锻压技术

铸态P91耐热合金钢高温流变行为及本构方程

英文标题：High temperature rheological behavior and constitutive equation of as-cast heat-resisting alloy steel P91

作者：邓馗李永堂付建华刘强

单位：太原科技大学

分类号：TG142.73；TG376

出版年,卷(期):页码：2015,40(11):100-106

摘要：

为了研究铸态P91耐热合金钢的高温变形流变特性，建立铸态P91耐热合金钢高温流变应力本构方程，采用Gleeble-3500热模拟实验机对铸态P91耐热合金钢进行等温热压缩实验，研究了变形温度为900~1200 ℃、应变速率为0.01~5 s-1、变形量为60%条件下的热变形行为。研究结果表明，随着变形温度的升高和应变速率的降低，动态再结晶现象越容易发生，流变应力显著降低，曲线由加工硬化型向动态回复及动态再结晶型转变。在双曲正弦修正的Arrhenius型方程及Zener-Hollomon参数的基础上，考虑真应变对流动应力的影响，建立了铸态P91耐热合金钢的流变应力模型及本构方程。误差分析表明，所建立的本构方程具有良好的精度。

To study the high-temperature deformation rheological behavior of the as-cast heat-resisting alloy steel P91, its high-temperature rheological stress constitutive equation was established and its isothermal compression experiment was done by the Gleeble-3500 thermal simulation testing machine. Then, the heat deflection behavior was investigated under the condition of the deflection temperature 900-1200 ℃, the strain rate 0.01-5 s-1, and deformation 60%. Results show that with the increase of the deformation temperature and the decrease of the stress rate, the possibility of dynamic recrystallization increases and the flow stress decreases substantially. And the curves transform from work hardening to dynamic recovery and dynamic recrystallization. Based on the sine-hyperbolic Arrhenius equation and the Zener-Hollomon parameters, the impact of true strain on flow stress was considered. The flow stress model and constitutive equation of the as-cast state heat resistant alloy steel P91 were proposed. Error analysis demonstrates that the proposed constitutive equation has a good accuracy.

基金项目：

国家自然科学基金资助项目（51135007）

邓馗（1989-），男，硕士研究生

参考文献：

［1］郭元蓉, 吴红.P91无缝钢管国产化研究进展[J]. 钢管,2008,37(1):22-27.Guo Y R, Wu H. Progress of research on production localization of P91 seamless steel tube [J]. Steel Pipe, 2008, 37(1):22-27.
［2］李永堂,贾璐, 付建华.一种厚壁无缝钢管短流程铸挤连续成形的方法：中国, 201310025737.4 [P].2013-04-24. Li Y T, Jia L, Fu J H. A method for the progressive forming of short-process squeeze casting for the thick-walled seamless steel pipe，China, 201310025737.4[P].2013-04-24.
［3］李永堂, 秦芳诚, 齐会萍, 等.用铸挤复合成形生产大口径厚壁无缝钢管的方法：中国,201310025199.9[P].2013-04-24.Li Y T, Qin F C, Qi H P, et al. A method to produce large-diameter thick-walled seamless steel pipe by squeeze casting forming：China, 201310025199.9[P].2013-04-24.
［4］Martin C Mataya, Eric R Nilsson, Elliot L, et al. Hot working and recrystallization of as-cast 316L[J]. Metallurgical and Materials Transactions A, 2003, 34A(8):1683-1703.
［5］毛萍莉, 杨柯, 苏国跃.铸态奥氏体不锈钢的热变形行为[J]. 金属学报, 2001, 37(1):39-41.Mao P L, Yang K, Su G Y. Hot deformation behavior of as-cast austenitic stainless steel[J]. Acta Metallurgica Sinica, 2001,37(1):39-41.
［6］王雪凤,吴任东, 邓晨曦, 等.新型耐热高强钢P91的高温力学性能[J]. 机械工程学报,2008,44(6):243-247.Wang X F, Wu R D, Deng C X. Mechanical properties of new heat-resistant high-tensile steel P91 at high temperature [J]. Chinese Journal of Mechanical Engineering, 2008,44(6):243-247.
［7］ASTM E 112-13，Stand test methods for determining average grain size[S].
［8］辛选荣，赵文龙，谢田.TB8钛合金常温压缩应力应变曲线分析[J].锻压技术,2014,39(1):126-130. Xin X R, Zhao W L, Xie T. Analysis of TB8 titanium alloy compression stress-strain curve at room temperature[J].Forging ＆ Stamping Technology, 2014,39(1):126-130.
［9］郑漫庆，王高潮，徐雪峰，等.TC4-DT合金的超塑性变形及其本构方程[J].材料工程，2014,42(9):63-67.Zheng M Q, Wang G C, Xu X F, et al. Superplastic deformation and constitutive equations of TC4-DT alloy [J]. Journal of Materials Engineering, 2014,42(9):63-67.
［10］易幼平，杨积慧，蔺永诚.7050铝合金热压缩变形的流变应力本构方程[J].材料工程，2007,35(4):20-22.Zheng Y P, Yang J H,Lin Y C. Flow stress constitutive equations of 7050 aluminum alloy during hot compression[J]. Journal of Materials Engineering,2007,35(4):20-22.
［11］Lin Y C, Chen M S, Zhong J. Constitutive modeling for elevated temperature flow behavior of 42CrMo steel[J]. Computational Materials Science, 2008, 42:470-477.
［12］Li H Y,Wei D D, Hu J D, et al. Constitutive modeling for hot deformation behavior of T24 ferritin steel [J]. Computational Materials Science, 2012, 53(1):425-430.
［13］东赟鹏，王超渊，宋晓俊，等. GH5188合金流变行为研究[J]. 锻压技术，2013，38(6):116-121.Dong Y P, Wang C Y, Song X J, et al. Study on plastic deformation behavior of GH5188 super alloy[J]. Forging & Stamping Technology, 2013, 38(6):116-121.

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