工业纯钛TA1退火过程中的应力诱导晶粒长大行为  

Abnormal Grain Growth Induced by Stress During Annealing of Industrial Pure Titanium TA1

作　　者：刘继伟 李学问 房文斌 Liu Jiwei;Li Xuewen;Fang Wenbin(Key Laboratory for Light-Weight Materials,Nanjing Tech University,Nanjing 210009,China;School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]南京工业大学先进轻质高性能材料研究中心,江苏南京210009 [2]哈尔滨理工大学材料科学与化工学院,黑龙江哈尔滨150080

出　　处：《稀有金属材料与工程》2024年第3期625-631,共7页Rare Metal Materials and Engineering

摘　　要：探究了应力对纯钛再结晶行为的影响。在纯钛板的退火过程中施加弯曲应力,并观察一个截面在拉伸和压缩应力下的再结晶过程。制备了变形量分别为20%、40%和60%的工业纯钛TA1轧制板,然后将这些样品置于600℃和30 MPa下保温10 min。结果表明,在变形20%和40%的样品中,只观察到少数再结晶晶粒。此外,受应力区域的平均晶粒尺寸大于无应力区域。进一步将变形40%的轧制薄板在600℃和30 MPa下保温60和120 min,拉伸应力区域中晶粒的异常生长一直持续到达到临界尺寸,之后晶粒停止生长。再结晶过程中晶粒生长的持续增加可归因于应力促进的位错调节。具有有利条件的晶粒倾向于沿着所施加的应力方向异常生长。然而,钛板内的高密度残余位错导致晶粒生长的驱动力降低,导致临界尺寸的存在。这些发现解释了钛在拉伸和压缩应力下观察到的不同再结晶行为。The influence of stress on the recrystallization process of pure titanium was investigated.Bending stress was applied during the annealing process of a pure titanium plate to observe the recrystallization process under tensile and compressive stresses on one section.Industrial pure titanium TA1 rolled plates with different deformation levels of 20%,40%,and 60%were prepared.These samples were then subjected to a temperature of 600℃ and a stress of 30 MPa for 10 min.It is found that in the samples with 20%and 40%deformation levels,only a few recrystallized grains are observed.Additionally,the average grain size in the region under stress becomes larger than that in the region without stress.To further investigate the grain growth,the rolled sheet with 40%deformation level was kept at 600℃ and 30 MPa for 60 and 120 min.It is observed that the abnormal growth of grains in the tensile stress area continues until the critical size is reached,after which they stop growing.The increased grain growth during recrystallization can be attributed to the stress-promoting dislocation adjustment.The grains with favorable conditions tend to grow abnormally along the direction of the applied stress.However,the high density of residual dislocations within the titanium plate results in a reduction in the driving force for grain growth,leading to the existence of critical size.These findings provide an explanation for different recrystallization behavior observed in titanium under tensile and compressive stresses.

关 键 词：TA1 再结晶 异常长大 应力 

分 类 号：TG166.5[金属学及工艺—热处理]