优化镍基高温合金X-750热处理工艺参数的非线性超声无损评估方法

Abstract

为了获得更好的材料性能,需要对热处理工艺参数进行精确地优化。非线性超声无损检测技术是一种可以有效表征材料微观结构状态变化的评估方法,可以用来评估、优化热处理工艺参数。利用非线性超声波对热处理后的X-750合金材料进行评估,根据超声传播的非线性响应不同,对材料的性能变化做出判断,并与线性超声检测技术的评估结果进行了对比研究。研究发现经过热处理之后,材料性能显著提高,在其中传播的超声非线性响应则明显下降。材料经过热处理后性能提升越大,其声学非线性响应就会变得越小。根据超声波传播的非线性响应定性评估了3种不同的热处理工艺,明确了最优的镍基高温合金X-750退火工艺参数。研究证实了非线性超声方法的敏感度优于传统的线性超声评估方法,可以对材料的热处理效果进行无损评估,从而对热处理工艺参数进行优化与完善。

It is necessary to optimize heat treatment process parameter to achieve better material properties of metallic materials.Nonlinear ultrasonic nondestructive evaluation technology is an effective approach to characterize the material's microstructural change,which can be used to evaluate and optimize heat treatment process by nonlinear ultrasonic waves.Nonlinear ultrasonic method is used to evaluate the heat treated X-750 alloy material.Material properties of specimens after heat treatments are evaluated and predicted by the acoustic nonlinear responses of ultrasonic wave propagation.Conventional linear ultrasonic approaches are also used to make comparisons.It is found that the material properties are significantly improved after heat treatment,and better material properties correspond to less nonlinear response of ultrasound propagation.The qualitative evaluation of three different heat treatment processes for X-750 alloy is provided by ultrasonic nonlinear response in the specimens and shows the optimal heat treatment process for this materials.It can be concluded that the nonlinear acoustic technique can be used to evaluate the heat treatment condition nondestructively and to optimize the process with the improved sensitivity compared with conventional linear ultrasonic approach.