不同道次应变分配下TA15钛合金双道次热压缩静态软化行为  

Static softening behavior of TA15 Ti-alloy in double-pass hot compression with different pass strain distributions

作　　者：赵丽娟 魏科[1,2] 黄骏 董显娟 黄龙[1] 涂泽立 ZHAO Li-juan;WEI Ke;HUANG Jun;DONG Xian-juan;HUANG Long;TU Ze-li(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;Department of Materials Science and Engineering&RIAM,Seoul National University,Seoul 151-742,Republic of Korea)

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063 [2]首尔国立大学材料科学与工程系&RIAM,韩国首尔151-742

出　　处：《材料热处理学报》2024年第7期194-200,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52005241);江西省自然科学基金(20232BAB204050);国家留学基金委(202208360107);南昌航空大学研究生创新专项资金项目(YC2022-023)。

摘　　要：在变形温度为910~970℃、应变速率为0.01 s^(-1)、道次保温时间为1000 s、总应变为0.9条件下,对TA15钛合金进行了双道次热压缩实验,研究了第一道次应变为0.25、0.45、0.65时对合金热变形过程中静态软化行为的影响。结果表明:在不同第一道次应变分配下,除变形温度为910℃且应变为0.25时,合金在道次保温间隔后均出现了静态软化现象,即第二道次流动应力峰值均低于第一道次卸载应力;第一道次应变分配较高时,由于累积畸变能较多,软化程度更为明显;变形温度越接近相变点,第一道次应变对静态软化影响程度越大;微观组织分析表明,道次保温间隔后比保温前的初生α相体积分数明显减少,减小程度与静态软化程度呈正相关性。A double-pass hot compression experiment was conducted on TA15 titanium alloy under the conditions of deformation temperature of 910-970 ℃,strain rate of 0.01 s^(-1),inter-pass holding time of 1000 s and total strain of 0.9.The effect of the first-pass strain of 0.25,0.45 and 0.65 on the static softening behavior of the alloy during hot deformation was studied.The results show that under different strain distributions in the first-pass,except for the deformation temperature of 910 ℃ and strain of 0.25,the alloy exhibits static softening phenomenon after the inter-pass holding,that is,the peak flow stress of the second-pass is lower than that of the first-pass.When the first-pass strain distribution is high,the degree of softening is more obvious due to the accumulation of more distortion energy.The closer the deformation temperature is to the phase transition point,the greater the influence of the first-pass strain on static softening is.The microstructure analysis shows that the volume fraction of primary α phase significantly decreases after the inter-pass holding compared to before,and the degree of reduction is positively correlated with the degree of static softening.

关 键 词：TA15钛合金 双道次热变形 第一道次应变分配 静态软化行为 组织演变 

分 类 号：TG146.2[一般工业技术—材料科学与工程]