Abstract: Low-alloy cast steel with high strength low-carbon has great potential for development and economic benefits due to its excellent mechanical and physical chemical properties. Through reasonable composition design and heat treatment,it has become a technical problem to obtain low alloy with simple preparation process, high strength and toughness, low cost, less pollution, good low-temperature toughness and weldability. In this paper, a kind of austenite-martensite high-strength alloy with high corrosion resistance was studied. The alloy can achieve excellent strong plasticity through the good match of composition and heat treatment. Based on the statistical analysis of the microstructure and properties of the alloy, the main factors affecting the mechanical properties of the alloy were found, which laid a solid foundation for the mass production of the alloy. The results show that at the same tempering temperature, with the increase of carbon content, the tensile strength at room temperature increases and the plasticity decreases; with the same carbon content, the tempering temperature increase from 480 ℃ to 540 ℃, the tensile strength increases first and then decreases at room temperature, reaches the peak value of 1 552 MPa at 520 ℃, the impact toughness increases first and then decreases, and reaches the maximum value of 54 J·cm-2 at 500 ℃. After changing the cooling mode of heat treatment from air cooling to oil cooling, the strength and plasticity of the alloy are greatly improved. The tensile strength at room temperature reaches 1 580 MPa, and the impact toughness reaches 100.6 J·cm-2.
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2020, Vol. 34 
