选区激光熔化GH3536高温合金高温本构模型

High temperature constitutive model for superalloy GH3536 by selective laser melting

为研究选区激光熔化高温合金在高温下的塑性变形行为,对选区激光熔化制备的热等静压态GH3536高温合金进行热模拟压缩试验,获得了不同变形条件(变形温度为900、950、1000和1050℃;应变速率为0.01、0.1、1和10 s^(-1))下的高温真应力-真应变曲线,研究了该材料在高温条件下的载荷响应规律,并建立了基于Arrhenius方程的材料高温本构模型。研究发现,峰值应力随着应变速率的升高而升高,随着变形温度的升高而降低,最大峰值应力为592.8 MPa。基于Arrhenius方程建立了HIP状态下GH3536高温合金的高温本构方程,其预测精度的平均相对误差(AARE)为9.42%。通过组织观察发现,在高温变形过程中合金的组织被拉长,材料中有明显发生动态再结晶的迹象。

To study the plastic deformation behavior of selective laser melting superalloy at high temperature,the thermal simulation compression test of HIP state superalloy GH3536 prepared by selective laser melting was carried out,and the true stress-true strain curves at high temperature under different deformation conditions(the deformation temperatures of 900,950,1000 and 1050℃and the strain rates of 0.01,0.1,1 and 10 s^(-1))were obtained.Then,the load response laws of the material under high temperature conditions were studied,and the high temperature constitutive model of the material based on Arrhenius equation was established.The results show that the peak stress increases with the increasing of strain rate and decreases with the increasing of deformation temperature,and the maximum peak stress is 592.8 MPa.Based on Arrhenius equation,the high temperature constitutive equation for superalloy GH3536 in HIP stabe is established,which can predict the stress of the material well,and the average relative error of the overall prediction is 9.42%.Through microstructure observation,it is found that the microstructure of the alloy is elongated during high temperature deformation process,the obvious trace of dynamic recrystalization con be observed.