Effect of Mixed Rare Earth La,Ce on the Microstructure and Inclusion Modification of Cast High Manganese Steel
The effect of La-Ce mixed rare earth elements on the microstructure,inclusions,and mechanical properties of cast high manganese steel was studied by using trace rare earth La-Ce microalloyed high manganese cast steel for modification treatment,and detection methods such as metallographic microscope,scanning electron microscope,energy dispersive spectrometer,impact testing machine,and microhardness tester.The results show that a trace amount of rare earth La-Ce shortens the columnar crystal zone,expands the equiaxed crystal zone,reduces the secondary dendrite spacing,and refines the grain boundary carbides in the as-cast structure of high manganese steel.At the same time,the inclusions in the steel undergo denaturation,transforming from polygonal TiN,Al2O3,and MnS composite inclusions into ellipsoidal or spherical rare earth containing composite inclusions.Rare earth La-Ce improves the impact toughness and microhardness of as cast high manganese steel.The transverse impact energy increases by 32.3%,67.5%,and 170.0%respectively at 0℃,-20℃,and-40℃test temperatures,and the low-temperature toughness improvement is more significant.The microhardness HV10 has been increased from 221 to 238.
high manganese steelrare earthinclusionsimpact energy
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