Experimental investigation on the spiral trepanning of K24 superalloy with femtosecond laser

被引：50
作者：
Wang, Maolu [1 ]
Yang, Lijun [1 ]
Zhang, Shuai [1 ]
Wang, Yang [1 ]
机构：
[1] Harbin Inst Technol, Sch Mechatron Engn, Harbin 150001, Heilongjiang, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2018年 / 101卷
基金：
美国国家科学基金会;
关键词：
Laser spiral trepanning; Femtosecond laser; Film cooling hole; Energy disperse spectroscopy; ABLATION; METALS;
D O I：
10.1016/j.optlastec.2017.10.029
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Film cooling holes are crucial for improving the performance of the aviation engine. In the paper. the processing of the film cooling holes on K24 superalloy by femtosecond laser is investigated. By comparing the three different drilling methods, the spiral trepanning method is chosen, and all the drilling experiments are carried out in this way. The experimental results show that the drilling of femtosecond laser pulses has distinct merits against that of the traditional long pulse laser, which can realize the "cold" processing with less recasting layer and less crack The influence of each process parameter on roundness and taper, which are the important parameters to measure the quality of holes, is analyzed in detail, and the method to decrease it is proposed. To further reduce the recasting layer, the processing quality of the inner wall of the micro hole is investigated by scanning electron microscopy (SEM) equipped with energy disperse spectroscopy (EDS), the mechanism of the femtosecond laser interaction with K24 super alloy is further revealed. The investigation to the film hole machining by femtosecond laser has important practical significance. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：284 / 290
页数：7
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