Fe代替V制备低成本钛合金:相体积分数的计算  

Preparation of low-cost titanium alloys using Fe instead of V:Calculation of phase volume fraction

作　　者：王亮[1] 颜卉 陈云[1] 骆良顺[1] 苏彦庆[1] 郭景杰[1] WANG Liang;YAN Hui;CHEN Yun;LUO Liangshun;SU Yanqing;GUO Jingjie(National Key Laboratory for Precision Hot Forming of Metals(Harbin Institute of Technology),Harbin 150001,China)

机构地区：[1]金属精密热加工国家级重点实验室(哈尔滨工业大学),哈尔滨150001

出　　处：《哈尔滨工业大学学报》2021年第8期17-21,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51871075)。

摘　　要：钛合金因其优异的综合性能,如比强度高、耐热性强、耐腐蚀性能优异、低温性能好等特点,而被应用在航天、航空、航海等诸多领域,然而钛合金的高成本严重制约了其大规模的使用。本文以综合性能最好、使用最广泛的Ti-6Al-4V合金为基础,在使用廉价合金元素代替昂贵合金元素的思路下,设计了几组V、Fe元素含量不同的Ti-Al-V-Fe合金。借助稳定系数Kβ,分析钛合金中β相的稳定程度和β稳定元素的作用,通过理论推导的方法建立了合金淬火态和退火态的β元素临界晶胞系数的计算模型,并在此基础上确立了α相与β相的体积分数的计算方法,从而实现了对Ti-Al-V-Fe合金中相体积分数的理论计算。本文以Ti-6Al-3V-1Fe合金为例,首先对合金内α相与β相的体积分数分别做了理论计算,继而利用真空非自耗电弧熔炼炉制备了Ti-6Al-3V-1Fe合金的铸锭,取样并进行热处理,最终利用X射线衍射法测定了Ti-6Al-3V-1Fe合金淬火态和退火态α相与β相的实际体积分数。对比发现,实验测定的结果与理论计算的结果较为吻合,说明建立的模型用于预测α相与β相两相的体积分数是切实可行的。Titanium alloy is employed in aerospace,aviation,navigation,and other fields because of its excellent comprehensive properties,such as high specific strength,strong heat resistance,excellent corrosion resistance,and good low temperature performance.However the high cost of titanium alloy seriously restricts its large-scale application.Based on Ti-6Al-4V alloy which has the best comprehensive properties,several Ti-Al-V-Fe alloys with different contents of V and Fe were designed under the guideline of using cheap alloy elements instead of expensive alloy elements.With the help of the stability factor Kβ,the stability ofβphase and the effect ofβstabilizing elements were analyzed.The calculation models for critical cell coefficients ofβstabilizing elements of quenched alloys and annealed alloys were established by theoretical derivation.On this basis,the calculation methods for volume fraction ofαphase andβphase were established,and the theoretical calculation of the volume fraction ofαphase andβphase in Ti-Al-V-Fe alloy was realized.Taking Ti-6Al-3V-1Fe alloy as an example,the theoretical volume fraction ofαphase andβphase in the alloy was calculated.Then,Ti-6Al-3V-1Fe alloy ingots were prepared by vacuum non-consumable arc melting furnace.Samples were taken and heat treated.Finally,the volume fraction ofαphase andβphase in the alloy was determined by X-ray diffraction.It was found that the measured results were in good agreement with the theoretical calculation results,indicating that the established model is feasible to predict the volume fraction ofαphase andβphase.

关 键 词：Ti-Al-V-Fe合金 相体积分数 计算模型 

分 类 号：TG146.23[一般工业技术—材料科学与工程]