摘要
主要研究Fe含量对TC4钛合金显微组织和力学性能的影响。对比分析了添加w_(Fe)=0.05%的TC4试样1和添加w_(Fe)=0.23%的TC4试样2经过相同锻造及热处理后的室温拉伸、400℃高温拉伸、室温冲击试验结果及金相显微组织。结果表明:增加w_(Fe)≈0.2%后,初生α相含量降低约9%。次生α相片层厚度增加且呈交叉混乱排列。室温拉伸、室温冲击和400℃高温拉伸的强度显著提高,室温抗拉强度和屈服强度增加约55MPa。400℃高温抗拉强度增加约30MPa。这是因为在拉伸过程中,位错滑移过程中所遇到的阻碍增大,导致大量位错塞积在弥散的强化相中;同时随着Fe元素增加,与钛合金形成固溶体时产生较大的晶格畸变,也能提高钛合金的强度,但对室温拉伸和400℃高温拉伸的塑性无明显影响。
This article mainly studies the effect of Fe content on the microstructure and mechanical mroperty of TC4 titanium alloy.Comparative analysis was conducted on the room temperature tension,400℃high temperature tension,room temperature impact,and metallographic microstructure of TC4 sample 1 with 0.05%Fe added and TC4 sample 2 with 0.23%Fe added after the same forging and heat treatment.The results indicate that increasing the Fe content(about 0.2%,mass fraction)is beneficial for primary growthαphase content decreased by about 9%.And secondaryαphase thickness increases and they are arranged in a chaotic and intersecting manner.The strength of room temperature stretching,room temperature impact,and 400℃high temperature stretching is significantly improved.The tensile strength and yield strength at room temperature increased by approximately 55MPa.The tensile strength increased by about 30MPa for 400℃high-temperature stretching.This is because during the stretching process,the obstacles encountered during the slip of dislocations are enhanced,resulting in a large number of dislocations accumulating in the dispersed strengthening phase;At the same time,with the increase of Fe element,significant lattice distortion occurs when forming a solid solution with titanium alloy,which can also improve the strength of titanium alloy.But it has no significant effect on the plasticity of room temperature stretching and 400℃high-temperature stretching.
作者
白家元
杨家典
瞿兆银
牟旭祥
BAI Jiayuan;YANG Jiadian;QU Zhaoyin;MU Xuxiang(Guizhou Aviation Technology Development Co.,Ltd.,Guiyang 550081,Guizhou,China)
关键词
TC4钛合金
力学性能
Fe含量
显微组织
TC4 titanium alloy
mechanical property
Fe element content
microstructure
