Microstructural development involving nucleation and growth phenomena simulated with the Phase Field method

被引:98
|
作者
Simmons, JP
Wen, YH
Shen, C
Wang, YZ
机构
[1] USAF, Res Labs, Wright Patterson AFB, OH 45433 USA
[2] UES Inc, Dayton, OH USA
[3] Ohio State Univ, Columbus, OH 43210 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 365卷 / 1-2期
基金
美国国家科学基金会;
关键词
phase field; simulation; superalloy; non-isothermal transformation; nucleation; bimodal particle size distribution;
D O I
10.1016/j.msea.2003.09.019
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A Phase Field model is developed for non-isothermal heat treatment conditions. Nucleation and growth occur on different time scales, to sample frequently enough to observe nucleation would require an impractically large number of integration cycles to be performed in order to observe growth kinetics in real alloys. For this reason, the Langevin noise terms in the Phase Field equations were replaced with a Poisson seeding algorithm, in which viable nuclei were introduced in the microstructure at a rate matched by the observed nucleation rate. The interparticle spacing for isothermal simulations was observed to be rootDt, in agreement with hypothesis that nucleation stalls in isothermal simulations because of soft impingement. Kinetics were observed to give the correct Avrami exponent in the constant nucleation rate extreme, but deviated from the Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory with nucleation rates that varied with time. This was explained as being due to soft impingement, where JMAK theory is known to break down. Results of continuous cooling simulations showed a window of quench rates that would form bimodal particle size distributions, in agreement with recent experimental studies in superalloys. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:136 / 143
页数:8
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