800H合金动态再结晶行为研究
收稿日期: 2012-04-27
修回日期: 2012-06-14
网络出版日期: 2012-10-11
基金资助
国家重点基础研究发展计划资助项目2011CB606306-2
RESEARCH ON DYNAMIC RECRYSTALLIZATION BEHAVIOR OF INCOLOY 800H
Received date: 2012-04-27
Revised date: 2012-06-14
Online published: 2012-10-11
Supported by
Supported by National Basic Research Program of China (No.2011CB606306–2)
在MMS-300热模拟机上对800H合金进行了单道次压缩实验, 结合EBSD和TEM等技术, 研究了该合金在850-1100 ℃和0.01-10 s-1变形条件下的动态再结晶行为. 结果表明, 当变形温度低于950 ℃时, 析出了大量Cr23C6和Ti(C,N)析出相, 其对动态再结晶行为产生明显的抑制作用. 建立了2段温度区间内(850-950 ℃和950-1100 ℃)800H合金的热变形本构方程; 采用lnθ-ε曲线的三次多项式拟合求解拐点的方法, 较准确地预测了800H合金动态再结晶临界应力/峰值应力和临界应变/峰值应变的比值, 并建立了临界应力、临界应变与$Z$参数的关系;800H合金在热变形过程中动态再结晶形核机制主要包括应变诱导晶界迁移、晶粒碎化以及亚晶合并形核机制.
曹宇 邸洪双 张洁岑 张敬奇 马天军 . 800H合金动态再结晶行为研究[J]. 金属学报, 2012 , 48(10) : 1175 -1185 . DOI: 10.3724/SP.J.1037.2012.00236
In order to optimize the hot working technology of Incoloy 800H, the dynamic recrystallization (DRX) behavior of Incoloy 800H at temperatures ranging from 850 ℃ to 1100 ℃ and strain rates from 0.01 s-1 to 10 s-1 was investigated by single–pass compression tests on MMS–300 thermo–mechanical simulator. The evolutions of microstructure and nucleation mechanisms of DRX were analyzed combined with the technique of EBSD and TEM. The results show that when the deformation temperature is below 950 ℃, the behavior of DRX is obviously restrained by precipitation of Cr23C6 and Ti(C,N). Therefore the hot deformation constitutive equations in two temperature intervals (from 850 ℃ to 950 ℃and from 950 ℃ to 1100 ℃) were established by regression analysis with the deformation activation energy of 465.394 kJ/mol and 427.360 kJ/mol respectively. The inflection points were determined by fitting a third order polynomial to the lnθ–ε curves, which makes the prediction for the ratios of critical stress to peak stress and critical strain to peak strain more accurately. Accordingly, the mathematical models of critical stress and critical strain vs Z parameter were deduced. The DRX nucleation mechanisms of Incoloy 800H during hot deformation mainly include strain induced grain boundary migration, grain fragmentation and subgrain coalescence.
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