Microstructure Morphology and Mechanical Properties of Steel 30CrMnSiNi2A Irradiated by Continuous Wave Laser

Abstract

Steel 30CrMnSiNi2A slices were irradiated by a continuous wave fiber laser beam with the intensity of 14.5W/cm2. Alloy samples with various temperature processes were obtained by changing the laser irradiation time, irradiation times and atmosphere environment. X-ray diffraction, scanning electron microscope, energy dispersive spectrometer and nanoindentation system were employed to characterize their microstructure morphology and mechanical properties. Three layers were observed in the samples fracture, namely oxide film, hard brittle layer and alloy substrate. The hard brittle layer had a higher hardness and a lower toughness compared with the base metal. Referring to the temperature history, we deemed that the surface oxidation and the solid phase transformation were the main factors which changed laser coupling efficiency. The results also illuminated the correlation between the microstructure morphology and the response to laser irradiation of the samples.

Effect of laser shock peening on microstructure and mechanical properties of laser cladding 30CrMnSiNi2A high-strength steel

“…The multilayer multichannel LC process involves thermal cycling of fast heating and cooling. In the process, the ferrite in the metal powder would be austenitized under heating and then transformed into martensite under fast cooling (the martensite transformation temperature of 30CrMnSiNi2A high strength steel is approximately M s = 300 ℃ 29 ). The lower layer of the LC region is first affected by laser heat, so it transforms fully from austenite to martensite and forms a uniform martensite structure.…”