Nowadays, laser hardening is a consolidated process in many industrial sectors. One of the most interesting aspects to be considered when treating surface-hardening steel materials by means devices undoubtedly evaluation heat treatment quality and surface finish. In present study, an innovative method based on fractal geometry was proposed evaluate surface-steel-laser-hardened treatment. A suit...

The porous structure of a material is an important mechanical property that affects the hardness of materials. We cannot apply Euclidian geometry to describe the porosity of hardened specimens because porosity is very complex. Here we use fractal geometry to describe the porosity of robot laser-hardened specimens. In this paper, we describe how the parameters (speed and temperature) of the robo...

Abstract Laser surface hardening is rapidly growing in industrial applications due to its high flexibility, accuracy, cleanness and energy efficiency. However, the experimental process optimization can be a tricky task number of involved parameters, thus suggesting for alternative approaches such as reliable numerical simulations. Conventional laser models compute achieved hardness on basis mic...

A method coupling experiments and simulations, is developed to characterize the yield stress strain hardening of several metals loaded at 106 s?1 < 25 ns, typically involved during Laser Shock Peening. It was applied four materials: pure aluminum, 2024-T3 7175-T7351 aluminum alloys Ti6Al4V-ELI titanium alloy. Thin foils have been irradiated with high-power laser induce high-pressure shock wave....

Optimization of process parameter is one of the ideal goals in laser sintering. The results of this process were measured as output parameters like: density, micro hardening, macro hardening, tension, roughness, stiffness, balling. In this paper, the influence of input parameter such as laser power, scan speed, material powder and etc are surveyed on output parameter like balling affection and ...

Optimization of process parameter is one of the ideal goals in laser sintering. The results of this process were measured as output parameters like: density, micro hardening, macro hardening, tension, roughness, stiffness, balling. In this paper, the influence of input parameter such as laser power, scan speed, material powder and etc are surveyed on output parameter like balling affection and ...

Laser surface hardening is a promising technology to enhance the properties of surfaces. This was used on 42CrMo press brake die. Its behavior investigated by using scanning electron microscopy and backscattering diffraction. The results indicated that martensite in zone significantly finer than substrate. There were many low-angle grain boundaries zone, kernel average misorientation orientatio...

Undeformed face-centred cubic (FCC) high-entropy alloys (HEAs) always possess excellent plasticity but low hardness. In this work, Al alloying on the surface of a CrCoFeNi FCC HEA is realized by laser technique. An Al1.5CoCrFeNi body-centred (BCC) in-situ generated HEA. The well-bonding BCC layer possesses hardness as high 536 HV. hard results in much lower wear rate Al-alloyed specimen than pr...