Purpose: Purpose of this paper is investigation of influence of the surface processing by laser method on the cavitation performance of the Fe-Cr-Mn and Fe-Cr-Co alloys. This kind of alloys are frequently used in Polish power plants to routine repairs of damaged blades working under cavitation loading. Design/methodology/approach: Padding welds were tested for three cases: without additional pr...

Thermal and thermomechanical phenomena in laser metal interaction are of great importance in terms of understanding the underlying mechanisms in laser materials processing, optimizing the efficiency of laser micro-machining, and minimizing laser induced damage. In this work, Molecular Dynamics (MD) simulation is carried out to investigate picosecond laser copper interaction. A method has been d...

Effective control of melting and solidification behaviours of materials is significant for numerous applications. It has been a long-standing challenge to increase the melted zone (MZ) depth while shrinking the heat-affected zone (HAZ) size during local melting and solidification of materials. In this paper, nanoparticle-induced unusual melting and solidification behaviours of metals are report...

This paper reports modeling improvements for micro-scale laser shock processing (LSP), fatigue testing of shock processed copper samples, and microstructure characterization of shock processed materials (Cu and Ni). Plasma expansion is modeled as laser supported combustion wave, in which radial and axial expansions are considered. Stress/strain analysis is extended to three-dimensional and take...

The removal of thin films widely used in photovoltaics as (transparent) electrodes (e.g. SnO2, molybdenum) or solar absorber (e.g. amorphous silicon) materials is studied experimentally using multi-kHz diode-pumped solid state lasers in the visible and infrared spectral region. The film processing (or what is commonly known as P1, P2, or P3 laser scribing) is performed through the film-supporti...

The NASA Lewis Research Center has designed and fabricated a closed-cycle, continuous wave (CW), carbon dioxide (COj) high-power laser to support research for the indentlflcatlon and evaluation of possible high-power laser applications. The device Is designed to generate up to 70 kW of laser power In annular-shape beams from 1 to 9 cm In diameter. Electric discharge, either self-sustained or el...

Because of the unique laser–matter interaction processes involved, femtosecond laser micro-machining and femtosecond laser materials processing techniques are developing rapidly to stages where they may be introduced into manufacturing. Yet in both these areas, some complex interaction phenomena are not fully understood. In this talk we describe two studies of fundamental processes that impact ...