两相区热处理制度对TC18钛合金等轴化规律的影响  

Effect of heat treatment in two-phase region on equiaxed structure evolution of TC18 alloy

作　　者：刘继雄[1] 马宏刚[1] 李巍[1] 李渭清[1] 王小翔[1] 王鼎春[1] 高颀[1] 

机构地区：[1]宝鸡钛业股份有限公司,陕西宝鸡721014

出　　处：《金属热处理》2015年第5期77-81,共5页Heat Treatment of Metals

摘　　要：利用光学显微镜、扫描电子显微镜研究了TC18钛合金两相区热处理过程中的等轴化规律。结果表明,随两相区加热温度的提高,等轴化速度增大;延长两相区的保温时间,也可以实现等轴化;当温度靠近相变点时,延长保温时间,等轴化效果减弱。两相区保温等轴化的驱动力来源于加工过程畸变能和α→β的相转变。By means of optical microscopy and scanning electron microscopy,the equiaxed variation law is analyzed under different heat treatment processes in two-phase region of TC18 titanium alloy.The results show that with the heating temperature increasing in the two-phase region,the equiaxial speed is accelerated.Prolong the holding time in two-phase region,the equiaxed variation is also observed.When the temperature close to the phase transition point,to prolong the holding time,the equiaxed effect is weakened.The equiaxial driving force is due to the distortion energy during maching process and transformation of α phase to β phase.

关 键 词：TC18钛合金 等轴组织 热处理 两相区 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG166.5[金属学及工艺—金属材料]