摘要
为研究热处理对Ti-22Al-25Nb-2V合金显微组织及性能的影响,采用粉末冶金法制备Ti-22Al-25Nb-2V合金,1 100℃固溶处理后,在700~850℃进行时效处理,测试合金的显微硬度、相对密度和压缩强度等物理性能,并对合金微观形貌进行观察分析。结果表明:固溶处理合金显微组织由大量β/B2相和少量α2相组成;V元素的添加,提高了相的转变温度、增加了合金的β相稳定性并促进了O相的形成,使时效处理过程中O相从基体B2相析出,形成三相组织;随时效温度的增加,合金的相对密度和显微硬度降低,压缩强度和屈服强度先降低后升高。700℃时效处理合金塑性与硬度均达到最高,800℃时效处理合金压缩强度和屈服强度最低,850℃时效处理合金硬度最低为316 HV。
In order to explore the effect of heat treatment on the microstructure and properties of Ti-22Al-25Nb-2V alloy,Ti-22Al-25Nb-2V alloy was prepared by powder metallurgy method.After solution treatment at 1 100℃,aging treatment was carried out at 700~850℃.The physical properties such as microhardness,relative density and compressive strength of the alloy were tested,and the microstructure of the alloy was observed and analyzed.The results show that the microstructure of the solution treated alloy consists of a large number ofβ/B2 phases and a small amount ofα2 phases;the addition of V element increases the phase transition temperature,and theβphase stability of the alloy and promotes the formation of O phase.During the aging treatment,the O phase precipitates from the matrix B2 phase to form a three-phase structure.As the aging temperature increases,the relative density and microhardness of the alloy decrease,and the compressive strength and yield strength decrease first and then increase.The plasticity and hardness of the alloy at 700℃aging treatment are the highest,the compressive strength and yield strength of the alloy are the lowest at 800℃,and the hardness of the alloy at 850℃is 316 HV.
作者
胡新煜
张娇娇
王俊勃
李笑然
赵康
黄晟
司鹏伟
HU Xinyu;ZHANG Jiaojiao;WANG Junbo;LI Xiaoran;ZHAO Kang;HUANG Sheng;SI Pengwei(School of Materials Science and Science and Engineering,Xi′an University of Technology,Xi′an 710048,China;School of Material Engineering,Xi′an Polytechnic University,Xi′an 710048,China)
出处
《西安工程大学学报》
CAS
2019年第4期446-451,共6页
Journal of Xi’an Polytechnic University
基金
陕西省教育厅重点研发计划项目(2018GY-110)
