Effect of Rare Earth on Microstructure and Impact Property of 23CrNiMoA Steel
The effects of rare earth on the microstructure and impact property of 23CrNiMoA steel were studied by metallographic microscope,impact tester,scanning electron microscope and energy spectrum.The results show that the metallographic structure of 23CrNiMoA steel has no obvious change after adding 0.018wt%lanthanum cerium metal.At room temperature(20℃),the longitudinal and transverse impact absorbed energy of the test steel increase from 86.0 J and 70.3 J to 93.7 J and 85.7 J,respectively,the isotropy increases by 11%,and the impact properties are significantly improved.In addition,by observing the impact fracture morphology of the test steel,it can be seen that after the addition of rare earth,the number of dimples at the fracture of the steel increases and the distribution is uniform.At the same time,there is spherical RE inclusions of about 1 μm at the bottom of these large and deep dimples,which greatly improves the absorbed energy required for crack propagation during impact fracture,and plays a good role in improving the impact property of 23CrNiMoA steel.
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