Ti55511钛合金的电子束冷床熔炼技术研究  

Melting technology of electron beam cold hearth melting of Ti55511 titanium alloy

作　　者：杜彬 王龙 曹寿林 马小艳 田成良 张炜华 DU Bin;WANG Long;CAO Shoulin;MA Xiaoyan;TIAN Chengliang;ZHANG Weihua(Technology R and D Department,Qinghai Supower Titanium Co.,Ltd.,Xining 810007,Qinghai,China;Titanium and Titanium Alloys Engineering Research Center of Qinghai Province,Xining 810007,Qinghai,China)

机构地区：[1]青海聚能钛业股份有限公司技术研发部,青海西宁810007 [2]青海省钛及钛合金工程技术研究中心,青海西宁810007

出　　处：《金属功能材料》2022年第4期28-36,共9页Metallic Functional Materials

基　　金：国家工业强基工程项目(TC150B5C0);青海省科技成果转化专项资助项目(2019-GX-105)。

摘　　要：利用新型的1350 kW型电子束冷床熔炼(EB)炉熔炼制备Ti55511钛合金铸锭,分析了不同熔炼工艺参数下的铸锭化学成分均匀性,针对熔炼过程中合金元素的挥发特性,采用Langmuir定律建立了Ti55511钛合金EB熔炼过程熔体中各元素饱和蒸气压及挥发规律的数学模型,并根据实际挥发率进行了相关热力学参数的验证性分析。结果表明:Ti55511钛合金EB炉熔炼过程中Al、Cr元素的实际挥发率分别达到12.63%和30.77%,Cr元素挥发严重,实际挥发率与挥发模型吻合度较高。1350 kW型电子束冷床熔炼(EB)炉的最佳熔炼速度为0.969×10^(-4)m/s(即178.08 kg/h),在此工艺下铸锭化学成分均匀性良好,完全符合国标GB/T 3620.1-2016的要求。Ti55511 titanium alloy ingot were prepared by using 1350 kW electron beam cold hearth melting(EB)furnace,and the homogeneity of the chemical composition of the ingot under different melting process parameters was analyzed.According to the volatilization characteristics of the alloy elements in the smelting process,the mathematical model of saturated vapor pressure and volatilization law of various elements in EB melting process of Ti55511 titanium alloy was established by using Langmuir law.And the relevant thermodynamic parameters were verified according to the actual volatilization rate.The results showed that the actual volatilization rate of Al and Cr reaches 12.63% and 30.77% respectively during EB furnace melting process of Ti55511 titanium alloy.The volatilization of Cr is seriously,and the actual volatilization rate is in good agreement with the volatilization model.The optimum melting speed of the 1350 kW electron beam cooling hearth melting(EB)furnace is 0.969×10^(-4) m/s(178.08 kg/h).Under this process condition,the chemical composition of the ingot has good uniformity and fully meets the requirements of GB/T 3620.1-2016.

关 键 词：Ti55511钛合金 电子束冷床熔炼 挥发率 成分均匀性 

分 类 号：TG292[金属学及工艺—铸造]