Characterization of Fusion Lines Obtained with Laser Welding on Ductile Iron Plates

2016 ◽  
Vol 254 ◽  
pp. 33-42
Author(s):  
Ioan Catalin Mon ◽  
Mircea Horia Tierean ◽  
Eugen Cicala ◽  
Michel Pilloz ◽  
Iryna Tomashchuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Welding Speed ◽  
Ductile Iron ◽  
Continuous Laser ◽  
Welding Defects ◽  
Criteria For Selection ◽  
Selection Of ◽  
Melted Metal

This paper studies the ductile iron (DI) weldability using laser welding. For performing an Yb:YAG continuous laser was used, with a maximum power of 6 kW. The parametrical window power (P) - welding speed (S) was explored by carrying out the fusion lines on ductile iron plates without preheating, to determinate areas of weldability (complete penetration, correct geometry) to allow further characterization. The criteria for selection of focus areas were the geometry of the fusion lines and the absence of the welding defects. The unsatisfactory domains were characterized by: collapse of the melted metal, incomplete penetration, low fusion lines quality (geometry, compactness). In present study, several values of power and welding speed have been tested to identify their influence on geometry, compactness of the joints and mechanical properties. As result, the power-welding speed diagram for feasible domains of laser welding was generated.

Elaboration and Characterization of the Properties of Refractory Cr Base Alloys

2010 ◽  
Vol 72 ◽  
pp. 46-52 ◽  
Author(s):  
Laurent Royer ◽  
Stéphane Mathieu ◽  
Christophe Liebaut ◽  
Pierre Steinmetz
Keyword(s):  
Mechanical Properties ◽  
Melting Point ◽  
Molten Glass ◽  
Energy Production ◽  
Creep Properties ◽  
Refractory Alloys ◽  
Industrial Use ◽  
Kinetics Of ◽  
Selection Of

For energy production and also for the glass industry, finding new refractory alloys which could permit to increase the process temperatures to 1200°C or more is a permanent challenge. Chromium base alloys can be good candidates, considering the melting point of Cr itself, and also its low corrosion rate in molten glass. Two families of alloys have been studied for this purpose, Cr-Mo-W and Cr-Ta-X alloys (X= Mo, Si..). A finer selection of compositions has been done, to optimize their chemical and mechanical properties. Kinetics of HT oxidation by air, of corrosion by molten glass and also creep properties of several alloys have been measured up to 1250°C. The results obtained with the best alloys (Cr-Ta base) give positive indications as regards the possibility of their industrial use.

scholarly journals The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

2017 ◽  
Vol 62 (3) ◽  
pp. 1703-1712 ◽  
Author(s):  
M. Łazińska ◽  
T. Durejko ◽  
W. Polkowski
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Intermetallic Alloy ◽  
First Principle ◽  
Metal Pool ◽  
Structure And Properties ◽  
Indirect Methods ◽  
Α Al2o3 ◽  
Melted Metal

AbstractResults of the first principle study on a fabrication of FeAl intermetallic based alloy with an addition of nanometric αAl2O3(n-Al2O3) particles by the LENS method and a subsequent characterization of the as received materials’ structure and properties, are shown in the present work. A series of samples were manufactured using LENS technique while a control of temperature and the size of melted metal pool. The presence of ceramics nanoparticles was not directly confirmed by microscopy observations. Neither aluminum nor oxygen content was not elevated in the material with n-Al2O3content. Although, indirect methods revealed influence of n-Al2O3addition on the manufactured elements structure. Analyses of porosity has shown that addition of 2% vol. n-Al2O3significantly decreases this feature (~1%), as compared to the reference material made of pure FeAl intermetallic alloy (~5%). The addition of n-Al2O3causes an increase of grain size in Fe40Al intermetallic alloy. An oxidation resistance has been also improved what was associated to the n-Al2O3addition. Four times lower increase of samples mass was noticed for sample with the n-Al2O3addition as compared to the pure Fe40Al intermetallic alloy.

scholarly journals Design and Manufacturing of a Nd-Doped Phosphate Glass-Based Jewel

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2321
Author(s):  
Diego Pugliese ◽  
Federico Simone Gobber ◽  
Ilaria Forno ◽  
Daniel Milanese ◽  
Marco Actis Grande
Keyword(s):  
Mechanical Properties ◽  
Phosphate Glass ◽  
Industrial Design ◽  
Incident Light ◽  
Metal Alloy ◽  
Light Wavelength ◽  
Design And Manufacturing ◽  
Incident Light Wavelength ◽  
Selection Of

This paper reports the results of the designing, manufacturing and characterization of a jewel obtained by means of coupling the dogmas of industrial design to the analytical engineering approach. The key role in the design of the jewel was played by an in-house synthesized Neodymium (Nd)-doped phosphate glass, selected due to its easy handling and capability to change color according to the incident light wavelength. The glass core was covered by a metal alloy to mitigate its relatively high fragility and sensitivity to thermal shock and, at the same time, to highlight and preserve its beauty. The selection of the proper metal alloy, having thermo-mechanical properties compatible with those exhibited by the glass, was carried out by means of Ashby’s maps, a powerful tool commonly adopted in the field of industrial design.

On the issue of selecting and optimizing parameters of continuous laser welding of cast iron

2021 ◽  
Vol 23 (3) ◽  
pp. 20-30
Author(s):  
Dmitry Ilyushkin ◽  
◽  
Valery Soldatov ◽  
Oleg Petrakov ◽  
Irina Kotlyarova ◽  
...  
Keyword(s):  
Cast Iron ◽  
Laser Welding ◽  
Weld Pool ◽  
Process Parameters ◽  
Welding Speed ◽  
Optimization Problem ◽  
Radiation Power ◽  
Geometric Parameters ◽  
Continuous Laser ◽  
Passive Experiment

Introduction. Cast iron extremely poorly tolerate thermal welding cycles, and therefore it is necessary to choose carefully the technological parameters. The main parameters of continuous laser welding are: the power of laser radiation, the welding speed, the parameters of the focusing system. The aim of the work is to determine the optimal power and speed of continuous laser welding of cast iron, depending on the geometry of the weld. In this paper, the welding seams obtained on samples of gray alloyed cast iron with a pearlitic metal base, using an LS-1 ytterbium fiber laser, are studied. Research methods. The geometric parameters of the joints were quantified in the program for quantitative analysis and image processing ImageJ. The obtained data were processed by regression analysis. To optimize the process parameters, an orthogonal plan of the passive experiment was developed, including nine experiments in which the factors varied at three equally spaced levels. The quality parameters in the passive experiment were the geometric dimensions of the weld pool and the size of the quenched zone. To solve the optimization problem, we used the methods of gray relational analysis and linear programming. Results and Discussions. The obtained regression models explain a significant proportion of the variance of the dependent variables, the regression coefficients, as well as the models themselves, are statistically significant, which indicates a close linear relationship between the seam geometry and the process parameters. The calculated shape of the weld pool depending on the radiation power and welding speed shows that the required welding seam of the required dimensions can be obtained at various process parameters which allow solving a multi-criteria optimization problem. The gray relational evaluation of the geometric parameters of the seam shows that the most correct parameters in terms of obtaining the seam of the maximum depth with the minimum width, convexity (concavity) and the quenched zone are the minimum power and maximum welding speed. The calculation of the optimal radiation power and welding speed depending on the seam depth showed that welding of small thicknesses is optimally carried out with minimal power, and the seam depth is adjusted by changing the beam speed. Welding of large thicknesses is optimal at high speed, and to increase the depth of the seam, the power must increase.

The Impact of the Laser Welding Speed on the Mechanical Properties of Joints in Multilayer Pipes

2012 ◽  
Vol 726 ◽  
pp. 133-140 ◽  
Author(s):  
Stanisław Mroziński ◽  
Michał Piotrowski
Keyword(s):  
Mechanical Properties ◽  
Fatigue Life ◽  
Laser Welding ◽  
Welding Speed ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Aluminum Layer ◽  
Static Tests ◽  
The Impact

The paper assessed the impact of the laser welding speed on the strength and fatigue properties of the aluminum layer found in multilayer pipes. The conducted experiment has shown that during the adjustment of the welding speed one has to take into account not only the results of static tests, but also the results of fatigue tests. The impact of the welding speed on fatigue life depends on the level of stress max. This level is slight in the area of the biggest stresses and increases along with the decrease in stresses.

Effect of Laser Welding on the Mechanical Properties AISI 1018 Steel

MRS Advances ◽  
2017 ◽  
Vol 2 (64) ◽  
pp. 4031-4039 ◽  
Author(s):  
M. A. Carrizalez-Vazquez ◽  
M. Alvarez-Vera ◽  
A. Hernández-Rodríguez ◽  
J. M. Orona-Hinojos ◽  
Gabriel Sandoval-Vázquez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Fusion Zone ◽  
Heat Affected Zone ◽  
Welding Speed ◽  
Laser Power ◽  
Steel Plates ◽  
Welding Joints ◽  
Welding Processes

AbstractLaser welding processes offer significant advantages such as high welding speed, narrow heat affected zone and quality of the welding joint. In this study, the process parameters of laser power and welding speed were modified for AISI 1018 steel plates of 8 mm thickness and compared using finite element method. The results of cross-section microstructure, heat affected zone and fusion zone were characterized. The grain refinement was affected as the parameters were modified. Tensile and microhardness tests were performed to determine the mechanical properties of the welding joints. Microhardness increased in fusion zone and decreased in heat affected zone. Tensile test showed ductile fracture in heat affected zone of the welding joints. The simulated profiles were compared with the experimental observations showing a reasonable agreement.

Experiment-based regional characterization of HAZ mechanical properties for laser welding

2015 ◽  
Vol 78 (9-12) ◽  
pp. 1629-1640 ◽  
Author(s):  
Chunhua Wei ◽  
Jing Zhang ◽  
Shanglu Yang ◽  
Wu Tao ◽  
Fengshun Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Welding

scholarly journals Microstructure and mechanical properties of CuNiMo austempered ductile iron

2004 ◽  
Vol 40 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Olivera Eric ◽  
Marina Jovanovic ◽  
Leposava Sidjanin ◽  
Dragan Rajnovic
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Bainitic Ferrite ◽  
Austempered Ductile Iron ◽  
X Ray Diffraction ◽  
Microstructure And Mechanical Properties ◽  
Cast Ductile Iron

Microstructure and mechanical properties of Cu, Ni and Mo alloyed cast ductile iron have been investigated after austempering. Samples were austenitised at 860oC for 1h and then austempered at 320oC and 400oC in the interval from 0,5 to 5h. The X-ray diffraction technique and the light microscopy were utilized to investigate the bainitic transformation, while tensile and impact tests were performed for characterization of mechanical properties. By austempering at 320oC in the range between 2 and 5h, a microstructure typical for austempered ductile iron was produced, i.e. a mixture of free bainitic ferrite and highly carbon enriched retained austenite. The characteristic of the whole range of austempering at 400oC is the appearance of martensitic structure. The maximum impact energy (133 J) coincides with the maximum value of volume fraction of retained austenite that was obtained after 2,5h of austempering at 320oC. The appearance of martensite during austempering at 400oC is the main cause for much lower tensile properties than at 320oC.

scholarly journals Mechanism of Damage of Ferritic Ductile Iron, Influence of Matrix Heterogeneity

2018 ◽  
Vol 925 ◽  
pp. 288-295 ◽  
Author(s):  
Diego O. Fernandino ◽  
Roberto Enrique Boeri ◽  
Juan M. Massone
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
Computational Modelling ◽  
Metallic Matrix ◽  
Ductile Cast Iron ◽  
Uniaxial Tensile ◽  
Damage Mechanisms ◽  
Ferritic Matrix ◽  
Micro Scale

Ferritic ductile cast iron (FDI) microstructure is composed by graphite nodules embedded in a ferritic matrix. It is usual to assume that the ferritic matrix is homogeneous. However, the experimental analysis shows impurities and in some cases a high degree of heterogeneity. It is necessary to investigate the influence of these heterogeneities on the mechanical properties of FDI.This work focusses on the characterization of the elastoplastic properties of different zones of the ferritic matrix of FDI and the identification of the sequence and extent of the damage mechanisms at the micro-scale under uniaxial tensile loading.The methodologies for the characterization of the material micro constituents and micro-segregated zones involve nano-indentation and atomic force microscopy techniques in combination with computational modelling. The analysis is performed by applying inverse analysis algorithms proposed in the literature. The microsegregated zones are identified by using color etching. The assessment of the micro-scale damage mechanisms was performed by in-situ optical microscopy observation of tensile tests of very small specimens.The results led to the quantification of the differences in mechanical properties along the metallic matrix as a result of the existing heterogeneities and allow for a better understanding of the ductile iron damage mechanism.

scholarly journals SEM and XRD Characterisation of Fusion Lines Obtained on Austempered Ductile Iron by Laser Beam Welding without Preheating

2021 ◽  
Vol 13(62) (2) ◽  
pp. 1-8
Author(s):  
I.C. MON ◽  
Mircea Horia ȚIEREAN ◽  
Liana Sanda BALTEȘ
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Heat Affected Zone ◽  
Welding Speed ◽  
Ductile Iron ◽  
Laser Power ◽  
Laser Beam Welding ◽  
Xrd Analysis ◽  
Austempered Ductile Iron ◽  
Melted Zone

This study highlights the weldability of austempered ductile iron (ADI) using laser welding. SEM, EDS and XRD analysis were performed on fusion lines, heat affected zone (HAZ) and melted zone (MZ). Welding speed (Ws) and laser power (P) were varied. The heat affected zone is composed of graphite, perlite and martensite; the melted and solidified zone contains graphite, ferrite and cementite. XRD results are in accordance with SEM micrographs.

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