The effect of surface laser melting on a rare earth rich magnesium alloy (Mg-Nd2.8-Gd1.5-Zr0.5-Zn0.2) was studied. Samples extracted from sand cast plates were surface laser melted (SLM) using 3.3 kW diode laser, then heat treated according to standard T6 conditions. Microstructural characterization on cross-sections of the SLM specimens allowed to identify four different areas: the remelted zone (RZ), mainly composed by fine grained equiaxed microstructure; the transition zone (TZ), consisting of columnar grains; the heat affected zone (HAZ), characterized by the partial dissolution of second phases and eutectic compound; the base material (BM). The T6 heat treatment after LSR induced a substantial grain growth in the RZ, resulting in a decrease of tensile properties in comparison to the T6 heat-treated alloy not subjected to laser remelting, despite substantially similar Brinell hardness values were registered.
Ceschini, L., Angelini, V., Morri, A., Tarterini, F., Fortunato, A., Liverani, E. (2016). Effect of surface laser melting on microstructure and mechanical properties of the rare earth rich Mg alloy EV31A. LA METALLURGIA ITALIANA, 6, 13-16.
Effect of surface laser melting on microstructure and mechanical properties of the rare earth rich Mg alloy EV31A
CESCHINI, LORELLA;MORRI, ALESSANDRO;TARTERINI, FABRIZIO;FORTUNATO, ALESSANDRO;LIVERANI, ERICA
2016
Abstract
The effect of surface laser melting on a rare earth rich magnesium alloy (Mg-Nd2.8-Gd1.5-Zr0.5-Zn0.2) was studied. Samples extracted from sand cast plates were surface laser melted (SLM) using 3.3 kW diode laser, then heat treated according to standard T6 conditions. Microstructural characterization on cross-sections of the SLM specimens allowed to identify four different areas: the remelted zone (RZ), mainly composed by fine grained equiaxed microstructure; the transition zone (TZ), consisting of columnar grains; the heat affected zone (HAZ), characterized by the partial dissolution of second phases and eutectic compound; the base material (BM). The T6 heat treatment after LSR induced a substantial grain growth in the RZ, resulting in a decrease of tensile properties in comparison to the T6 heat-treated alloy not subjected to laser remelting, despite substantially similar Brinell hardness values were registered.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
