摘要
主要研究了激光熔覆Ti60合金的工艺参数对成形质量的影响,以及微观组织特征和拉伸性能。结果表明,激光熔覆Ti60合金试样的底部和顶部区域为β等轴晶粒,中部区域为β柱状晶,且尺寸随着激光功率的增加而增大。显微组织主要由板条α相和板间β相构成,且板条α相中有大量白色析出相产生,随着激光功率的增加,微观组织由网篮组织转变为魏氏组织。块体试样的显微硬度分布较为均匀,其硬度值在420~440 HV范围内波动。激光熔覆Ti60合金的室温抗拉强度为1128 MPa,断后延伸率和断面收缩率分别为8.8%和14.4%。当温度为300℃和600℃时,抗拉强度分别为932 MPa和739 MPa,在600℃时,断后延伸率和断面收缩率分别为11.7%和18.2%。激光熔覆Ti60合金试样在室温下的断裂方式为准解理断裂,高温下其断裂方式为韧性断裂。
Objective Ti60 is a near-αtitanium alloy with good high-temperature performance that has been identified as an important candidate material for aero-engine compressor blades and integral blades.However,when high-temperature titanium alloys are fabricated using traditional processing technology,it has the disadvantages of difficult formation,low material utilization,and high cost.Laser cladding technology uses a laser with high energy density to melt the powder preset on the surface of the substrate,so as to obtain the expected performance of the cladding layer.There are many parameters of the laser cladding process that have significant influence on the forming quality.At the same time,complex thermal cycling in the laser cladding process leads to differences in the grain size,morphology,and size of the precipitated phase,which makes the differences in the mechanical properties of the laser cladding significant.Therefore,this paper mainly studies the effect of the process parameters on the forming quality of laser cladded Ti60 alloy,and the microstructure evolution and tensile properties of laser cladded Ti60 alloy are analyzed to lay a theoretical foundation for the application of laser cladded high-temperature titanium alloy components in the aerospace field.Methods The material selected in this experiment is Ti60 powder with a particle size of 50‒150μm,prepared using the plasma rotating electrode process(PREP).TC4 titanium alloy is used as the substrate,and the laser cladding system is used as the laser cladding experiment system.The section of the laser cladded sample along the thickness direction of the cladding layer is machined via electric discharge wire cutting into a flake sample with a thickness of 5 mm for the metallographic sample.The Kroll reagent is then used for etching,and finally,the microstructure is observed using a metallographic microscope and field emission scanning electron microscope(SEM).A field emission transmission electron microscope(TEM)is used to analyze the precipitated phase o
作者
舒宗富
黄春平
张耀祖
刘丰刚
Shu Zongfu;Huang Chunping;Zhang Yaozu;Liu Fenggang(Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;Graduate School,Chinese Aeronautical Establishment,Yangzhou 225003,Jiangsu,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2024年第12期86-96,共11页
Chinese Journal of Lasers
基金
国家自然科学基金(52165050,52265053)
无损检测技术教育部重点实验室(南昌航空大学)开放基金(EW202203364)
江西省研究生创新专项资金(YC2019-S335)。
关键词
激光技术
Ti60高温钛合金
激光熔覆
工艺参数优化
微观组织
拉伸性能
laser technique
Ti60 high temperature titanium alloy
laser cladding
process parameter optimization
microstructure
tensile property
