Relationship between Surface Roughness before and after UDR Treating

A series of samples which have different surface roughness made by 45 steel were treated by Ultrasonic Deep Rolling (UDR), influence of original surface roughness on UDR effects, such as surface profile, surface roughness and residual stress, were studied. Results shows that surface roughness was reduced substantially through UDR treating and lager the original surface roughness, larger surface roughness and surface residual stress induced by UDR treating.

Download Full-text

Analytical Modeling of Surface Roughness, Hardness and Residual Stress Induced by Deep Rolling

Journal of Materials Engineering and Performance ◽

10.1007/s11665-016-2486-5 ◽

2016 ◽

Vol 26 (2) ◽

pp. 876-884 ◽

Cited By ~ 2

Author(s):

Frederico C. Magalhães ◽

Alexandre M. Abrão ◽

Berend Denkena ◽

Bernd Breidenstein ◽

Tobias Mörke

Keyword(s):

Residual Stress ◽

Surface Roughness ◽

Analytical Modeling ◽

Deep Rolling

Download Full-text

Improvement of Fatigue Life of GH3039 Superalloy by Laser Shock Peening

Materials ◽

10.3390/ma13173849 ◽

2020 ◽

Vol 13 (17) ◽

pp. 3849

Author(s):

Yang Tang ◽

MaoZhong Ge ◽

Yongkang Zhang ◽

Taiming Wang ◽

Wen Zhou

Keyword(s):

Residual Stress ◽

Fatigue Life ◽

Surface Profile ◽

Optical Microscope ◽

Laser Shock Peening ◽

Laser Shock ◽

Transmission Electron ◽

Before And After ◽

Shock Peening ◽

Improve Fatigue

In order to improve fatigue life of GH3039 superalloy, GH3039 superalloy sheets were treated by laser shock peening (LSP). The microstructure of GH3039 superalloy before and after LSP was characterized using an optical microscope, transmission electron microscope (TEM), and X-ray diffractometer. The fatigue life of the samples with and without LSP was investigated by fatigue experiments. Moreover, surface profile and residual stress were also examined. Experimental results indicated that the grains in the surface layer of the LSP sample were remarkably refined and reached the nanometer scale. The average surface roughness increased from 0.024 μm to 0.19 μm after LSP. The average fatigue life of the laser treated samples was 2.01 times larger than that of the untreated specimens. Additionally, mathematical statistical analysis confirms that LSP has a significant influence on the fatigue life of GH3039 superalloy. The improvement of fatigue life for the laser processed GH3039 superalloy was mainly attributed to compressive residual stress and grain refinement generated by LSP.

Download Full-text

Residual Stress in SLM Ti6Al4V Alloy Specimens

Materials Science Forum ◽

10.4028/www.scientific.net/msf.828-829.305 ◽

2015 ◽

Vol 828-829 ◽

pp. 305-310 ◽

Cited By ~ 17

Author(s):

Ina Yadroitsava ◽

Stephen Grewar ◽

Daniel Hattingh ◽

Igor Yadroitsev

Keyword(s):

Residual Stress ◽

Laser Scanning ◽

Complex Geometry ◽

Ti6al4v Alloy ◽

Innovative Technology ◽

Full Density ◽

X Ray Diffraction ◽

Surface Residual Stress ◽

Principal Stresses ◽

Before And After

Selective Laser Melting (SLM) presents a modern manufacturing process with an innovative technology which allows the production of full-density objects or fine-structured parts with complex geometry and inner structures. Stability and certification of the properties of SLM parts are important tasks for all producers and end-users. One of the drawbacks of this technology is high residual stress in as-made SLM objects. In this study X-ray diffraction technique was used for investigating the residual stress induced into SLM Ti6Al4V alloy samples. Principal stresses were estimated for the cut rectangular specimen. Two types of the cantilevers were produced and numerical simulation of the stress was performed. The bending of cut cantilevers was measured before and after heat treatment. Next series of the samples had rectangular shapes and different thicknesses from 1 to 46 layers. All as-manufactured specimens attached to the substrate showed the presence of tensile residual stresses near the top surface. Residual stress along the laser scanning direction had magnitudes twice that of the stress in the perpendicular direction. Conclusions regarding directions and values of stresses in SLM objects from Ti6Al4V powder are given.

Download Full-text

Analysis of Surface Topography Characteristics in Electrochemical Mechanical Finishing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.126-128.658 ◽

2010 ◽

Vol 126-128 ◽

pp. 658-663 ◽

Cited By ~ 1

Author(s):

Ze Fei Wei ◽

Wen Ji Xu ◽

Gui Bing Pang ◽

Xu Yue Wang

Keyword(s):

Surface Topography ◽

Low Frequency ◽

Surface Profile ◽

Frequency Component ◽

Original Surface ◽

Auto Correlation ◽

Before And After ◽

Auto Correlation Function ◽

The Mean ◽

Quality Material

In this paper, surface topography characteristics of electrochemical mechanical finishing (ECMF) for steel was investigated. The scanning electron microscopy (SEM) was used to observe the surface topography. And the microcosmic geometry parameters were measured by Talysurf SLI2000. Compared with original surface, the surface topography characteristics of the workpiece machined by ECMF have been analyzed with altitude density function (ADF) and auto correlation function (ACF). The results show that there exist periodicity component in surface profile before and after finishing. The auto correlation curves of ECMF surface have a smaller average period compared with grinding surface. The low-frequency component and the mean ripple peak distance of original surface profile are obviously decreased. Furthermore, the ripples and peak density are increased, and the surface roughness Ra is decreased from 0.231μm to 0.023μm. The results indicate that surface quality, material ratio of the profile and wear resistance machined by ECMF are improved obviously.

Download Full-text

Investigation of Surface Topography at the End of Running-In Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.437.564 ◽

2013 ◽

Vol 437 ◽

pp. 564-567

Author(s):

Geng Pei Zhang ◽

Xiao Jun Liu ◽

Wen Long Lu ◽

Xiang Qian Jiang

Keyword(s):

Surface Roughness ◽

Surface Topography ◽

Surface Profile ◽

Wear Process ◽

Equilibrium Surface ◽

Important Stage ◽

Before And After ◽

3D Information

Running-in process is an important stage of whole wear process. The irrelevance of surface roughness before and after running-in puzzled the running-in research. However, this conclusion was based on surface roughness derived from the 2D surface profile which does not contain 3D information, and was therefore not complete. In this paper, running-in experiments were conducted to investigate the issue. The results showed that there is no equilibrium surface topography similar with equilibrium roughness at the end of running-in process.

Download Full-text

Analysis of Surface Morphology Characteristics in Mechanical Finishing and Electrochemical Mechanical Finishing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.2681 ◽

2010 ◽

Vol 44-47 ◽

pp. 2681-2685

Author(s):

Heng Zhou Zhen

Keyword(s):

Surface Morphology ◽

Low Frequency ◽

Surface Profile ◽

Frequency Component ◽

Original Surface ◽

Auto Correlation ◽

Before And After ◽

Auto Correlation Function ◽

Quality Material ◽

Morphology Characteristics

In this paper, surface morphology characteristics of mechanical finishing (MF) and electrochemical mechanical finishing (ECMF) for 45# steel was investigated. The microcosmic geometry parameters were measured by Surfcorder SE-3H. Compared with original surface, the surface morphology characteristics of the workpiece machined by MF and ECMF have been analyzed with auto correlation function (ACF). The results show that there exist periodicity component in surface profile before and after finishing. The auto correlation curves of ECMF surface have a smaller average period compared with MF surface. The low-frequency component and the mean ripple peak distance of original surface profile are obviously decreased. Furthermore, the ripples and peak density are increased, ECFM have a higher efficiency compared with MF, and the surface roughness Ra is decreased from 0.231μm to 0.032μm in 1 minute. The results indicate that surface quality, material ratio of the profile and wear resistance machined by ECMF are improved obviously.

Download Full-text

Effect of pedestrian traffic on the slip resistance and visual appearance of ceramic floor tiles

Research Society and Development ◽

10.33448/rsd-v10i4.14425 ◽

2021 ◽

Vol 10 (4) ◽

pp. e51610414425

Author(s):

Ana Virgínia Lot ◽

Ana Paula Margarido Menegazzo ◽

Camila Tavares Brasileiro ◽

Fábio Gomes Melchiades ◽

Anselmo Ortega Boschi

Keyword(s):

Surface Roughness ◽

Visual Analysis ◽

Surface Profile ◽

Visual Appearance ◽

Ceramic Floor ◽

Slip Resistance ◽

Floor Tiles ◽

Before And After ◽

Pedestrian Traffic ◽

Profile Characteristics

The increase of surface roughness is a common measure for improving the slip resistance of floors. Nevertheless, the surface roughness of the floors can wear out during the use. Furthermore, rough surfaces can be susceptible to dirt accumulation. As a consequence, during the use, the original slip resistance and visual appearance of the floors can be deteriorated. In this scenario, the objective of this work was to evaluate the effects of pedestrian traffic on the surface profile, slip resistance and visual appearance of commercial ceramic floor tiles. The surface profile (contact profilometer), slip resistance (pendulum method) and visual appearance (visual analysis) of different commercial ceramic floors were evaluated before and after their exposure to heavy pedestrian traffic, and the results were compared. Significant reductions of the sharpness and height of profile peaks of the surfaces, due to mechanical wear, were observed. Consequently, for all the surfaces which initially presented satisfactory slip resistance for use in slipping risk areas, this property was reduced to unsafe levels. The degree of dirt accumulation, and the consequent visual appearance deterioration, varied according to the profile characteristics of the studied floors. The best cleaning performances were found for surfaces with more spaced irregularities and wider profile valleys.

Download Full-text

Investigation of Surface Integrity in Conventional Grinding of Ti-6Al-4V

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.126-128.899 ◽

2010 ◽

Vol 126-128 ◽

pp. 899-904 ◽

Cited By ~ 5

Author(s):

Guo Giang Guo ◽

Zhi Qiang Liu ◽

Xiao Jiang Cai ◽

Qing Long An ◽

Ming Chen

Keyword(s):

Residual Stress ◽

Surface Roughness ◽

Surface Integrity ◽

Ground Surface ◽

Surface Residual Stress ◽

Machined Surface ◽

Conventional Grinding ◽

Metallurgical Structure ◽

Mechanical Factors ◽

Deformation Layer

This paper investigates the surface integrity of Ti-6Al-4V in conventional grinding using SiC abrasive, it includes surface roughness, surface topography, surface residual stress and metallurgical structure alteration. The experiment result indicated that grinding depth and feed rate have significant effect on surface roughness. Workpiece ground surface was free of crack, but severe plastic deformation layer and light burn appeared because of chemical reactions and mechanical factors. Ground surface was in a state of high tensile residual stress, thermal cycling of surface layer had the greatest effect. The machined surface experienced microstructure alteration on the top layer of ground surface, a heat-affected zone (HAZ) was observed.

Download Full-text

Study on Machinability of Hydrogenated Ti-6Al-4V Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1032.147 ◽

2021 ◽

Vol 1032 ◽

pp. 147-151

Author(s):

Zi Xuan Ding ◽

Jian Fei Sun ◽

Wei Dong Zhu

Keyword(s):

Residual Stress ◽

Titanium Alloy ◽

Cutting Force ◽

Surface Hardness ◽

Machining Process ◽

Surface Residual Stress ◽

Before And After ◽

Result Show

The milling experiments were conducted carried out which Ti-6Al-4V alloys with different amount of hydrogen permeating were processed, in order to explore various problem in the machining process of hydrogenated titanium alloy. The main cutting force, microhardness and residual stress before and after milling were measured. The experiments result show that Ti-6Al-4V alloy with appropriate amount of hydrogen can effectively reduce the cutting force, improve the surface hardness and reduce the surface residual stress.

Download Full-text