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Laser Cladding of Heat-Resistant Iron Based Alloy
摘要： The paper presents the results of the composition, structure and mechanical characteristics of heat-resistant iron based alloy samples produced by laser cladding. The samples were manufactured using secondary raw material (chips), which were converted into powder by plasma spheroidization. The crystalline transformations for the as-processed as well as after several heat treatment conditions were analyzed. Phase, chemical composition and mechanical characteristics were investigated.
关键词： mechanical properties,additive manufacturing,heat-resistant iron based alloy,microstructure,laser cladding
更新于2025-09-16 10:30:52
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Hybrid forming mechanism of patternless casting and laser cladding
摘要： In accordance with the requirement of manufacturing dies quickly and economically, a hybrid forming method of stamping dies for automobile panels is proposed. The method combines digital patternless casting and high-power laser cladding. An experimental study is conducted on the hybrid forming process and its trial production and application in the manufacturing of stamping dies for typical panels. Results prove that the laser cladding layer exceeds HRC60 (Rockwell hardness) and thus meets the production efficiency requirement of automobile dies. The rate of defects is well controlled. Compared with traditional technology, this technology has remarkable advantages and advancement.
关键词： forming,rapid tooling,laser cladding,patternless casting,hybrid
更新于2025-09-16 10:30:52
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Research on Microstructure and Hardness of Laser Cladding Using the Mixed Powder of Nano-TiC and Ni-Based Alloy
摘要： Aiming at the problem of poor high-temperature wear-resistance of rope clamp used in super-high speed elevators, the experiments of laser cladding to prepare carbide reinforced composite coating were made. Nano-TiC powder, Ni-based alloy powder were used as cladding material. The microstructure and hardness of composite coating were tested by relevant equipments. The research results show that the composite coating is made up of TiC, Cr3C2, Fe3C and Fe-Ni-Cr-C solid solution. When the content of TiC is 10%, 30%, the morphology of TiC is presented as dendrite-like and the morphology of solid solution is presented as cellular-like. When the content of TiC is 50%, the morphology of TiC is presented as block-like, lath-like. There are some microcracks on grain boundaries. At the content of 30%, laser power 1.5KW, scanning speed 600mm/min, the laser cladding has no crack and hole. The average hardness of composite coating is 701HV0.2. Using this technology to the surface strengthening of elevator parts, the wear resistance and service life can be greatly improved.
关键词： nano-TiC,laser cladding,hardness,composite material,microstructure
更新于2025-09-16 10:30:52
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Enhanced wear resistance and new insight into microstructure evolution of in-situ (Ti,Nb)C reinforced 316??L stainless steel matrix prepared via laser cladding
摘要： An MC (M: Ti,Nb) carbide-reinforced 316 L coating was synthesized in-situ via laser cladding. A strong relationship between the (Ti,Nb)C content and the microstructure and tribological properties of the resulting components was established. This relationship helped explain the in?uence of the (Ti,Nb)C content on the phase evolution, microstructure characteristics, and exothermic reaction behavior. It was found that the size and morphology of in-situ generated (Ti,Nb)C particles changed as the carbide content increased. When the MC carbide content increased from 2.5 wt% to 10 wt%, the morphology of in-situ generated (Ti,Nb)C evolved from irregular geometry particles, to spherical particles, and ?nally into near-regular geometry. When the carbide content reached 15 wt%, the (Ti,Nb)C particles displayed an equilibrium octahedral structure. The calculated formation enthalpy of MC carbides showed that the reaction enthalpy increased with the MC carbide content, which a?ected the dynamic temperature of the molten pool and eventually led to carbides with di?erent crystal morphologies and sizes. Room-temperature dry sliding friction and wear tests showed that the submicron (Ti,Nb)C carbide reinforced (carbide content: 5 wt%) coating and 1.5 ??m regular octahedral particle-reinforced coating (carbide content: 20 wt%) exhibited a lower friction coe?cient and wear volume loss. Understanding the morphological evolution mechanism of (Ti,Nb)C and its corresponding tribological behavior will enable the development of guidelines to obtain (Ti,Nb)C/316 L metal matrix composite coatings produced by laser cladding.
关键词： (Ti,Nb)C,Laser cladding,Tribological behavior,Microstructure,In-situ
更新于2025-09-16 10:30:52
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Investigation of Geometric Characteristics in Curved Surface Laser Cladding with Curve Path
摘要： Laser cladding on curved surfaces is essential in industrial applications for restoration and remanufacturing of high-value parts. This study investigated the in?uence of di?erent factors on clad width, clad height, and dilution rate in curved surface laser cladding with curved path. Mathematical models were developed using central composite designs to predict these geometric characteristics by controlling laser power, scanning speed, gas ?ow, and altering the outside radius of the cylindrical substrate. Analysis of variance and response surface methodology indicated that clad width increased with increasing laser power and reducing scanning speed. Clad height positively correlated to laser power and negatively correlated to the outside radius of the cylindrical substrate. Increasing the laser power while decreasing the scanning speed led to an increase in dilution rate. Afterwards, the geometric characteristics of the clad were improved by optimizing these factors with the target to maximize clad width and height as well as to minimize dilution rate. The di?erence between model predictions and experimental validations for clad width, clad height, and dilution rate were 3.485%, 3.863%, and 6.566%, respectively. The predicted accuracy was veri?ed with these models, and they were able to provide theoretical guidance to predict and control the geometric characteristics of curved surface laser cladding with a curved path.
关键词： central composite design,curved surface,forming control,curve path,laser cladding
更新于2025-09-16 10:30:52
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The influence of laser engineered net shaping (LENSa?￠) technological parameters on the laser deposition efficiency and properties of H13 (AISI) steel
摘要： A successful attempt at laser cladding of H13 (AISI) hot work tool steel by the laser engineered net shaping technique is presented. Technological parameters, such as laser spot diameter, powder flow rate, and deposition velocity, were changed during the experiment. The influences of the different technological parameters on the efficiency of the cladding, geometry of the clads and properties of the deposited material were investigated. As a result, 75 different samples were deposited. The efficiency of the cladding varies significantly within the chosen range of parameters and is as low as several percentage points. The chosen parameters also appear to affect the shape of the clad, size of the heat-affected zone, microstructure and hardness of the steel, which ranged from 500 to 800 HV after deposition. The proper choice of parameters led to the desired surface hardness of the deposited material, and a heat treatment of the final product may not be necessary.
关键词： Clads geometry,Direct energy deposition,Deposition efficiency,Laser cladding,Microstructure,H13 tool steel,Microhardness,LENS?
更新于2025-09-16 10:30:52
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A contribution to laser cladding of Ti-6Al-4V titanium alloy
摘要： A wear resistant coating was successfully made on an annealed Ti-6Al-4V titanium alloy by laser surface cladding using 60 wt.% WC + wt.% 40 NiCrBSi powder blends. Coaxial laser cladding was performed by means of Yb:YAG disk laser with a 3-KW continuous wave. Different laser interaction times were attempted to get the optimal conditions for promising mechanical properties. The new contribution was to accomplish larger clad layer thickness with applying the shortest possible laser interaction time that can achieve superior clad layer properties. This will decrease energy consumption with an expected money saving which is an essential factor for successful engineering solutions. A high powder ?ow rate of 20 g.min(cid:1)1 was intended in order to obtain a thick, nonporous and crack free clad layer. The clad samples were subjected to thorough microstructure investigations, in addition to microhardness and wear evaluation. The coating so produced exhibits multiple hardness values and exceptional wear resistance under adhesive/sliding wear conditions. The obtained results expose clad layer with superior quality that was achieved at a laser interaction time of 0.3 s. An enhancement in the microhardness values of the clad layers by more than fourfold was attained and the wear resistance was thus signi?cantly improved.
关键词： coaxial laser cladding process,titanium alloy,laser powder cladding,laser interaction time,microhardness,laser surface treatment,wear resistance
更新于2025-09-12 10:27:22
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Research of technological possibility of increasing erosion resistance rotor blade using laser cladding
摘要： The publication describes the results of the research of the influence of the parameters of the mode of a laser deposition on the metallurgy of deposited layers, mechanical characteristics and deformations of the samples. Plates, which had made of PC E36 steel and 15Cr11MoW steel, were used as samples. According to the results of experimental researches the peripheral areas of the input edges of the blades were made. Also, an experimental research was conducted on how the parameters of the mode and trajectory of the deposition influence on mechanical and operational characteristics, as well as the deformations forming in the product during the laser surfacing of the Stellite 6 alloy influence on the heat-resistant high-alloy steel 15Cr11MoW.
关键词： Rotor blade,15Cr11MoW,Stellite 6,ytterbium fiber laser,cladding blade,РС Е36,Inconel 625,laser cladding
更新于2025-09-12 10:27:22
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Design and Manufacturing of a Protective Nozzle for Highly Reactive Materials Processing via Laser Material Deposition
摘要： Laser Material Deposition (LMD) is a near-net-shape additive process. Powder particles are usually employed as filler material, which is injected through a powder nozzle (coaxial or off-axis) and then completely molten by a laser beam. The possibility to add material on complex 3D surfaces makes LMD a key process in the repair and wear/corrosion protection applications. The present work is focused on the improvement of the design & manufacturing of a LMD nozzle, what introduces two main advantages: the possibility to process a wider variety of materials by generating a protective atmosphere and the improvement of the efficiency of the nozzle. The results of numerical simulations are used for optimizing the design of the protective cone of the LMD nozzle, which is then manufactured and experimentally validated. Finally, the proper performance of the resultant nozzle is tested depositing Ti6Al4V.
关键词： efficiency,reactive materials,protective atmosphere,simulation,laser material deposition,oxidation-free,laser cladding,coaxial nozzle
更新于2025-09-12 10:27:22
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New approach in selective laser cladding
摘要： The new approach in selective laser cladding using conical laser beams has been elaborated. Initial round laser beam is divided into 2 circular beams with regulated distribution of the laser power throughout the circular beams. Circular beams are transformed to conical beams, which are focused separately on the surface and on the deposited material for heating. The laser energy delivery to powder stream is very efficient because a total uniform absorption of laser energy in the dense powder stream (104-105 1/cm3). Under wire deposition the heating of substrate reduces the residual stresses due the reduction temperature gradients and compensates heat losses from deposition zone by thermal conduction. The required power density for melt contact formation is significantly reduced.
关键词： high efficiency,deposited material,separated heating,conical laser beams,laser cladding
更新于2025-09-12 10:27:22