TC17钛合金加热过程中的有限元模型

The FEM model of heating process for TC17 alloy

摘要:

本文采用深埋热电偶动态测量坯料温度变化并耦合有限元模拟建立了TC17钛合金的加热模型,对其升温过程进行了模拟。结果表明：总换热系数由辐射换热系数和对流换热系数组成,可通过数学运算获得,其数值与坯料温度有关,随坯料温度增加,总换热系数呈增大趋势。通过对Ф500×500mm规格坯料的升温过程进行有限元模拟,获得坯料心部和半径处的温升曲线,经过与热电偶测得的实际温升曲线对比,模拟曲线与实测曲线有较高的吻合度,坯料心部和半径处到温时间分别为196min和166min。采用小尺寸试样进行β单相区加热试验,通过大尺寸坯料β晶粒尺寸的比较,验证了有限元模型的准确性。

Abstract:

In this paper, the heating model of TC17 titanium alloy was established by dynamic measurement of temperature for the billet with deep buried thermocouple coupled with finite element simulation and the heating process was simulated. The results show that the total heat transfer coefficient is composed of radiation heat transfer coefficient and convection heat transfer coefficient, which can be obtained by mathematical calculation. The value of total heat transfer coefficient is related to the billet temperature and increases with the increase of billet temperature. The temperature rise curves at the center and radius of the billet were obtained after the simulation of billet with dimensions Ф500×500mm. The simulation curves were in good agreement with the measured curves compared with the actual temperature rise curves measured by thermocouples. Time required to reach the set temperature at the center and radius of the billet was 196 min and 166 min respectively. The heating test with small-size sample was done in β zone and the accuracy of the finite element model is verified by comparing the beta grain sizes of large-sized billets.