Precipitation location of secondary phase and microstructural evolution during static recrystallization of as-cast Ti-25V-15Cr-0.3Si titanium alloy  

铸态Ti-25V-15Cr-0.3Si钛合金静态再结晶过程中的二次相析出位置及显微组织演变（英文）

作　　者：Yan-chun ZHU Qing-xue HUANG Xiao-hui SHI Mei-rong NHUAI Wei-dong ZENG Yong-qing ZHAO Zhi-quan HUANG Li-feng MA 朱艳春;黄庆学;石晓辉;帅美荣;曾卫东;赵永庆;黄志权;马立峰(太原科技大学太原重型机械装备协同创新中心,太原030024;太原理工大学材料科学与工程学院,太原030024;西北工业大学凝固技术国家重点实验室,西安710072;西北有色金属研究院,西安710016)

机构地区：[1]Collaborative Innovation Center of Taiyuan Heavy Machinery Equipment,Taiyuan University of Science and Technology,Taiyuan 030024,China [2]School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [3]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi＇an 710072,China [4]Northwest Institute for Nonferrous Metals Research,Xi＇an 710076,China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第8期1521-1529,共9页中国有色金属学报（英文版）

基　　金：Projects(51501122,51604181) supported by the National Natural Science Foundation of China;Project(20172009) supported by the Postdoctoral Sustentation Fund of Taiyuan University of Science and Technology,China;Project(20132016) supported by the Research Fund for the Doctoral Program of Higher Education of China;Project(201501004-8) supported by the Jincheng Science and Technology Plan Project,China;Project(U1510131) supported by NSFC-Shanxi Coal-based Low-carbon United Fund and"Shanxi Young Scholars"Program,China;Project(201603D121010) supported by Key R&D Program of Shanxi Province,China

摘　　要：The microstructural evolution and precipitation location of the secondary phase of an as-cast Ti-25 V-15 Cr-0.3 Si titanium alloy were investigated via isothermal compression experiments and heat treatment. The average aspect（length-to-width） ratio, average area and size of the grains at different heat treatment temperatures and holding time were analyzed and the effects of deformation and annealing time on the grain area and size were considered. It was found that the grain size was strongly influenced by the height reduction and holding time. Grain growth was significant when annealing time increased from 10 min to 2 h at 950 °C and height reduction of 30%; however, grain growth was minimal at annealing time between 2 and 4 h. Many dispersion particles were observed to form in continuous chains; the precipitation location was confirmed to be along initial grain boundaries, and the dispersion particles were identified to be Ti5 Si3 phase by TEM.利用热压缩和热处理实验研究铸态Ti-25V-15Cr-0.3Si钛合金的显微组织演变和二次相析出位置。研究在不同热处理温度和时间下晶粒的平均长宽比、平均面积和尺寸,分析变形量和退火参数对晶粒面积和尺寸的影响。结果表明,晶粒尺寸受变形量和退火时间影响显著,在950°C、变形量为30%、当退火时间从10 min增加至2 h时,晶粒明显长大;而当退火时间为2~4 h时,晶粒长大缓慢。此外,还观察到大量弥散质点以连续的链状存在,显微组织观察和TEM衍射花样分析证实沿着原始晶界析出的弥散质点为Ti_5Si_3相。

关 键 词：Ti-25V-15Cr-0.3Si titanium alloy  static recrystallization microstructural evolution grain size secondary phase precipitation location 

分 类 号：TG146.23[一般工业技术—材料科学与工程]