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Journal of Iron and Steel Research International
Published in: Journal of Iron and Steel Research International 8/2023

30-06-2023 | Original Paper

Effect of stabilizing treatment on microstructure and stress rupture properties of phosphorus microalloyed Inconel 706 alloy

Authors: Sha Zhang, Yu-chao Wu, Yu Li, Zhong-pei Dai, Dan Jia, Yan-fei Xu, Guang-sheng Zeng, Zhi-ming Guo, Jian Liu

Published in: Journal of Iron and Steel Research International | Issue 8/2023

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Abstract

The microstructure and stress rupture properties of Inconel 706 alloy microalloyed with phosphorus are examined under stabilizing and unstabilizing heat treatment conditions. It was found that applying the stabilizing treatment resulted in a 98% increment in the stress rupture life and a 215% increment in the elongation tested at 650 °C/690 MPa for the alloy compared to that under the unstabilizing heat treatment condition. The stabilizing treatment led to the precipitation of rod-shaped and needle-shaped η phases at the grain boundaries. Morphologies of γ′–γ″ co-precipitates in the grain interior were noncompact form and compact form for the alloy under unstabilizing and stabilizing heat treatment conditions, respectively. Based on the microstructure characterizations, the improvement of stress rupture properties by the stabilizing treatment was attributed to the precipitation of η phases at the grain boundaries, which can hinder cracks initiation and propagation and relieve the stress concentration.
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Metadata
Title
Effect of stabilizing treatment on microstructure and stress rupture properties of phosphorus microalloyed Inconel 706 alloy
Authors
Sha Zhang
Yu-chao Wu
Yu Li
Zhong-pei Dai
Dan Jia
Yan-fei Xu
Guang-sheng Zeng
Zhi-ming Guo
Jian Liu
Publication date
30-06-2023
Publisher
Springer Nature Singapore
Published in
Journal of Iron and Steel Research International / Issue 8/2023
Print ISSN: 1006-706X
Electronic ISSN: 2210-3988
DOI
https://doi.org/10.1007/s42243-023-01023-2

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