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The 30MnCrNiMo alloy steel was modified by La-Ce mixed rare earth. The experiment used metallographic microscope, scanning electron microscope and energy spectrum to analyze the improvement behavior of rare earth on the as-cast structure of the alloy steel, the structure after heat treatment, and the morphology of inclusions; a thermal dilatometer was used to analyze the phase transition point, and a reasonable heat treatment process was developed; the effect of rare earth on the mechanical properties of alloy steel at room temperature, low temperature impact and tensile was analyzed. The results show that the 30MnCrNiMo alloy steel modified by rare earth has better refinement of the as-cast grains and the grains after heat treatment, and the size, morphology and distribution of inclusions have been improved. The addition of rare earths improves the impact toughness, especially the low-temperature impact. Compared with alloy steel without rare earth, the toughness can be increased by up to 38%, and the alloy strength has been improved to a certain extent.

Effect of La-Ce on Microstructure and Properties of 30MnCrNiMo Alloy Steel