Role of laser cleaning on surface preparation of metallic materials

2004 ◽  
Author(s):  
Roland Oltra ◽  
Michel L. Autric
Keyword(s):  
Surface Preparation ◽  
Laser Cleaning ◽  
Metallic Materials

Determining the Origin and Age of Metal Artifacts

MRS Bulletin ◽  
1989 ◽  
Vol 14 (3) ◽  
pp. 31-35 ◽  
Author(s):  
Michael L. Wayman
Keyword(s):  
Optical Microscopy ◽  
Elemental Analysis ◽  
Raw Materials ◽  
Surface Preparation ◽  
Analytical Techniques ◽  
Metallic Materials ◽  
Valuable Contribution ◽  
Metal Artifacts ◽  
Elemental Analyses

Metallography is undoubtedly one of the most useful techniques for addressing the numerous questions posed by archaeologists about metal artifacts. The most frequent questions include:∎ What is the nature of the metal or alloy which the object is made of?∎ Where did the object and/or its raw materials originate?∎ What technologies were employed in producing the object?∎ How old is it?Many aspects of a metal artifact's history are imprinted in its microstructure (i.e., the structure of the material as revealed under the microscope after appropriate surface preparation). The artifact has a story to tell and the role of the archaeometallurgist is to read and translate the story by studying and interpreting the microstructure. In most cases it is productive to supplement the information obtained from optical microscopy by using other analytical techniques. This will be illustrated below.Although it is frequently not possible to obtain definitive answers to the above questions, this does not necessarily mean that the analysis has served no useful purpose. For example, it may be just as important to demonstrate what an artifact is not as to prove what it is. Eliminating some of the possible identifications may be a valuable contribution.Consider the first question: What material is the artifact made of? It is normally essential to perform elemental analyses in order to identify the material. Nevertheless, metallography is a useful first step in answering this particular question. Furthermore, the specimen prepared for optical microscopy can be used without further preparation for other analytical techniques (such as electron probe microanalysis) which can yield an elemental analysis. As will be demonstrated in the following case studies, metallography is of great value in assessing the forms of impurities in metallic materials. This is highly useful information which elemental analysis cannot provide.

scholarly journals Laser cleaning of oxidized metallic materials: role of the optical properties of the oxide films

2001 ◽  
Author(s):  
Pierre Pasquet ◽  
Pandora Psyllaki ◽  
Roland Oltra ◽  
Jean-Pierre Boquillon ◽  
Paul Leiderer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Oxide Films ◽  
Laser Cleaning ◽  
Metallic Materials

Role of mesostructure in thermomechanical treatment of metallic materials

2007 ◽  
Vol 49 (1-2) ◽  
pp. 24-28 ◽  
Author(s):  
G. E. Kodjaspirov ◽  
V. V. Rybin ◽  
H. Apostolopoulos
Keyword(s):  
Thermomechanical Treatment ◽  
Metallic Materials

Thickness-Dependent Tensile Behavior of Cu-Mn Alloys under Different Dislocation Slip Modes

2019 ◽  
Vol 294 ◽  
pp. 104-110 ◽  
Author(s):  
Le Le Kang ◽  
Dong Han ◽  
Xiao Wu Li
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Size Effect ◽  
Uniform Elongation ◽  
Tensile Behavior ◽  
Dislocation Slip ◽  
Slip Mode ◽  
Planar Slip ◽  
Metallic Materials

To explore the role of dislocation slip mode playing in the size effect of mechanical behavior of metallic materials, the tensile behavior of Cu-5at.%Mn and Cu-20at.%Mn alloys with thickness (t) spanning from 0.1 to 2.0 mm is investigated. The results reveal that the yield strength σYS of Cu-5at.%Mn alloy displays an independence of thickness, whereas the ultimate tensile strength σUTS and the uniform elongation δ show an obvious size effect. The σUTS and δ first slightly decrease as t is reduced from 2.0 to 0.5 mm, but evidently drop when t is below 0.5 mm. A similar size effect is also exhibited in Cu-20at.%Mn alloy; however, the variation trend of “the smaller the weaker” in size effect can be weakened by the planar slip of dislocations occurring during the deformation of this alloy.

Surface preparation by using laser cleaning in thermal spray

2008 ◽  
Vol 20 (1) ◽  
pp. 12-21 ◽  
Author(s):  
H. Li ◽  
S. Costil ◽  
H-L. Liao ◽  
C. Coddet ◽  
V. Barnier ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Surface Preparation ◽  
Laser Cleaning

Epitaxial Iridium Growth on Strontium Titanate

2000 ◽  
Vol 648 ◽  
Author(s):  
Z. Dai ◽  
A.P. Li ◽  
C. Bednarski ◽  
L. I. McCann ◽  
B. Golding
Keyword(s):  
Surface Roughness ◽  
Substrate Surface ◽  
Surface Preparation ◽  
Electron Beam Evaporation ◽  
Layer By Layer ◽  
Epitaxial Relationship ◽  
Ion Channeling ◽  
Substrate Temperatures ◽  
Subsequent Layer

AbstractEpitaxial (100) iridium films have been grown on (100) SrTiO3 (STO) substrates by electron beam evaporation. The epitaxial relationship between the iridium film and STO substrate was determined to be Ir(001)[100]//STO(001)[100]. A systematic study of the role of STO substrate surface preparation, Ir thickness, and substrate temperature on Ir film crystallinity and morpholo- gy has been performed. The best Ir films typically have small Ir(200) XRD linewidths < 0.3 °, surface roughness of 0.2 nm, and low ion channeling yields, χmin≤ 4%, when deposited at 800 °C. Films generally become smoother with better crystallinity when the film thickness approaches 300 nm. A growth mode with initial island formation and subsequent layer-by-layer appears to take place at higher substrate temperatures, whereas at lower temperatures the film grows in a 3D mode.

APPLICABILITY OF A NEW SURFACE PREPARATION METHOD FOR STEEL STRUCTURE USING LASER

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Hiroshi Ogami ◽  
Katashi Fujii ◽  
Yukio Manabe ◽  
Kohei Ota ◽  
Asuo Yonekura
Keyword(s):  
Preparation Method ◽  
Surface Condition ◽  
Surface Preparation ◽  
Steel Structure ◽  
Steel Structures ◽  
Laser Cleaning ◽  
Coating Film ◽  
Test Results ◽  
Corrosion Prevention ◽  
Accelerated Corrosion

Surface preparation is very important in re-painting of steel structures so as to extend the effective term of corrosion prevention. Though grinding or blasting have been widely used to remove rust and old coating film on steel surface, both these methods have difficulty in completion of rust-removal and cause some problems such as dust scattering, noise, etc. In order to solve these problems, this paper presents the laser cleaning method which instantaneously sublimes/evaporates the rust on the surface of steel structure. The authors investigate the effects and the applicability of laser cleaning using the specimens made by accelerated corrosion method. The test results confirmed that the laser cleaning can remove the rust almost much as using sand blast, and the salt on the surface of steel can also be evaporated as good as the rust. Moreover, this method seems can be applied on wet surface condition because the moisture and water on the surface of steel can also be evaporated.

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