Mechanical properties and the precipitation evolution of second phase of high manganese high aluminum lightweight steels as-cast and solution treated with different aluminum contents(10％,12％,14％,mass fraction)were investigated by using methods such as phase analysis,microstructural characterization and room temperature tensile and hardness tests.The results show that under as-cast state,with the increase of Al content,the content of ferrite in the tested steels increases and precipitating discontinuously between austenite grains,the size of K-carbides continuously increases and mainly precipitating within austenite grains.After solution treatment at 1100 ℃,the tested steels exhibit improved strength and plasticity.The tested steel with 12％aluminum obtains excellent comprehensive properties,of which the density is 6.41 g·cm-3,the specific strength is 157 MPa·cm3·g-1,the elongation after fracture is 26.2％.
high manganese high aluminum lightweight steelAl contentsolution treatmentK-carbidemechanical properties
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