Surface morphology of laser tracks used for forming the non-smooth biomimetic unit of 3Cr2W8V steel under different processing parameters

2008 ◽  
Vol 254 (8) ◽  
pp. 2548-2555 ◽  
Author(s):  
Zhihui Zhang ◽  
Hong Zhou ◽  
Luquan Ren ◽  
Xin Tong ◽  
Hongyu Shan ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Processing Parameters ◽  
Biomimetic Unit

Experimental Study of the Surface of Steel 15Kh13MF after the Nanosecond Laser Shock Processing

2013 ◽  
Vol 200 ◽  
pp. 60-65 ◽  
Author(s):  
Pavlo Maruschak ◽  
Islam Zakiev ◽  
Vitaly Mocharsky ◽  
Yuriy Nikiforov
Keyword(s):  
Experimental Study ◽  
Surface Morphology ◽  
Laser Irradiation ◽  
Laser Treatment ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing

The influence of processing parameters on the morphology of periodical structures on surface of steel 15Kh13MF after the nanosecond laser irradiation are discussed and analyzed. Modification of microstructure, surface morphology, and hardness by laser treatment is discussed

Insights into fabrication mechanism of pure copper thin wall components by selective infrared laser melting

2019 ◽  
Vol 25 (8) ◽  
pp. 1388-1397
Author(s):  
Jieren Guan ◽  
Xiaowei Zhang ◽  
Yehua Jiang ◽  
Yongnian Yan
Keyword(s):  
Surface Morphology ◽  
Pure Copper ◽  
Processing Parameters ◽  
Thin Wall ◽  
Single Track ◽  
Heat Accumulation ◽  
Laser Melting ◽  
Minimum Thickness ◽  
Content Type ◽  
Wall Components

Purpose This study aims to obtain the mechanistic insights for the fabrication of pure copper thin wall components by selective infrared (IR) laser melting (SLM) and correlated with microstructure development, microhardness, surface morphology and phase analysis. Experimental processes for single track and selection of substrate materials have been studied using a combination of different laser powers and scanning speeds. Design/methodology/approach SLM of pure copper was performed on a YONGNIAN Laser YLMS-120 SLM machine using an Nd: YAG fiber laser operating at 1,060 nm in the NIR region. Single-track experiments and processing parameters are investigated through different combinations of laser power and scanning speed. The microstructure of the fabricated pure copper samples by SLM technique was analyzed by means of X-ray diffraction, scanning electron microscope equipped with energy disperse spectrometer, optical microscope (OM) and micro-hardness tester. Findings Steel-based substrates were found suitable for pure copper manufacturing due to sufficient heat accumulation. The width of a single track was determined by liner energy density, showing discontinuities and irregular morphologies at low laser powers and high scanning speeds. As a result of instability of the molten pool induced by Marangoni convection, cracks and cavities were observed to appear along grain boundaries in the microstructure. The top surface morphology of SLM-processed component showed a streamflow structure and irregular shapes. However, the powder particles attached to side surface, which manifest copper powders, are even more sensitive to melt pool of contour track. The crystal phase characteristics of copper components indicated increasing crystallite size of a-Cu, and the decreasing intensity of diffraction peak was attributed to the presence of defects during SLM. The maximum relative density and microhardness were 82 per cent and 61.48 HV0.2, respectively. The minimum thickness of a pure copper thin wall component was 0.2 mm. Originality/value This paper demonstrated the forming mechanism and explored feasibility of pure copper thin wall parts by SLM technology in the NIR region. The surface morphology, microstructure and crystal structure were preliminary studied with laser processing parameters.

Three-dimensional topography simulation research of diamond-wire sawing based on MATLAB

2019 ◽  
Vol 72 (3) ◽  
pp. 325-331
Author(s):  
Ligang Zhao ◽  
Guofeng Xia ◽  
Yuhu Shi ◽  
Aisheng Wu
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Three Dimensional ◽  
Processing Parameters ◽  
Feed Speed ◽  
Machining Parameters ◽  
Content Type ◽  
Diamond Wire ◽  
Wire Saw ◽  
Diamond Wire Sawing

Purpose The purpose of this paper is to study the influence of the processing parameters of diamond wire sawing on surface morphology and roughness. Design/methodology/approach First, a wire saw cutting model is established to determine the positional relationship between a wire saw and the machined surface of the workpiece, and the abrasive grain cutting trajectory is generated. Through the data processing of the cutting trajectory, the simulation of the three-dimensional surface topography of the slice and the calculation of the surface roughness are realized by using the GUI programming of MATLAB. Finally, different surface roughness values are obtained by changing the machining parameters (saw wire speed and workpiece feed speed). Findings The conclusion is that the surface roughness of the slice is larger when the feed speed is higher and smaller when the linear speed is higher. Originality/value Diamond wire saw cutting is the first process of chip processing, and its efficiency and quality have an important impact on subsequent processing. This paper will focus on the influence of the sawing wire cutting processing parameters (sawing wire speed and workpiece feed speed) on the surface roughness to optimize the processing parameters and obtain smaller surface roughness values. Through MATLAB three-dimensional simulation, the surface morphology can be observed more intuitively, which provides a theoretical basis for improving the processing quality.

Preparation and Characterization of Copper-Coated Alumina Powders

2007 ◽  
Vol 336-338 ◽  
pp. 1403-1405
Author(s):  
G. Zhao ◽  
Z.M. Shi
Keyword(s):  
Phase Composition ◽  
Surface Morphology ◽  
Room Temperature ◽  
Processing Parameters ◽  
Experimental Results ◽  
High Quality ◽  
Chemical Plating ◽  
Plating Method ◽  
Plating Solution

Copper-coated alumina powders were prepared by a chemical plating method. The processing parameters such as compositions of plating solution, dispersants and passivants were optimized to obtain high-quality Cu-coated alumina powders. The phase composition, surface morphology and granularity of the coated powders were analyzed. Experimental results showed that the alumina powders coated with copper can be successfully prepared by the chemical plating method at room temperature, and the additions of dispersant and passivant can sufficiently improve the dispersity of powders and can depress the oxidation of copper layers precipitated from the plating solution. The granularity of alumina powders is increased by about 60 nm after being coated with the copper layer.

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