett
C. G. Roberts
E. J. Payton
F. Zhang
T. P. Gabb
Publikationsdatum
01.05.2012
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 5/2012
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-011-1035-y

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