Surface Hardening of Ductile Cast - Iron Using Pulsed Laser Beams

The Effect of Hardening Techniques on Wear Resistance and Fatigue Life of Ductile Cast Iron

“…improvement of 33% and 15% for wear rate respectively. The enhancement in hardness caused decrease in weight loss and these results are in agreement with [19,26]. These achievements can be related to the grained structural refinement after surface treatments that introduced hardened structure and phase transformation of retained austenite phase to martensite.…”

“…Both ductile and grey cast iron showed marked improvement in erosion resistance and hardness to 800 HV and a greatly refined microstructure after laser processing [17]. LP processing parameters effects were observed on microstructure of ductile iron leading to solid state transformation and martensite in the transformed zone or heat-affected zone [18], and resulted in induced phase transformation of retained austeninte to martensite and increment in hardness (381-606HV) and improvement in wear resistance [19], also formation of austenite and ledeburite structure in the treated zone and microhardness was enhanced from 250 HV to (500-1100 HV) with laser travel speeds (0.5-100 cm/s) [20]. Laser surface hardening of nodular cast iron (GG10) caused dissolved graphite nodules and fine dendritic structure comprising retained austenite with some martensite and cementite and hardness improvement from ranged 800-900 HV compared to untreated iron with 150 HV [21].…”