退火温度对TC4钛合金热轧板材的显微组织、织构和力学性能影响  

Effect of Anneal Treatment on Microstructure,Texture and Mechanical Properties of TC4 Alloy Plates

作　　者：王伟[1,2] 周山琦 宫鹏辉 张浩泽 史亚鸣 王快社 WANG Wei;ZHOU Shanqi;GONG Penghui;ZHANG Haoze;SHI Yaming;WANG Kuaishe(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Yunnan Titanium Industry Co.,Ltd,Chuxiong 651209,China;School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]云南钛业股份有限公司,楚雄651209 [3]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《材料研究学报》2023年第1期70-80,共11页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51975450)。

摘　　要：对用电子束冷床炉(EB炉)熔炼的TC4钛合金热轧板材进行三火轧制变形,研究了退火温度对其显微组织、织构和力学性能的影响。结果表明:TC4钛合金的原始轧态组织为双态组织,由初生α相和β转变组织构成。退火后等轴α相的含量提高,次生α相的含量降低并趋于球化,组织的等轴化程度提高,在900℃退火后合金的显微组织转变为等轴组织。随着退火温度的提高α相晶粒的偏聚方向发生了变化,织构类型由初始的B型织构转变为B型织构与T型织构的混合织构类型,最终再转变为B型织构。在800℃退火后α晶粒的择优取向最弱,其织构类型为B型织构和T型织构组成的混合织构,较强织构的成分为:φ2=0°截面,■;φ2=30°截面,■。对材料进行室温和高温(400℃)拉伸实验,可得到TC4钛合金强度及塑性与退火温度间的关系:退火温度的提高使合金的抗拉强度提高、屈服强度降低、改善了塑性,合金屈强比的降低使其可靠性提高。The effect of the anneal temperature on the microstructure,micro-texture and mechanical properties of the hot rolled Ti-6Al-4V alloy were investigated.The results show that the as rolled Ti-6Al-4V alloy presents a bimodal microstructure.The content of equiaxedα-phase increased after annealing.The content of secondaryα-phase tented to decrease,whilst to be gradually spheroidized.The microstructure transformed into equiaxed structure after annealing at 900℃.With the increase of anneal temperature,the preferred orientation ofα-phase were changed.Correspondingly,the micro-texture changed from Btype to mixed texture,then to B-type again.The crystal directions dispersed when the sample anneal at 800℃.The texture consisted of■.The relationship between the mechanical performance and the annealing temperature were assessed via tensile tests.It follows that with the increased of annealing temperature,the tensile strength increased but the yield strength decreased,spontaneously,the ratio of yield strength to tensile strength decreased.In a word,the comprehensive mechanical properties of the alloy may be enhanced through proper annealing process.

关 键 词：金属材料 TC4钛合金 织构 退火 力学性能 电子束冷床熔炼 

分 类 号：TG146.23[一般工业技术—材料科学与工程]