Constitutive analysis to predict high-temperature flow stress in modified 9Cr-1Mo (P91) steel
Constitutive analysis to predict high-temperature flow stress in modified 9Cr-1Mo (P91) steel
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DOI：
10.1016/j.matdes.2009.08.012
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发表时间：
2010-02-01
影响因子：
8.4
通讯作者：
Bhaduri, A. K.
中科院分区：
文献类型：
--
作者：
Samantaray, Dipti;Mandal, Sumantra;Bhaduri, A. K.
采用等温热压缩试验的应力-应变数据，在较宽的温度（1123-1373 K）、应变（0.1-0.5）和应变速率（10（-3）~ 10（2）s（-1））范围内，对改性9 Cr-1 Mo（P91）铁素体钢的热加工进行了本构分析。温度和应变速率对变形行为的影响用Zener-Hollomon参数的指数型方程表示。通过考虑应变对不同材料常数的影响，将应变的影响纳入本构方程。发现活化能随应变在369-391 kJ mol（-1）范围内变化。所建立的变形本构方程（考虑了应变补偿）能够预测改性9 Cr-1 Mo钢在特定热加工区域内的流变应力，具有很好的相关性和泛化能力。(C)2009爱思唯尔有限公司保留所有权利。
Constitutive analysis for hot working of modified 9Cr-1Mo (P91) ferritic steel was carried out employing experimental stress-strain data from isothermal hot compression tests, in a wide range of temperatures (1123-1373 K), strains (0.1-0.5) and strain rates (10(-3)-10(2) s(-1)). The effects of temperature and strain rate on deformation behaviour were represented by Zener-Hollomon parameter in an exponent-type equation. The influence of strain was incorporated in the constitutive equation by considering the effect of strain on different material constants. Activation energy was found to vary with strain in the range 369-391 kJ mol(-1). The developed constitutive equation (considering the compensation of strain) could predict flow stress of modified 9Cr-1Mo steel over the specified hot working domain with very good correlation and generalization. (C) 2009 Elsevier Ltd. All rights reserved.