The
correlation between the microstructures and
wear-resistance of a new type hot-
forged cast die
steel was investigated using forged steel H13 as a comparison. Thus the microstructures of the hot-forged precisely cast die steel after being heat-treated at different conditions were examined by means of transmission electron microscopy. The hardness of the new-type cast die steel
specimens was measured, and their wear behavior under dry sliding against W18Cr4V2 steel at
elevated temperature was evaluated using a pin-on-ring test rig. Moreover, the morphologies of the worn surfaces of the new-type cast die steel specimens and the H12 forged steel specimen were observed using a scanning electron microscope. It was found that the new-type cast die steel specimens had better wear-resistance at elevated temperature than the H13 forged steel specimen. And the wear-resistance of the new-type cast die steel specimens was greatly dependent on the microstructures. Namely, the new-type cast die steel specimens tempered at 400~620 ℃ had better wear-resistance at elevated temperature, while those specimens tempered above 650 ℃ or below 400 ℃ had poor wear resistance at elevated temperatures. The better wear-resistance of the new-type cast die steel specimens tempered at 400~620 ℃ was attributed to the formation of bainite and martensite plus bainite microstructures, while the formation of martensite
microstructure led to a significant decrease in the wear-resistance of the new-type cast die steel specimens tempered at a too high or too low temperature. Moreover, both the new-type cast die steel specimens and the H13 forged steel specimen were characterized by adhesion wear and oxidation wear in sliding against the W18Cr4V2 steel at elevated temperatures.
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