The Study on ISM Process of Ti-15-3 Alloy

Su Yanqing  Guo Jingjie  Liu Yuan  Ding Hongsheng  Jia Jun

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The Study on ISM Process of Ti-15-3 Alloy
Issue 6, (1999)
Published： 1999 ，
DOI：

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[1]苏彦庆,郭景杰,刘源,丁宏升,贾均.Ti-15-3合金真空感应凝壳熔炼(ISM)过程研究[J].特种铸造及有色合金,1999(06):3-7.

Su Yanqing Guo Jingjie Liu Yuan Ding Hongsheng Jia Jun. The Study on ISM Process of Ti-15-3 Alloy. [J]. Special Casting & Nonferrous Alloys (6).(1999)
[1]苏彦庆,郭景杰,刘源,丁宏升,贾均.Ti-15-3合金真空感应凝壳熔炼(ISM)过程研究[J].特种铸造及有色合金,1999(06):3-7. DOI：

Su Yanqing Guo Jingjie Liu Yuan Ding Hongsheng Jia Jun. The Study on ISM Process of Ti-15-3 Alloy. [J]. Special Casting & Nonferrous Alloys (6).(1999) DOI：

摘要

利用三元系活度系数计算公式

计算了TiV15Al3Cr3Sn3（Ti-15-3）合金熔体中各组元的活度系数

计算结果表明

各组元的活度系数都小于1。利用活度的计算结果进一步研究了Ti-15-3合金真空熔炼时合金元素的挥发行为

结果表明

合金元素的挥发存在临界真空度

在超过这一真空度后合金元素的挥发损失加剧。建立了间隙元素在Ti-15-3合金中溶解的热力学模型

计算了氧在合金中的溶解度

并分析了影响氧元素在Ti-15-3合金中溶解度的因素。计算结果表明

熔炼室间隙元素分压是决定间隙元素含量的主要因素

并开发了降低间隙元素含量的工艺方法

试验结果与计算结果较符合。为了控制合金熔体温度

利用所开发的温度场计算程序

建立了ISM过程熔体温度与熔炼功率、炉料质量间的关系。利用该程序预测了ISM熔炼过程中凝壳形状及尺寸的变化过程

并对该过程进行了试验研究

计算结果与试验结果一致。

Abstract

The activity coefficients in Ti 15 3 melt have been calculated. At 2 000 K

the activity coefficients in Ti 15 3 melt are all less than 1.Taking advantage of the activity coefficients

the evaporation losses of components in Ti 15 3 melt during ISM process have been studied.The calculated results show that there exists a critical vacuum degree during melting process.When the vacuum degree in the vacuum chamber surpasses that value

the evaporation of components takes on a state of free evaporation. A thermodynamic model of dissolution of oxygen in Ti 15 3 alloy is set up and the factors influencing oxygen dissolution are analyzed.The calculation results show that the oxygen partial pressure in the melting chamber is the main factor determining the oxygen dissolution in Ti alloy.A valid method was developed to decrease oxygen content and evaporation of alloy element.The calculated results are in accordance with the experimental results.With the simulation program for ISM process

the relationship between the ultimate temperature in the melt and the melting power

charge weight are set up.The change of the skull shape and size is predicted through the program too.The results show that the skull height and thickness decrease with increasing melting power and the skull is smaller than that remained in crucible after pouring.