摘要
采用Gleeble-1500热力模拟机对铸态Ti-48Al-2Nb-2Cr合金进行高温变形热压缩试验,变形温度范围为1050~1200℃,应变速率范围为0.001~0.1s^-1,压缩变形量为60%。研究该合金高温变形温度和应变速率与流变应力之间的关系,计算了合金激活能,并建立了Ti-48Al-2Nb-2Cr合金的Arrhenius本构模型和多元线性回归的本构模型。结果表明,该合金的激活能随温度升高和应变速率增大而增大;Arrhenius本构模型的相关系数为0.98228,平均相对误差为9.97%,相对误差在10%以内的点只占62.0%;而采用多元线性回归本构模型的相关系数为0.99566,平均相对误差为4.76%,相对误差在10%以内的点占92.6%,本构精度较高。
The as-cast Ti-48Al-2Nb-2Cr alloy was subjected to high temperature hot compressive deformation test by using Gleeble-1500 thermal simulator at 1050℃to 1200℃and the strain rate of 0.001 s^-1 to 0.1 s^-1 as well as deformation rate of 60%.The relationship between deformation temperature,strain rate and flow stress during high temperature deformation of the alloy was analyzed.Meanwhile,the active energy of the alloy was calculated.The Arrhenius constitutive model of Ti-48Al-2Nb-2Cr alloy and the constitutive model of multiple linear regression were established.The results reveal that the active energy of the alloy is increased with increasing in temperature and strain rate.The correlation coefficient Rof the Arrhenius constitutive model reaches 0.98228,and the average relative error is 9.97%.In addition,the relative error within 10%only accounts for 62.0%.The correlation coefficient Rof the constitutive model of Ti-48Al-2Nb-2Cr alloy with multivariate linear regression reaches0.99566,and the average relative error is 4.76%,meanwhile,the relative error within 10%is 92.6%,presenting a higher constitutive accuracy.
作者
倪红明
董显娟
徐勇
鲁世强
龚思恒
Ni Hongming;Dong Xianjuan;Xu Yong;Lu Shiqiang;Gong Siheng(National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University)
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第2期228-232,共5页
Special Casting & Nonferrous Alloys
基金
江西省教育厅科学技术基金资助项目(GJJ180535)
轻合金加工科学与技术国防重点学科实验室基金资助项目(GG201903068)。
作者简介
第一作者:倪红明,男,1994年出生,硕士研究生,电话:18279131101,E-mail:NHMYSQW@163.com通信作者:董显娟,女,1979年出生,副教授,电话:13397080873,E-mail:dxj3@163.com。
