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Experimental Analysis of Microscale Laser Shock Processing on Metallic Material Using Excimer Laser

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Journal of Materials Science & Technology 2009年第6期25卷 829-834页

作者： zhigang che Liangcai Xiong Tielin Shi Huayang cheng Likun Yang Wuhan National Laboratory for Optoelectronics State Key Lab of Digital Manufacturing Equipment & Technology School of Mechanical Science and Engineering Huazhong University of Science & Technology Wuhan 430074 China Wuhan Huagong Laser Engineering Co. Ltd Wuhan 430223 China

Microscale laser shock processing （μLSP）, also known as laser shock processing in microscale, is a technique that uses microscale focused laser beam to induce high pressure plasma and generates plastic deformation and compressive residual stress in target materials, thus improves fatigue or stress corrosion cracking resistance of MEMS （Micro Electromechanical Systems） devices made of such a material. Many works have been reported about the research and experiment for μLSP. But the diameters of 50-200 μm were used at the first time for this field, which was useful for treating micro-device components with larger area and curved surface. The excimer laser was used firstly on μLSP for shorter wavelength than that of used in previous researches. The determination method of laser spot size at micro-level spatial resolution was presented. Under these conditions, plastic deformation, the stress analysis and microhardness with different pulse number, pulse energy and pulse spacing were investigated. Especially the residual stress distribution with depth treated by #LSP, was first investigated. Experiment results showed that the material performance was improved remarkably after μLSP.

关键词： μLSP Plastic deformation Residual stress Micro-hardness Laser spot size

三维打印技术辅助设计股前外侧穿支皮瓣修复四肢不规则创面

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中华整形外科杂志 2024年第9期40卷 946-953页

作者：葛成伟蒋国栋王凯车志刚程俊楠滕志成袁松巨积辉苏州瑞华骨科医院手外科苏州215104

目的探讨三维打印术前精准设计皮瓣三维模型在股前外侧穿支皮瓣修复四肢不规则创面中的临床效果。方法回顾性分析2022年1至10月苏州瑞华骨科医院应用三维打印技术术前精准设计股前外侧穿支皮瓣修复四肢不规则软组织缺损的患者资料。术... 详细信息

目的探讨三维打印术前精准设计皮瓣三维模型在股前外侧穿支皮瓣修复四肢不规则创面中的临床效果。方法回顾性分析2022年1至10月苏州瑞华骨科医院应用三维打印技术术前精准设计股前外侧穿支皮瓣修复四肢不规则软组织缺损的患者资料。术前使用三维扫描仪对创面进行扫描后, 打印出创面模型, 结合术前彩色多普勒超声定位的股前外侧区域穿支体表位置, 精准设计与切取皮瓣, 修复创面。术后观察随访皮瓣成活、供受区愈合、并发症发生等情况, 并采用皮瓣综合评价量表评价创面修复效果, 总分为100分, 分为优(90~100分)、良(75~89分)、可(60~74分)、差(<60分)。结果共纳入34例患者, 男26例, 女8例, 年龄18~75岁, 平均45.5岁。致伤部位:手腕部17例, 足部10例, 踝部7例。手术时间2.0~4.5 h, 平均3.3 h, 所有皮瓣供区均直接缝合。2例皮瓣移植术后出现血管危象, 经手术探查解除血管危象后, 移植皮瓣成活, 其余皮瓣均顺利成活。34例患者均获6~10个月随访, 平均8个月。所有皮瓣供区均一期愈合, 受区创面愈合时间为10~44 d, 平均20 d。末次随访时, 皮瓣色泽、质地良好, 感觉恢复至S1、S2级;供区有瘢痕遗留, 未出现瘢痕挛缩及疼痛等不适, 无其他严重并发症发生。皮瓣综合评价量表评分为80~91分, 平均86分, 其中优25例、良6例、可3例, 优良率为91%(31/34)。结论应用三维打印技术辅助设计股前外侧穿支皮瓣修复四肢不规则创面, 可显著减少术中皮瓣设计时间, 符合精准化设计、切取皮瓣的理念, 临床效果良好, 能有效减少供区创伤及并发症。

关键词：创伤和损伤四肢三维打印显微外科技术股前外侧皮瓣穿支皮瓣创面模型

Preparation of Al-based amorphous coatings and their properties

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Journal of Rare Earths 2021年第3期39卷 340-347,I0004页

作者： Lei Jin Le Zhang Kaige Liu zhigang che Kai Li Ming Zhang Bo Zhang Science and Technology on Power Beam Process Laboratory AVIC Manufacturing Technology InstituteBeijing 100024China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China Aeronautical Key Laboratory of Advanced Surface Engineering Technology AVIC Manufacturing Technology InstituteBeijing 100024China

Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) amorphous coatings were prepared using cold gas kinetic spray *** results show that Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) amorphous coatings are achieved with the porosity about 3.2%,thickness about 893 μm,the amount of amorphous phase about 82.5%,the hardness about 300 *** corrosion potential and anti-corrosion life of 7075 T6 alloy aluminum are about-0.78 V and 72 h,*** electrochemical analysis and neutral salt spray are about-0.69 V corrosion potential and 274 h anti-corrosion life for amorphous Al-based coatings,***,the life of the Albased amorphous coatings is about 3.8 times that of 7075 T6 aluminum ***,the failure mechanism was analyzed using TEM in this *** a word,Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) coatings keep dense structure,high amorphous content,favorable amorphous phase stabilizing ability and longer anticorrosion *** is,Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) coatings have better comprehensive ***,these findings indicate that the present Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) amorphous coatings prepared using cold gas kinetic spray technique can protect aluminum alloy very well and they can be considered to be used in aviation field.

关键词： Al-based amorphous material Coatings Cold spray Properties Rare earths

Study of the location of testing area in residual stress measurement by Moiré interferometry combined with hole-drilling method

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Science China(Physics,Mechanics & Astronomy) 2014年第4期57卷 708-715页

作者： QIN Le XIE HuiMin ZHU RongHua WU Dan che zhigang ZOU ShiKun Key Laboratory of Applied Mechanics (AML) Department of Engineering Mechanics Tsinghua University Beijing Aeronautical Manufacturing Technology Research Institute

This paper investigates the effect of the location of testing area in residual stress measurement by Moiréinterferometry combined with hole-drilling *** selection of the location of the testing area is analyzed from theory and *** the theoretical study,the factors which affect the surface released radial strainεr were analyzed on the basis of the formulae of the hole-drilling method,and the relations between those factors andεr were *** combining Moiréinterferometry with the hole-drilling method,the residual stress of interference-fit specimen was measured to verify the theoretical *** to the analysis results,the testing area for minimizing the error of strain measurement is ***,if the orientation of the maximum principal stress is known,the value of strain will be measured with higher precision by the Moiréinterferometry method.

关键词： hole-drilling residual stress Moiré interferometry testing area

A micro-scale strain rosette for residual stress measurement by SEM Moiré method

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Science China(Physics,Mechanics & Astronomy) 2014年第4期57卷 716-722页

作者： ZHU RongHua XIE HuiMin ZHU JianGuo LI YanJie che zhigang ZOU ShiKun Key Laboratory of Applied Mechanics (AML) Department of Engineering Mechanics Tsinghua University School of Civil Engineering and Architecture University of Jinan Beijing Aeronautical Manufacturing Technology Research Institute

In this paper,a new method combining focused ion beam(FIB)and scanning electron microscope(SEM)Moirétechnique for the measurement of residual stress at micro scale is *** FIB is employed to introduce stress relief like the macro ring-core method and fabricate gratings with a frequency of 5000 lines/mm on the measured area of the sample *** groups of gratings in different radial directions are manufactured in order to form a micro-scale strain *** milling ring-core by FIB,the deformation incurred by relief of the stress will be recorded with the strain *** displacement/strain field can be measured using SEM scanning Moiréwith random phase-shifting *** this study,the Nickel alloy GH4169 sample(which was processed by laser shock peening)is selected as a study object to determine its residual *** results showed that the components of the in-plane principal stresses were-359 MPa and-207 MPa,respectively,which show good agreement with the results obtained from the available literature.

关键词： residual stress focused ion beam SEM Moiré method ring-core method random phase-shifting

以旋股外侧动脉斜支为蒂并携带阔筋膜的股前外侧穿支皮瓣修复手足毁损性创面并重建功能的效果

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中华烧伤与创面修复杂志 2024年第9期40卷 842-848页

作者：葛成伟蒋国栋程俊楠郭礼平车志刚袁松巨积辉苏州瑞华骨科医院手外科苏州215104

目的探讨采用以旋股外侧动脉斜支为蒂并携带阔筋膜的股前外侧穿支皮瓣修复手足毁损性创面并重建功能的效果。方法该研究为回顾性观察性研究。2022年1月—2023年3月,苏州瑞华骨科医院收治16例符合入选标准的合并伸肌腱缺损的手足毁损性... 详细信息

目的探讨采用以旋股外侧动脉斜支为蒂并携带阔筋膜的股前外侧穿支皮瓣修复手足毁损性创面并重建功能的效果。方法该研究为回顾性观察性研究。2022年1月—2023年3月,苏州瑞华骨科医院收治16例符合入选标准的合并伸肌腱缺损的手足毁损性创面患者,其中男12例、女4例,年龄3~63岁。创面位于手部者12例、足部者4例。伸肌腱缺损根数为1~5根,缺损长度为2.5~6.0 cm。清创后创面面积为11.0 cm×5.5 cm~29.0 cm×9.5 cm,采用以旋股外侧动脉斜支为蒂并携带阔筋膜的股前外侧穿支皮瓣修复,皮瓣面积为12.0 cm×6.5 cm~30.0 cm×11.0 cm;用阔筋膜修复缺损伸肌腱,阔筋膜切取面积为8.0 cm×3.0 cm~12.0 cm×8.0 cm。将15例患者皮瓣供区创面直接缝合,1例患者皮瓣供区创面采用下腹部中厚皮片覆盖。术后1周内,观察皮瓣成活情况及皮瓣供受区创面愈合情况。术后随访,统计行修薄整形术或肌腱松解术的患者数。末次随访时,评定手部及足部移植皮瓣感觉功能恢复情况,采用皮瓣综合评价量表评定皮瓣修复疗效,依据中华医学会手外科学分会上肢部分功能评定试用标准评定手部功能。比较术前及末次随访时测量的伤指总主动活动度及采用Maryland足部功能评分标准评定的足部功能。结果2例患者术后出现皮瓣动脉危象,经及时探查后皮瓣成活,其余患者术后皮瓣存活良好;供受区术后未见明显瘢痕增生或破溃。所有患者获得随访8~16个月,其中6例患者于术后6~7个月行皮瓣修薄整形术,4例患者于术后3~6个月行肌腱松解术。末次随访时,皮瓣感觉功能恢复达S1级者5例、S2级者11例,两点辨别觉仅有1个点;皮瓣修复疗效评分为80~91分,评定为优者5例、良者9例、可者2例;手部功能评定为优者5例、良者5例、可者2例。所有患者均成功重建伤指/趾主动伸直功能,末次随访时的伤指总主动活动度为(225±22)°,明显高于术前的(117±20)°(t=119.59,P<0.05);末次随访时的足部功能评分为(86±7)分,明显高于术前的(29±7)分(t=222.68,P<0.05),足部功能评定为优者2例、良者1例、可者1例。结论以旋股外侧动脉斜支为蒂的股前外侧穿支皮瓣切取操作相对简单,修复手足创面后外观和功能良好,皮瓣供受区均无明显瘢痕增生。皮瓣携带的阔筋膜可同期修复伸肌腱缺损,改善指/趾体活动。

关键词：外科皮瓣阔筋膜手足斜支股前外侧穿支皮瓣毁损性创面创面修复

Surface Profiles and Residual Stresses on Laser Shocked Zone of Ti6Al4V Titanium Alloy

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稀有金属材料与工程 2011年第S4期40卷 190-193页

作者： Cao Ziwen,Gong Shuili,Zou Shikun,che zhigang National Key Laboratory of High Energy Density Beam Processing Technology,Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China Beijing Aeronaut Mfg Technol Res Inst Natl Key Lab High Energy Dens Beam Proc Technol Beijing 100024 Peoples R China

The latest applications of laser shock processing were summarized in this paper,and laser peening with water confined layer has been applied to Ti6Al4V titanium alloy using Nd:glass pulse *** profile of plastic deformation and residual stresses on metal surface were studied with different laser power *** investigation results show that peak depth of plastic deformation is in linear proportion to laser power density (5.75GW/cm2 to 9.5 GW/cm2),and maximal surface compressive residual stress is up to 375MPa at 8.25GW/*** was ensured that the compressive residual stress field related to laser power density and shocked *** spot overlapping ratio of 33%,the circle spot can get a relative smooth *** strip with thickness 2.5mm was shocked as the preliminary verification test of residual stresses,and it is shown that excessive peening times is unavailable to thin-wall parts just as edge of fan blades.

关键词： laser shock processing Ti6Al4V surface profiles residual stresses

Precision design of Ti sites for unprecedented catalytic performance

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National Science Review 2024年第7期11卷 67-68页

作者： Haoquan Zheng Shunai che Key Laboratory of Applied Surface and Colloid chemistry Ministry of Education School of Chemistry and Chemical Engineering Shaanxi Normal University School of chemistry and chemical Engineering Shanghai Jiao Tong University

In 1983, Taramasso et al. incorporated titanium(Ti) into porous silica frameworks to endow Ti sites with catalytic oxidation ability [1]. Nowadays, catalytic oxidation reactions using titanium silicate materials have ...

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高能激光喷丸TC21钛合金试验研究(英文)

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稀有金属材料与工程 2014年第12期43卷 2962-2965页

作者：车志刚杨杰唐楠巩水利北京航空制造工程研究所高能束流加工技术重点实验室北京100024 华北水利水电大学河南郑州450045 中国人民大学附属中学朝阳学校北京100028

激光喷丸,又称为激光冲击强化(LSP),是一种新型表面处理技术,通过在材料表面诱导强烈塑性变形、产生高密度位错,产生较深的残余压应力,来提高材料的表面性能。采用LSP技术应用高能激光处理TC21钛合金。对材料的显微硬度、表面轮廓、冲... 详细信息

激光喷丸,又称为激光冲击强化(LSP),是一种新型表面处理技术,通过在材料表面诱导强烈塑性变形、产生高密度位错,产生较深的残余压应力,来提高材料的表面性能。采用LSP技术应用高能激光处理TC21钛合金。对材料的显微硬度、表面轮廓、冲击区表面粗糙度、残余应力进行了试验研究。结果表明:处理后,材料的显微硬度得到较大提高,冲击表面轮廓与冲击光斑大小直接相关,冲击区表面粗糙度(R a)不超过0.8μm,处理后,材料表面残余压应力水平得到了大幅度提高。经过LSP处理后,改善了材料的综合性能。

关键词：激光喷丸 TC21钛合金残余应力显微硬度表面轮廓