GH4169合金管材正挤压工艺优化的数值模拟

Numerical simulation for optimization of the extrusion process of GH4169 tubes

摘要: 结合GH4169在不同温度、应变速率下的真应力-应变曲线,应用Msc.Superform有限元软件对GH4169合金管材正挤压进行了数值模拟,系统分析讨论不同挤压参数对挤压过程的影响.结果表明:GH4169合金管材可以通过热正挤压成形,当挤压速度为100 mm·s^-1和300 mm·s^-1,模角为20～30°,坯料预热温度为1040～1 050℃时,以及在良好的润滑条件下可以获得优化可控的挤压工艺.

Abstract: The hot extrusion process of GH4169 superalloy tubes was simulated by using Msc.Superform software with the true flow stress-true strain curves of GH4169 alloy at different temperatures and strain rates.The effects of technical parameters on the extrusion processing were systematically analyzed to optimize the extrusion process.The results show that high quality products can be expected using forward extrusion.The optimal parameters are the extrusion speed of 100 and 300 mm·s^-1,the die angle of 20 to 30°,the billet preheating temperature of 1 040 to 1 050 ℃ and a better lubrication condition.