Li Min,Liu Hongbo,Che Xiaorui,et al.Effort of Rare Earth on High Temperature Thermoplastic of Medium Manganese Wear-resistant Steel[J].Special Steel,DOI:.
Effort of Rare Earth on High Temperature Thermoplastic of Medium Manganese Wear-resistant Steel
The high temperature mechanical properties of medium manganese wear-resistant steel with different rare earth content had been systematically studied by using Gleeble 3500 thermal simulation testing machine, SEM (scanning electron microscope), OLS4100 confocal microscope and metallographic microscope. The results showed that the maximum high temperature tensile strengthen of medium manganese steel increased from 396.64, 228.07, 113.25, 75.15, 42.97, 25.11 MPa to 414.85, 238.28, 130.59,76.14, 44.59,28.09 MPa respectively at 700, 800, 900,1 000, 1 100,1 200 ℃ with 0.038% rare earth content (mass fraction). This is because the addition of rare earths can refine the grain size and increase the tensile strength. Metallographic experiments showed that the grain size of medium manganese steel increased from 6.80 grade to 7.12 grade when rare earth content was 0.038% compared with that without adding rare earth. It was found that the temperature of dynamic recrystallization of manganese in medium manganese steel was delayed from 800 ℃ to 900 ℃ by rare earth addition. In addition, the addition of rare earth can significantly increase the reduction area (R.A.) of medium manganese steel at 1 000 ℃-1 200 ℃ increased from 47.3%, 53.9%, 46.78% to 65.64%, 76.56%, 50.26% respectively. That is, the addition of rare earth significantly improves the high temperature thermoplasticity of medium manganese steel at 1 000 ℃-1 200 ℃.
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