###
DOI:
钛工业进展:2019,36(5):18-22
本文二维码信息
码上扫一扫!
C元素添加对近β钛合金显微组织及力学性能的影响
Effect of C Addition on Microstructure and Mechanical Properties of Near Beta Titanium Alloy
摘要
图/表
参考文献
相似文献
本文已被:浏览 20次   下载 0
    
中文摘要: 研究了在不同热处理条件下C元素的添加量对近β钛合金Ti-4Al-5Mo-8V-2. 5Cr-1Sn-2Zr微观组织及力学性能的影响。结果表明:C元素添加对近β钛合金在不同热处理条件下的微观组织均有显著影响。C元素添加会导致β晶粒的细化,当C元素添加量由0%(体积分数,下同)增加到3%时,固溶处理后合金的β晶粒尺寸由137μm降低至25μm,且尺寸更加均匀。当C元素添加量持续增加时,β晶粒开始长大。经时效处理后,随着C元素添加量的增加,次生α相尺寸和体积分数均减小。相比于单级时效,双级时效呈现出更多的次生α相。此外,单级时效后晶界处的次生α相会随着C元素添加量的增加而逐渐消失。由于受晶粒细化、TiC颗粒和次生α相的影响,随着C元素添加量的增加,合金的显微硬度和拉伸强度明显提高,塑性降低。
中文关键词: 近β钛合金    TiC    热处理    组织演变    显微硬度
Abstract:The effects of trace carbon element on microstructure and mechanical properties of a near beta titanium alloy Ti-4Al-5Mo-8V-2. 5Cr-1Sn-2Zr through various heat treatment were studied. The results show that the addition of carbon element has a significant effect on the microstructure after different heat treatments. The addition of carbon leads to the refinement of beta grains. And after the solution treatment,the size of beta grains decrease from 137 μm to 25 μm and becomes more uniform with the increasing of carbon volume fraction from 0% to 3%. And beta grains begin to grow as the carbon content continues to increase. After aging treatment,the size and volume fraction of secondary alpha phase decreases with the increasing of carbon. Compared with the samples after single-aging treatment,the samples after double-aging treatment present the more secondary alpha phase. Additionally,with the increase of carbon,grain boundary alpha phase reduces gradually through single-aging treatment. Due to the influence of grain refinement,Ti C particles and secondary alpha phase,with the increase of carbon,the micro-hardness and tensile strength of the alloy increased significantly,but the ductility decreases.
文章编号:     中图分类号:    文献标志码:
基金项目:国家自然科学基金项目(51504163);; 山西省自然科学基金项目(201801D221141,201801D121091);; 山西省高等学校科技创新计划项目(201802021)
引用文本:


用微信扫一扫

用微信扫一扫