摘要
利用功率为500 W的光纤激光器对晶态Ti_(47)Cu_(38)Zr_(7.5)Fe_(2.5)Sn_2Si_1Ag_2合金基体进行了激光重熔实验,研究了不同工艺对熔池形貌及晶化的影响。结果表明,单道重熔的熔池内易获得非晶组织,且随着扫描速度减小,熔池形貌逐渐由球冠状向漏斗状转变。搭接重熔下,扫描宽度较大时重熔区内出现熔道搭接造成的热影响区晶化带;扫描宽度较小时由于热累积效应显著,熔池展宽和扫描宽度接近,重熔区内基本为非晶态。面扫描过程中,由于热累积匙孔效应更突出,熔池熔深显著增大,熔池底部出现少量气孔。
The experiment of laser remelting of crystalline Ti47Cu38Zr7.5Fe2.5Sn2Si1Ag2alloy matrix by a fiber laser with a power of 500 Wis conducted,and the effects of different processes on the molten pool morphology and crystallization are investigated.The results show that,as for the single track remelting process,the amorphous microstructure occurs easily in the molten pool and the molten pool morphology is gradually transformed from the coronal shape to the funnel shape with the decrease of scanning speed.As for the overlap remelting process,the crystallization belt in the heat-affect zone induced by weld overlap is formed in the remelting zone when the scanning width is large,but when the scanning width is relatively small,the pool width is close to the scanning width and the remelting zone is basically amorphous due to the significant heat accumulation effect.In the surface scanning process,the keyhole effect is prominent due to thermal accumulation,the penetration depth of molten pool increases significantly,and there occurs a small amount of pores at the bottom of molten pool.
作者
姚建华
刘克元
叶正挺
方铮
张群莉
杨高林
Yao Jianhua;Liu Keyuan;Ye Zhengting;Fang Zheng;Zhang Qunli;Yang Gaolin(Institute of Laser Advanced Manufacturing,Zhejiang University of Technology Hangzhou,Zhejiang 310014,China;Zhejiang Provincial Collaborative Innovation Center of High-End Laser Manufacturing Equipment,Hangzhou,Zhejiang 310014,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2018年第8期93-101,共9页
Chinese Journal of Lasers
基金
凝固技术国家重点实验室开放课题(SKLSP201745)
浙江省自然科学基金(LY16E050014)
关键词
激光技术
激光重熔
非晶合金
形貌
晶化
laser technique
laser remelting
amorphous alloy
morphology
crystallization
