On the Rate Dependence of Precipitate Formation and Dissolution in a Nickel-Base Superalloy

Author:

D’Souza Neil,Hardy Mark C.,Roebuck Bryan,Li Wei,West Geoff D.,Collins David M.

Abstract

AbstractThe temporal dependence of $$\gamma '$$ γ dissolution in the polycrystalline Ni-base superalloy RR1000 has been studied with implications to thermo-mechanical processing. A resistivity-based method using an electro-thermal mechanical testing (ETMT), which overcomes the drawbacks associated with other approaches, such as calorimetry, dilatometry, and diffraction, has been used to explore the effect of transient and isothermal thermal cycles. This is supplemented by DICTRA numerical models that simulate the diffusion within the $$\gamma $$ γ phase up to the $$\gamma /\gamma '$$ γ / γ interface. It is demonstrated that dissolution is affected by heating rate as well as the precipitate size. Below a threshold heating rate of $$\sim $$ 0.1 $${^\circ }$$ C s$$^{-1}$$ - 1 , the dissolution kinetics are marginally affected, however, is sensitive to microstructure. The role of precipitate size during dissolution is governed by diffusion flux in the $$\gamma $$ γ phase at the $$\gamma /\gamma '$$ γ / γ interface, which is inversely proportional to size. It is argued that numerical simulations that predict constitutional liquation during rapid heating by altering the width of the computation domain to match the average precipitate size of the $$\gamma '$$ γ population will yield inaccurate predictions. The influence of the heating rate on the nucleation undercooling, during subsequent cooling, has also been addressed. With increasing heating rates, the local $$\gamma '$$ γ solvus temperature is shifted to progressively higher temperatures. Unless complete dissolution of $$\gamma '$$ γ occurs prior to subsequent cooling, erroneous interpretations of nucleation undercooling can arise.

Publisher

Springer Science and Business Media LLC

Subject

Metals and Alloys,Mechanics of Materials,Condensed Matter Physics

Reference51 articles.

1. M. Durrand-Charre: The Microstructure of Superalloys (CRC Press, Amsterdam, 1997).

2. N. Warnken, H. Larsson, and R. Reed: Mater. Sci. Tech., 2009, vol. 25, pp. 179–85.

3. R. Mitchell, J. Lemsky, R. Ramanathan, H. Li, K. Perkins, and L. Connor, in Superalloys 2008. ed. by R. Reed, K. Green, P. Caron, T. Gabb, M. Fahrmann, E. Huron, S. Woodard (The Minerals, Metals and Materials Society, Warrendale, PA, 2008), pp. 347–56.

4. R. Radis, M. Schaffer, M. Albu, G. Kothleitner, P. Polt, and E. Kozechnik: Acta Mater., 2009, vol. 57, pp. 5739–47.

5. D.B.T.P. Gabb, D. Wei, D. Mourer, D. Furrer, A. Garg, D. Ellis, in Superalloys 2000. ed. by T. Pollock, R. Kissinger, R. Bowman, K. Green, M. McLean, S. Olson, J. Schirra (The Minerals, Metals and Materials Society, Warrendale, PA, 2000), pp. 405–14

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3