新型含铝Fe-Cr合金的热变形行为及热加工图  

Hot Deformation Behavior and Processing Map of Novel Fe-Cr Alloy Containing Aluminum

作　　者：孙胜英 孙锦超 杨鑫 梁顺星 张喜亮 刘宏基 Sun Shengying;Sun Jinchao;Yang Xin;Liang Shunxing;Zhang Xiliang;Liu Hongji(School of Materials Science and Engineering,Hebei University of Engineering,Handan 056038;Hebei Key Laboratory of Wear-Resistant Metallic Materials with High Strength and Toughness,Handan 056038;Department of Computer Engineering,Taiyuan Institute of Technology,Taiyuan 030013)

机构地区：[1]河北工程大学材料科学与工程学院,邯郸056038 [2]河北省高强韧耐磨金属材料重点实验室,邯郸056038 [3]太原工业学院计算机工程系,太原030013

出　　处：《特种铸造及有色合金》2024年第3期359-363,共5页Special Casting & Nonferrous Alloys

基　　金：2023年邯郸市科技局市级科技研发计划资助项目。

摘　　要：采用Gleeble-3500热模拟试验机对Fe-18Ni-12Cr-3Al合金进行压缩试验,其变形温度为925~1175℃、应变速率为0.01~10 s^(-1)。分析了合金真应力-真应变曲线,建立了本构方程及热加工图,并结合θ-σ曲线上的拐点,采用拐点法研究其动态再结晶的临界条件。结果表明,Fe-18Ni-12Cr-3Al合金应力随着应变速率增加和变形温度降低而升高,发生动态再结晶的临界应力和峰值应力之间具有相关性,即σ_(c)=0.95σ_(p)。依据热本构方程和热加工图,热激活能为376.1 kJ/mol,应变为0.1时的最佳热加工区域是变形温度为1110~1160℃,应变速率为0.01~1 s^(-1)。The compression test was conducted on Fe-18Ni-12Cr-3Al alloy by Gleeble-3500 thermal simulator in temperature range of 925~1175℃and strain of 0.01~10 s^(-1).The true stress-strain curve was analyzed,and the constitutive equation as well as thermal processing map was established.The critical conditions of dynamic recrystallization were investigated by inflection point method based onθ-σcurve.The results indicate that the flow stress of Fe-18Ni-12Cr-3Al alloy is increased significantly with increasing in strain rate and decreasing in deformation temperature.There exits a correlation between the critical stress and peak stress for dynamic recrystallization of the alloy,which isσ_(c)=0.95σ_(p).According to the constitutive equation and thermal processing map,the activation energy is 376.1 kJ/mol,and the optimal processing domain are determined in temperature range of 1110~1160℃and strain of 0.01~1 s^(-1).

关 键 词：Fe-18Ni-12Cr-3Al合金 热变形行为 本构方程 热加工图 

分 类 号：TG146.22[一般工业技术—材料科学与工程]