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1. 沈阳工业大学 机械工程学院, 辽宁 沈阳 110870
2. 辽宁省激光表面工程技术重点实验室, 辽宁 沈阳 110870
Received:24 May 2022,
Online First:15 December 2023,
Published:30 October 2023
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Wei WANG, Jie SHEN, Weijun LIU, et al. Effect of Galvanometer Scanning Speed on Surface Quality and Friction Characteristics of 7075 Aluminum Alloy During Laser Cleaning[J]. Acta Armamentarii, 2023, 44(10): 2995-3005.
Wei WANG, Jie SHEN, Weijun LIU, et al. Effect of Galvanometer Scanning Speed on Surface Quality and Friction Characteristics of 7075 Aluminum Alloy During Laser Cleaning[J]. Acta Armamentarii, 2023, 44(10): 2995-3005. DOI: 10.12382/bgxb.2022.0437.
采用脉冲激光对7075铝合金表面原始氧化膜进行了激光清洗实验
探究振镜扫描速度对7075铝合金清洗表面形貌、氧含量和物相组成的影响规律
通过激光共聚焦显微镜和摩擦磨损试验机研究了7075铝合金的表面粗糙度和耐磨性能。研究结果表明:随着振镜扫描速度从2500mm/s 增加至4500mm/s
清洗表面氧含量和粗糙度均呈现先减小、后增大的趋势
当扫描速度为3500mm/s时
表面氧含量和粗糙度均达到最低
分别为1.45%和0.344μm
当扫描速度为2500mm/s时
清洗表面会出现严重的熔融现象
光斑凹坑以及波纹状凸起使得清洗表面粗糙度增大
当扫描速度小于等于3000mm/s时
清洗表面会发生热氧化
生成了主要由Al
2
O
3
组成的新的氧化膜;激光清洗后
粗糙度较小的熔融层可提高清洗表面减摩耐磨性;在10N的摩擦载荷下
严重熔融的清洗表面在摩擦过程中会发生疲劳剥落;清洗表面磨损机制主要以磨粒磨损和剥层磨损为主。
The laser cleaning experiment of the original oxide film on the surface of 7075 aluminum alloy was carried out by pulsed laser. The effects of galvanometer scanning speed on the surface morphology
oxygen content and phase composition of 7075 aluminum alloy were investigated. The surface roughness and wear resistance of 7075 aluminum alloy were studied by laser confocal microscope and friction and wear tester. The results show that
as the scanning speed of galvanometer increases from 2500mm/s to 4500mm/s
the oxygen content and roughness of the cleaned surface first decrease and then increase. When the scanning speed is 3500mm/s
the surface oxygen content and roughness reach the lowest
which are 1.45% and 0.344μm
resp
ectively. When the scanning speed is 2500mm/s
a serious melting phenomenon appears on the cleaned surface
and the spot pits and corrugated bulges make the cleaned surface roughness increase. When the scanning speed is less than or equal to 3000mm/s
a thermal oxidation occurs on the cleaned surface
and a new oxide film mainly composed of Al
2
O
3
is formed. After laser cleaning
the molten layer with small roughness can improve the antifriction and wear resistance of the cleaned surface. Under the friction load of 10N
a fatigue spalling occurs on the heavily molten cleaned surface during the friction process. The wear mechanism of cleaning surface is mainly abrasive and delamination wears.
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郑建新 , 刘威成 , 段玉涛 . 7075铝合金二维超声挤压加工表面质量影响因素及其交互作用研究 [J ] . 兵工学报 , 2017 , 38 ( 6 ): 1231 - 1238 . DOI: 10.3969/j.issn.1000-1093.2017.06.024 http://doi.org/10.3969/j.issn.1000-1093.2017.06.024 进行二维超声挤压加工正交试验,研究静压力、挤压速度和进给量等工艺参数及其交互作用对7075铝合金表面质量的影响,并寻求最优工艺参数。通过极差分析和方差分析,确定工艺参数及其交互作用对表面粗糙度和表层硬度的影响主次顺序和影响显著性;基于数据驱动,采用回归分析方法构建表面粗糙度和表层硬度预测模型;基于响应曲面法,分析交互作用对表面粗糙度和表层硬度的影响;利用有约束多目标规划模型,确定最优工艺参数。研究发现:经过二维超声挤压加工后,7075铝合金试件表面粗糙度值明显降低,而表层硬度大幅度提高;表面粗糙度主要取决于挤压速度和进给量的交互作用,而表层硬度主要取决于静压力、挤压速度,以及挤压速度和进给量、静压力和挤压速度的交互作用。基于预测模型获得的表面粗糙度和表层硬度与实测结果基本吻合;基于最小表面粗糙度值和最高表层硬度值目标下的最优工艺参数也与试验结果较为吻合。研究结果表明,工艺参数之间的交互作用对表面质量的影响是不可忽略的,所构建的表面粗糙度模型和表层硬度模型是有效的。
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沈浩 , 蔡杰 , 吕鹏 , 等 . 激光工艺参数对NiCoCrAlYSi熔覆层微观组织及性能的影响 [J ] . 兵工学报 , 2021 , 42 ( 7 ): 1524 - 1534 .
SHEN H , CAI J , LÜ P , et al . Effect of laser process parameters on microstructures and properties of NiCoCrAlYSi laser cladding coating [J ] . Acta Armamentarii , 2021 , 42 ( 7 ): 1524 - 1534 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2021.07.020 http://doi.org/10.3969/j.issn.1000-1093.2021.07.020 NiCoCrAlYSi coating was fabricated on Ni625 superalloy by laser cladding technique, and the influences of laser power and scanning speed on the metallurgical quality and microstructure of NiCoCrAlYSi cladding coating were researched. The relationship among the laser cladding process parameters, and the microstructures and properties of cladding coating was analyzed by testing its micro-hardness, and friction and wear properties. The results show that, with the increase in laser input energy from 36 J/mm<sup>2</sup> to 73.3 J/mm<sup>2</sup>, the thickness of cladding layer increases from 534 μm to 1 535 μm, the surface porosity increases from 0.07% to 0.65%, and the pore size increases from 0.23 μm to 1.33 μm. In addition, the grain size of cladding layer increases. The microhardness and wear resistance of the cladding layer decrease gradually with the increase in porosity and grain size. When the laser input energy ratio is 36 J/mm<sup>2</sup>, a cladding coating with high compactness, supper refined grains and high density of dislocations is obtained, which has optimal microhardness and wear resistance.
聂金浩 , 杨宜鑫 , 李玉新 , 等 . 激光能量密度对激光熔覆NiCoCrAlY涂层组织与性能的影响 [J ] . 兵工学报 , 2021 , 42 ( 5 ): 1083 - 1091 . DOI: 10.3969/j.issn.1000-1093.2021.05.021 http://doi.org/10.3969/j.issn.1000-1093.2021.05.021 为探究激光熔覆过程中能量密度对NiCoCrAlY涂层组织与性能的影响,在304不锈钢表面制备了NiCoCrAlY涂层。利用X射线衍射仪、扫描电子显微镜分析了NiCoCrAlY涂层的相组成和微观组织。通过显微维氏硬度计和往复摩擦磨损试验机研究了NiCoCrAlY涂层的硬度和耐磨性能。结果表明:NiCoCrAlY涂层气孔数量随激光能量密度增大而减少,熔深和熔高随激光能量密度增大而增大,当激光能量密度为3.8 kJ/cm<sup>2</sup>时涂层稀释率最低,同时气孔数量较少。NiCoCrAlY涂层中包含γ/γ′相和β相,微观结构以柱状晶为主,随着激光能量密度的增大,β相含量升高,柱状晶变大。不同激光能量密度下NiCoCrAlY涂层硬度均高于基体,当激光能量密度为3.8 kJ/cm<sup>2</sup>时 涂层硬度最高,为301 HV<sub>0.2</sub>. 在往复摩擦磨损实验中,当激光能量密度为3.8 kJ/cm<sup>2</sup>时 NiCoCrAlY涂层摩擦系数最小为0.46,磨损体积最少为0.235 9 mm<sup>3</sup>,磨损机理主要为磨粒磨损,耐磨性能最好。
NIE J H , YANG Y X , LI Y X , et al . Effect of laser energy density on microstructure and properties of laser cladding NiCoCrAlY coating [J ] . Acta Armamentarii , 2021 , 42 ( 5 ): 1083 - 1091 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2021.05.021 http://doi.org/10.3969/j.issn.1000-1093.2021.05.021 NiCoCrAlY coating was prepared on the surface of 304 stainless steel in order to study the effect of energy density on the microstructure and properties of NiCoCrAlY coating during laser cladding. The phase composition and microstructure of NiCoCrAlY coating were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM). The hardness and wear resistance of NiCoCrAlY coating were studied by using a micro Vickers hardness tester and reciprocating friction and wear testing machine. The results show that the number of pores in NiCoCrAlY coating decreases with the increase in laser energy density, and the penetration and melting height increase with the increase in laser energy density. When the laser energy density is 3.8 kJ/cm<sup>2</sup>, the coating dilution rate is the lowest, and the number of pores is less. The NiCoCrAlY coating contains γ/γ′ phase and β phase, and its microstructure is mainly columnar crystals. As the laser energy density increases, β phase content increases and the columnar crystals become larger. The hardness of NiCoCrAlY coating is higher than that of the substrate at different laser energy densities. The coating hardness is the highest when the laser energy density is 3.8 kJ/cm<sup>2</sup>, which is 301 HV<sub>0.2</sub>. In the reciprocating friction and wear experiment, when the laser energy density is 3.8 kJ/cm<sup>2</sup>, the friction coefficient is the smallest (0.46) and wear volume is the smallest (0.235 9 mm<sup>3</sup>), the wear mechanism is mainly abrasive wear, and the wear resistance is the best.
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