TC25G钛合金热变形过程中的组织演变
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摘要
利用Gleeble 3800型热模拟试验机对TC25G钛合金进行了恒应变速率热压缩变形实验,获得了变形温度为930~1 020℃、应变速率为0.001~50 s~(-1)、变形程度为60%条件下的组织演变特征。结果表明:应变速率对α相的含量和形状基本没有影响,而对β转变组织的影响较大,高应变速率下呈带状,低应变速率下呈等轴状;变形温度对于控制α相含量有显著影响,α相含量随变形温度升高而降低,960℃时,仅为8%,且较高的变形温度下,β晶粒尺寸也相对粗大。
By the means of Gleeble 3800 thermal simulator,through the testing of constant strain rate of hot compression deformation,this research got the microstructure evolution of TC25 G titanium alloy under the conditions of a deformation temperature of 930 ~ 1 020 ℃,strain rate of 0. 001 ~ 50 s-1 and the deformation of 60%. The results show that,the strain rate has little effect on the α phase content and shape,but has a great influence on the β-transformation structure. It is banded at high strain rate and equiaxed at low strain rate. The deformation temperature has a significant effect on the control of α phase content. The α phase content decreases with the increasing of deformation temperature,only 8% at 960 ℃,and the β grain size is relatively coarse at higher deformation temperature.
By the means of Gleeble 3800 thermal simulator,through the testing of constant strain rate of hot compression deformation,this research got the microstructure evolution of TC25 G titanium alloy under the conditions of a deformation temperature of 930 ~ 1 020 ℃,strain rate of 0. 001 ~ 50 s-1 and the deformation of 60%. The results show that,the strain rate has little effect on the α phase content and shape,but has a great influence on the β-transformation structure. It is banded at high strain rate and equiaxed at low strain rate. The deformation temperature has a significant effect on the control of α phase content. The α phase content decreases with the increasing of deformation temperature,only 8% at 960 ℃,and the β grain size is relatively coarse at higher deformation temperature.
引文
[1]董洁,王永强,王韦琪,等.TC25钛合金环材β锻造工艺对组织与性能的影响[J].中国有色金属学报,2013,23(专辑1):97-100.
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[7]储茂友,惠松骁,张翥,等.BT25y高温钛合金固溶处理及热暴露过程中硅化物的析出机制[J].电子显微学报,2004,23(2):168-172.
[8]魏鑫,叶康源,叶俊青.冷速对等温锻造TC25钛合金盘件显微组织和性能的影响[J].钛工业进展,2017,34(4):26-29.
[2]王永,卢斌,张钧.热处理对高Mo当量BT25y钛合金显微组织和力学性能的影响[J].金属热处理,2009,34(4):64-68.
[3]杨卫国,王青江,张彩碚,等.BT25y钛合金拉伸强度的当量计算[J].金属学报,2004,40(2):155-158.
[4]王丽瑛,魏寿庸,高博,等.退火制度对TC25钛合金棒材组织和力学性能的影响[J].钛工业进展,2011,28(4):36-38.
[5]白晓环,吕平,徐庆.热处理工艺对BT25钛合金锻件组织与性能的影响[J].钛工业进展,2008,25(5):20-22.
[6]张翥,于洋,惠松骁.BT25y钛合金热稳定性能研究[J].稀有金属,2008,32(6):758-765.
[7]储茂友,惠松骁,张翥,等.BT25y高温钛合金固溶处理及热暴露过程中硅化物的析出机制[J].电子显微学报,2004,23(2):168-172.
[8]魏鑫,叶康源,叶俊青.冷速对等温锻造TC25钛合金盘件显微组织和性能的影响[J].钛工业进展,2017,34(4):26-29.