Al2O3陶瓷/不锈钢组件激光切割工艺及重铸层微观组织研究

Study on Laser Cutting Process and Microstructure of Recast Layer of AlO Ceramic/Stainless Steel Components

针对乏燃料后处理首端解体的需求,研究了采用光纤激光器对Al2O3陶瓷/不锈钢组件进行激光切割的工艺、重铸层表面微观形貌及晶体结构。采用多组单因素实验,对比研究了激光功率、离焦量、切割速度对切割质量的影响规律,在本研究中最佳工艺参数为激光功率2.4 kW、切割速度0.8 m/min、离焦量-9 mm、氮气辅助气压10 Bar。通过SEM观察了切割后陶瓷体重铸层表面及横截面微观形貌,发现了重铸层内结构缺陷及其与基材之间微观组织形态与尺寸的差异,并分析了重铸层微观组织的形成机理。本研究有助于激光解体技术在乏燃料后处理上应用的推广。

Aiming at the demand of disintegration of spent fuel post-treatment,the laser cutting process of Al2O3 ceramic/stainless steel components and the surface morphology and crystal structure of recast layer were studied.The effects of laser power,defocusing amount and cutting speed on cutting quality were compared by using multiple sets of single factor experiments.The best process parameters in this study were laser power 2.4 kW,cutting speed 0.8 m/min,defocusing amount-9 mm,nitrogen pressure 10 Bar.The surface and cross-section microstructure of the recast layer after laser cutting were observed by SEM.The structural defects in the recast layer and the difference in microstructure between the recast layer and substrate were found.The formation mechanism of the microstructure of the recast layer was also analyzed.This study contributes to the promotion of laser disintegration technology for spent fuel reprocessing.