Research on wear-resistant materials has always been the focus of attention. The main wear-resistant materials are wear-resistant cast iron, high-manganese steel and low- and medium-alloy wear-resistant cast steel. Among them, the high hardness, excellent wear resistance and impact resistance of low- and medium-alloy wear-resistant steels have been paid more attention by people, and have been applied in products such as liners and hammers. Moreover, the alloy wear-resistant cast steel can adjust the comprehensive mechanical properties of the material in a wide range by adjusting the composition and the heat treatment process. For different products, the requirements for toughness can be met by different alloying and heat treatment processes to meet performance and application requirements.
The medium carbon Cr2MnSiVRE is a wear-resistant cast steel. After quenching at 900, 950, 1000 and 1050 °C, the quenched samples are tempered at 250 °C. As the quenching temperature increases, the structure does not have significant coarsening, but its uniformity is improved. This shows that with the increase of quenching temperature, the expansion ability of carbon and alloying elements is enhanced, the uniformity of each element in steel in austenite is effectively improved, and the degree of segregation of solute formed during casting solidification is also improved. The addition of a trace amount of V serves to refine the grains. The quenching temperature is raised from 900 ° C to 1050 ° C, the hardness value is 54 ~ 53HRC, basically no change, maintaining a high hardness. However, the quenching temperature has a significant effect on the impact toughness, and the impact toughness increases with increasing quenching temperature, and the impact toughness reaches 60 J/cm 2 at 1050 ° C quenching.
The sample was then quenched at 1050 ° C and tempered at various temperatures (200, 250, 280 and 310 ° C) in the low temperature tempering zone. It was found that the impact toughness reached a maximum of 60 J/cm 2 at 250 ° C tempering. Below this temperature or above the tempering, the impact toughness is reduced, wherein the impact toughness of tempering at 280 °C is slightly lower than the value of tempering at 250 °C, reaching 53 J/cm2, but impact tough after 310 °C tempering The degree dropped significantly, only 21J/cm2. The steel is subjected to a suitable heat treatment to obtain higher strength and good toughness.
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