The mechanical properties microstructures and precipitation behaviors in aisi american iron and steel institute h13 steel tempered at 863 k for 0 5 2 4 10 and 20 h were investigated. Ultrasonic heat treatment microstructure grain size h13 tool steel. However the elongation 12 4 is a factor of 3 times higher and the impact energy 14 4 j of the slm specimen is somewhat lower.
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