热处理工艺对V-Ti-Ni氢分离合金显微组织和硬度的影响
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摘要
在真空氩弧熔炼炉中制备V60Ti20Ni20合金,采用硬度测试、金相显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)和能谱(EDS)分析技术,研究热处理温度和时间对V60Ti20Ni20合金显微组织和硬度的影响。结果表明,铸态V60Ti20Ni20合金由枝晶相V基固溶体以及枝晶间相Ni Ti和Ni Ti2组成。合金铸锭在热处理保温15和18 h时,随着热处理温度升高和保温时间的延长,Ti,Ni原子从枝晶相扩散至枝晶间区域速率增大,扩散量增加,导致V基体晶格畸变度逐渐减小,同时枝晶间Ni Ti2相尺寸逐渐变细小和均匀,合金硬度随之降低。热处理保温时间延长至21 h时,合金随热处理温度升高,Ti,Ni原子回溶到枝晶相,V基体晶格畸变度增大,同时枝晶间Ni Ti2相聚集、分布不均匀,尺寸逐渐增大,因此合金硬度反而随之升高。
The V60 Ti20 Ni20 alloy was prepared in a vacuum/argon arc melter. The effects of heat treatment temperature and time on the microstructure and hardness of V60 Ti20 Ni20 alloy were investigated by hardness test,metallographic microscope,X-ray diffraction( XRD),scanning electron microscopy( SEM) and energy dispersive spectroscopy( EDS). The results showed that the as-cast V60 Ti20 Ni20 alloy consisted of dendritic V-based solid solution and interdendritic phases Ni Ti and Ni Ti2. With the increase of heat treatment temperature and time,the rate of diffusion of Ti and Ni atoms from dendrite phase to interdendritic zone and the diffusion quantity increased when the alloys were heat treated for 15 and 18 h,leading to that the lattice distortion of V matrix gradually decreased,while the size of Ni Ti2 phase gradually became smaller and more uniform,and the hardness of the alloys decreased accordingly. When heat treatment time was extended to 21 h,the Ti and Ni atoms dissolved into the dendrite phase with temperature increasing,the lattice distortion of the V matrix increased,and the interdendritic Ni Ti2 phases accumulated and the size gradually increased,therefore,the hardness of the alloy instead increased accordingly.
The V60 Ti20 Ni20 alloy was prepared in a vacuum/argon arc melter. The effects of heat treatment temperature and time on the microstructure and hardness of V60 Ti20 Ni20 alloy were investigated by hardness test,metallographic microscope,X-ray diffraction( XRD),scanning electron microscopy( SEM) and energy dispersive spectroscopy( EDS). The results showed that the as-cast V60 Ti20 Ni20 alloy consisted of dendritic V-based solid solution and interdendritic phases Ni Ti and Ni Ti2. With the increase of heat treatment temperature and time,the rate of diffusion of Ti and Ni atoms from dendrite phase to interdendritic zone and the diffusion quantity increased when the alloys were heat treated for 15 and 18 h,leading to that the lattice distortion of V matrix gradually decreased,while the size of Ni Ti2 phase gradually became smaller and more uniform,and the hardness of the alloys decreased accordingly. When heat treatment time was extended to 21 h,the Ti and Ni atoms dissolved into the dendrite phase with temperature increasing,the lattice distortion of the V matrix increased,and the interdendritic Ni Ti2 phases accumulated and the size gradually increased,therefore,the hardness of the alloy instead increased accordingly.
引文
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