电冲击预处理下的316不锈钢构筑成形界面愈合行为模拟与实验研究

Simulation and experimental study on interface healing behavior of 316 stainless steel construction forming under electric shock pretreatment

为保证构筑界面的高质量连接,提出了在高温变形调控界面愈合的基础上引入电冲击前处理的方法来促进构筑界面的愈合,并通过对316不锈钢高温变形前进行电冲击预处理的仿真和实验,揭示电冲击前处理对构筑界面愈合程度的作用规律。研究结果表明,提高电冲击前处理时的电流密度,构筑成形试样界面的愈合效果逐步提高,但电冲击前处理的电流密度不宜过大,关键在于更大程度地实现构筑界面处的温度梯度变化,产生向中心挤压的热压应力,才能够促进构筑界面产生局部预连接。

In order to ensure the high-quality connection of construction interface,a method of adding electrical shock pretreatment on the basis of high-temperature deformation controling interface healing was proposed to promote the healing of construction interface.Then,by simulations and experiments on the electrical shock pretreatment before high-temperature deformation of 316 stainless steel,the influence of electrical shock pretreatment on the degree of construction interface healing was revealed.The research results show that increasing the current density during electrical shock pretreatment gradually improves the construction interface healing effect of formed sample.However,when selecting the current density for electrical shock pretreatment should not be excessively high.The key is to achieve a greater degree of temperature gradient change at the construction interface and generate thermal compressive stress towards the center,which could promote local pre-connection at the construction interface.