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Title: Dissolution kinetics of {delta} phase and its influence on the notch sensitivity of Inconel 718

Abstract

The dissolution kinetics of {delta} phase in Inconel 718 at 980 deg. C, 1000 deg. C and 1020 deg. C and its influence on high temperature notch sensitivity have been studied using a quantitative X-ray diffraction (XRD) method and high temperature stress rupture life tests of notched specimens. The amount of {delta} phase decreases gradually during holding time at 980 deg. C, 1000 deg. C and 1020 deg. C. The {delta} phase will be fully dissolved in the austenitic matrix at 1020 deg. C for more than 2 h. A certain amount of {delta} phase still exists after holding at 980 deg. C and 1000 deg. C for times up to 6 h; the amount remaining are 3 wt.% and 0.6 wt.%, respectively. The dissolution rate remains at a high level at the beginning, and then decreases gradually with an increase of holding time. A dynamic equilibrium state can be approached after holding at 980 deg. C for more than 30 min and at 1000 deg. C for more than 2 h. The alloy with {delta} phase amounts higher than 0.62 wt.% does not exhibit notch sensitivity, whereas serious notch sensitivity exists if the concentration is below 0.43 wt.%.

Authors:
 [1];  [2];  [2];  [2];  [2]
  1. State key Laboratory of Metastable Materials Science and Technology, Yanshan University, 066004, Qinhuangdao (China). E-mail: dayongcai@sina.com.cn
  2. State key Laboratory of Metastable Materials Science and Technology, Yanshan University, 066004, Qinhuangdao (China)
Publication Date:
OSTI Identifier:
21003534
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 58; Journal Issue: 3; Other Information: DOI: 10.1016/j.matchar.2006.04.020; PII: S1044-5803(06)00121-5; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITIC STEELS; DISSOLUTION; INCONEL 718; NOTCHES; RUPTURES; SENSITIVITY; THERMAL STRESSES; X-RAY DIFFRACTION

Citation Formats

Cai Dayong, Zhang Weihong, Nie Pulin, Liu Wenchang, and Yao Mei. Dissolution kinetics of {delta} phase and its influence on the notch sensitivity of Inconel 718. United States: N. p., 2007. Web.
Cai Dayong, Zhang Weihong, Nie Pulin, Liu Wenchang, & Yao Mei. Dissolution kinetics of {delta} phase and its influence on the notch sensitivity of Inconel 718. United States.
Cai Dayong, Zhang Weihong, Nie Pulin, Liu Wenchang, and Yao Mei. Thu . "Dissolution kinetics of {delta} phase and its influence on the notch sensitivity of Inconel 718". United States. doi:.
@article{osti_21003534,
title = {Dissolution kinetics of {delta} phase and its influence on the notch sensitivity of Inconel 718},
author = {Cai Dayong and Zhang Weihong and Nie Pulin and Liu Wenchang and Yao Mei},
abstractNote = {The dissolution kinetics of {delta} phase in Inconel 718 at 980 deg. C, 1000 deg. C and 1020 deg. C and its influence on high temperature notch sensitivity have been studied using a quantitative X-ray diffraction (XRD) method and high temperature stress rupture life tests of notched specimens. The amount of {delta} phase decreases gradually during holding time at 980 deg. C, 1000 deg. C and 1020 deg. C. The {delta} phase will be fully dissolved in the austenitic matrix at 1020 deg. C for more than 2 h. A certain amount of {delta} phase still exists after holding at 980 deg. C and 1000 deg. C for times up to 6 h; the amount remaining are 3 wt.% and 0.6 wt.%, respectively. The dissolution rate remains at a high level at the beginning, and then decreases gradually with an increase of holding time. A dynamic equilibrium state can be approached after holding at 980 deg. C for more than 30 min and at 1000 deg. C for more than 2 h. The alloy with {delta} phase amounts higher than 0.62 wt.% does not exhibit notch sensitivity, whereas serious notch sensitivity exists if the concentration is below 0.43 wt.%.},
doi = {},
journal = {Materials Characterization},
number = 3,
volume = 58,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}