Papers by Keyword: Laser Cladding Process

Abstract: The turbine blades utilized in this investigation were made of alloy steel type 52, the same steel used in electric power plants. The current research aims to study the effect of corrosion fatigue behavior on turbine blades when cyclic loads and corrosion work together to degrade a material's mechanical properties. As a result, many engineering structures and components experience early failure. Laser cladding is a method of laser surfacing to improve or rejuvenate the surface of an object. This parameter was used in the cladding process. 132 watts of laser power, with a peak output of 1.83 kilowatts, was used to generate the pulses, with each pulse containing 11 joules of energy. The results reveal that the specimen's microstructure is smoother following the laser cladding procedure and that the corrosion fatigue resistance in the air (without solution) is increased. This paper will look at how laser cladding impacts turbine blades.

Abstract: Nickel-base alloy powder is widely applied to strengthen the surface of products through laser processing. This paper presents the experiments on laser cladding of Ni45 alloy powder on substrates of 45 steel. The experimental results show that the laser cladding processing parameters such as laser power, scanning speed, powder feed rate and overlap ratio have great effects on the qualities of the cladding layer. Optimizing the processing parameters is an effective way to improve the layer qualities and obtain desired cladding layers.

Abstract: Complex approach to studying both qualitative and quantitative friction and wear characteristics of laser-clad layers has been applied. Both type and value of wear, friction factors have been determined as depended of the coating composition, load and temperature in dry friction. Comparative analysis between laser cladding and plasma spraying has been carried out.

Abstract: A 3-D modeling based on the numerical resolution of fluid flow and heat transfer are utilized to investigate the thermal phenomena during laser laser-cladding processes of BT20 alloy. From this model, it has been found that the shape and size of the molten pool in the work piece are affected by laser cladding parameters such as scanning speed and the incident laser power. The effects of process parameters on the melt pool are quantitatively discussed by numerical analysis. Furthermore, it has been observed that the surface tension temperature coefficient, Marangoni convection, which is sensitive to the active elements in the titanium alloy composition, also affect the pattern of the fluid flow in the molten pool.

Abstract: A 3-D modeling based on the numerical resolution of fluid flow and heat transfer for laser-cladding processes of In718 Superalloy is proposed. The implementation of developed procedures allowed us to treat the problem with specific and complex boundary conditions. The applied loading is a moving heat source that depends on process parameters such as power density, laser beam diameter and scanning speed. The effects of process parameters on the melt pool are quantitatively discussed by numerical analysis. The computational results present good coincidences with the corresponding experiments of laser cladding process.

Abstract: In this paper, a three-dimensional simulation model for laser-cladding processes of magnesium alloys is proposed. The applied loading is a moving heat source that depends on process parameters such as power density, laser beam diameter and scanning speed. The effects of process parameters on the melt pool are quantitatively discussed by numerical analysis. In these parameters, Marangoni force is the most important in affecting the molten metal flow and the contour of the melt pool. Both the length and depth of the melt pool vary sharply with temperature dependence of surface tension when the absolute value of this temperature dependence is at lower value.

Abstract: The optimization of processing parameters for laser cladding process based on Statistical Analysis System (SAS) software was investigated and the experimental investigation on Ni-based alloy components fabricated by laser cladding was carried out. The influences of the main processing parameters on the surface quality were analyzed, and the Ni-based components with superior surface quality were obtained by employing the optimum set of parameters. The surface morphology and microstructure of the components were analyzed. Results indicate that the surface of the cladding is rather smooth and the claddings have a unique microstructure consisting of primary dendrite. The laser cladding layer with integrated melt interface and without reheat cracking can be obtained by optimizing the process variables. The investigations show that the components fabricated by laser cladding process have better mechanical properties than that of the conventional manufacturing technology.