Sixteenth National Conference on Laser Technology and Optoelectronics最新文献_第9页

Effect of laser shock peening and heat‑treated on surface hardness of Ti–6Al–4V 激光冲击强化和热处理对Ti-6Al-4V表面硬度的影响

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603187

Liming Yuan, Wentai Ouyang, X. Qin, Wenwu Zhang, Pengkai Liu, Hongyu Quan, Tianrun Zhang

{"title":"Effect of laser shock peening and heat‑treated on surface hardness of Ti–6Al–4V","authors":"Liming Yuan, Wentai Ouyang, X. Qin, Wenwu Zhang, Pengkai Liu, Hongyu Quan, Tianrun Zhang","doi":"10.1117/12.2603187","DOIUrl":"https://doi.org/10.1117/12.2603187","url":null,"abstract":"Ti-6Al-4V (TC4) titanium alloys have been extensively used in aviation due to their good comprehensive mechanical properties. However, TC4 has low hardness and poor wear resistance, which cannot meet the increasingly stringent working environment requirements of aerospace. Thus, it is necessary to enhance their performance by posttreatment. Laser shock peening (LSP) is an advanced surface treatment technology that improve the hardness and fatigue life of the metal material by ultra-high plastic strain. However, laser shock peening has limits to improve the surface hardness of workpiece. And heat treatment can effectively improve the performance of titanium alloys. Therefore, the combination of heat treatment and laser shock peening is used to improve the surface hardness of TC4. In this study, the Ti-6Al-4V (TC4) samples were subjected to one and two LSP impacts, respectively. Heat treatment was performed on the sample that has been subjected to one impact, and one of the heat-treated samples was subjected to one impact again. The surface hardness was measured by a Vickers hardness tester meter. The fracture morphologies were observed by scanning electron microscope (SEM) and phase characterization was measured by X-ray diffractometer (XRD). The effect of laser shock peening and heat treatment on the surface hardness of TC4 samples was experimentally investigated. The results showed that the maximum surface hardness of the treated sample was increased by 56.8% compared with original sample. Therefore, the combination of laser shock peening and heat treatment can greatly increase the surface hardness of the TC4.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116793314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research and simulation analysis of laser ranging technology based on pulse compression 基于脉冲压缩的激光测距技术研究与仿真分析

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603168

Du Juan, Zhu Jingguo, Jiang Chenghao, Qiao Zhi, H. Zhihong, Cao Kang, Wang Chunxiao, Zuo Yong

引用次数: 0

Analysis of propagation characteristics of Gaussian beam in weakly compressible flow 高斯光束在弱可压缩流中的传播特性分析

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2601813

Jinyu Xie, L. Bai, Yankun Wang

引用次数: 0

Research on multi-point light focusing based on complex neural network 基于复杂神经网络的多点光聚焦研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603136

C. Xiang, Zhaoyang Ttang, Yuanshen Xiao, Yingchun Ding, Jiaqi He

引用次数: 0

Imbert-Fedorov shifts in anisotropic two-dimensional atomic crystals 各向异性二维原子晶体中的Imbert-Fedorov位移

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603132

Xiaoyan Yu, Jin Zhang, Yuqing Chen, Mian Huang, X. Dai

引用次数: 0

Research on 3D high speed precision machining of sapphire based on femtosecond laser 基于飞秒激光的蓝宝石三维高速精密加工研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602942

Zhihao Chen, Hongbing Yuan, Peichao Wu, Ling Zhao, Mina Zhang, Xiaowen Cao, Wenwu Zhang

{"title":"Research on 3D high speed precision machining of sapphire based on femtosecond laser","authors":"Zhihao Chen, Hongbing Yuan, Peichao Wu, Ling Zhao, Mina Zhang, Xiaowen Cao, Wenwu Zhang","doi":"10.1117/12.2602942","DOIUrl":"https://doi.org/10.1117/12.2602942","url":null,"abstract":"Sapphire is widely used in industry, national defense, aerospace, space technology and other fields due to its excellent physical and chemical properties such as ultra-high hardness, good thermal and chemical stability, high transmittance and so on. Because of the brittleness of sapphire, edge collapse and fragmentation are occurring easily during the process of traditional mechanical machining. Therefore, development of a rapid and high-quality processing method has great significance. Compared with continuous / long pulse laser processing, femtosecond laser processing with ultra-short duration and extremely high peak power has the advantages of small thermal effect, high processing accuracy, real three-dimensional and wide material adaptability. In this paper, a method of machining sapphire with a center wavelength of 515 nm femtosecond laser and scanning galvanometer is proposed. The effects of laser power, processing speed and scanning pitch on the machining depth and surface roughness are studied. A 3D structure is fabricated by combining a scanning galvanometer and the XYZ platform with high speed. Finally, two types of arrays of 3D structure have been fabricated on sapphire, which has high machined surface quality.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"311 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114714334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The influence of sample porosity on refractive index in THz non-destructive testing 太赫兹无损检测中试样孔隙率对折射率的影响

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602928

Ying Li, Zhaohui Zhang, Xiaoyan Zhao, Tian-yao Zhang

引用次数: 0

Changes in surface characteristics of stainless steel polished by nanosecond laser based on beam coupling 基于光束耦合的纳秒激光抛光不锈钢表面特性的变化

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603292

Xiaoxiao Chen, Yuan Li, Huihui Zhang, Wenwu Zhang

{"title":"Changes in surface characteristics of stainless steel polished by nanosecond laser based on beam coupling","authors":"Xiaoxiao Chen, Yuan Li, Huihui Zhang, Wenwu Zhang","doi":"10.1117/12.2603292","DOIUrl":"https://doi.org/10.1117/12.2603292","url":null,"abstract":"The laser polishing process of metal materials has been extensively studied. This paper proposes a new type of beam-coupled laser polishing method to study the surface quality of polished stainless steel when the power and frequency change, and the changes of the surface roughness and topography with the laser power and frequency were analyzed. Under the condition of power 0.5W and frequency 10Khz, as the feed speed changes from 200mm/min to 1200mm/min, the surface roughness first decreases, then slightly increases. The single pulse energy decreases, and the surface roughness first increases and then decreases with increasing of the frequency from 10kHz to 20kHz. With low repetition frequency and single pulse energy, the surface roughness is significantly reduced to 0.19μm at the process parameters of 2.0W, 10Khz, and 600mm/min. Under the specific process parameters, the processed surface has a color change similar to that caused by surface quenching treatment. The surface material absorbs more laser light, and the processed surface microstructure changes. By adjusting the process parameters, the polishing quality can be improved. It is proved that the beam-coupled laser polishing of stainless steel is an effective polishing method.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134538252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Measurement of distributed refractive index through Rayleigh backscattering spectra detection using a U-bent common fiber 利用u型弯曲普通光纤瑞利后向散射光谱检测测量分布折射率

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2600768

Qiao Shan, Liwen Sheng, Ping Song, Zhang Aiguo, Guo Honglong, Li Peng, Jinpeng Lang, Jin Hui, Qu Tianyang

引用次数: 1

Effect of laser remelting on microstructure and mechanical property of AlCoCuFeNi high entropy alloy fabricated by laser additive manufacturing 激光重熔对激光增材制造AlCoCuFeNi高熵合金组织和力学性能的影响

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603159

ye xuyang, Z. Mina, He Longjun, xu zifa, R. Dianbo, Zhang Wenwu

引用次数: 0