强流脉冲电子束表面改性镍基合金的研究  

Surface Modification of Ni-Based Alloy by High Current Pulsed Electron Beam (HCPEB)

作　　者：邹慧 唐晓薇 张科举 Zou Hui;Tang Xiaowei;Zhang Keju(Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance,Tianjin 300300,China;Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学天津市民用航空器适航与维修重点实验室

出　　处：《真空科学与技术学报》2019年第12期1144-1148,共5页Chinese Journal of Vacuum Science and Technology

基　　金：中央高校基本科研业务费专项资金项目(3122016L014)

摘　　要：DZ22合金因其优良的高温性能被广泛的应用于高温热端构件。为了进一步提高DZ22合金表面性能,使用强流脉冲电子束对其表面进行轰击。本文主要讨论温度场模拟及微观组织状态。采用abaqus模拟软件对轰击时DZ22镍基合金表面的温度场进行模拟。模拟结果表明,轰击时试样表面在0.68μs时达到轰击时表面的最高温度1629℃,超过DZ22镍基高温合金熔点。利用激光共聚焦显微镜对轰击前后合金表面形貌进行观测,实验结果显示,轰击后试样表面产生熔坑形貌。利用X射线衍射仪对轰击前后合金表面组织结构进行分析,实验表明,轰击使合金表面应力状态与晶粒的生长方向发生改变。结果表明,轰击使得DZ22合金表面出现熔坑形貌且改变其晶粒方向。Due to the excellent performance of nickel-base superalloy in high temperature,it is widely used in thermal protection structure.In order to improve its surface properties,bombard its surface with high current pulsed electron beam(HCPEB).This article focuses on temperature field simulation and microstructure.With the help of abaqus,simulate the temperature field on the surface of the DZ22 nickel-base alloy during bombardment.The simulation results show that the surface temperature is 1629°C when the time after bombardment reaches 0.68 μs,which exceeds the melting point of DZ22 nickel-based superalloy.Based on a laser confocal microscope,observe the surface morphology of the alloy before and after bombardment.The experimental results showed that the surface of the specimen after bombardment produced a crater morphology.X-ray diffraction analysis of the microstructure on the surface of the alloy before and after bombardment shows that bombardment changes the stress state of the alloy and the grain growth direction.The results show that the bombardment causes the crater morphology on the surface of the DZ22 alloy and changes its grain orientation.

关 键 词：强流脉冲电子束 镍基高温合金 温度场模拟 微观形貌 组织结构 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG132.23[金属学及工艺—金属材料]