GH4169合金摩擦焊规范与成形性能

以高性能航空发动机蜗轮盘和压气机盘为背景，应用能量方法对GH4169合金管状模拟试件的惯性摩擦焊接过程进行了分析与计算，推导出了焊接热力影响区主要热参数的理论计算公式。经编程计算，给出了摩擦焊接区域温度和飞边分流半径的拟合曲线，并分析研究了飞边缺陷的种类及其产生的原因。内缺陷以分流半径为参考，该处存在速度奇异点，不良的工艺规范，会导致裂纹缺陷。中间缺陷以分离半径为参考，该处存在较大的应力集中，从而容易产生裂纹缺陷。外缺陷以飞边半径为参考，当温度较低的飞边外缘处拉应力值达到某一临界值后，就会在翘起的外飞边上产生裂纹缺陷。基于本文方法，可以合理地制定出惯性摩擦焊接规范，从而为提高GH4169合金的成形性能和接头质量创造条件。

On Thermo-mechanical Specification and Deformability of IN-718 Alloy in Friction Welding

Based on the study of the turbo disk and the compressor disk of high quality aero engine,systematical analyses and calculation of the IN 718 superalloy simulated workpieces were carried out in this paper.The energy method is used to predict the behavior of IN 718 tubular specimens with an outside diameter of 11.5mm and inside diameter of 7.5mm during the friction welding and the closed form solution is presented for temperatures developed during heating in weld piece of finite.So theoretical equations of thermo mechanical parameters can be easily got from the energy model.With the equations,curves of separating radius and instantaneous temperatures on different conditions are found.As result of it,the cause of cracks in the jointing of the welding zone is shown.As shown in this paper,the result can be used to lay down thermo mechanical parameters scientifically and improve deformability of IN 718 supperalloy in friction welding.