Effect of W on Microstructure and Impact Toughness of High Manganese Steel

The investigation was carried out to study the effect of tungsten addition(0-1.460%)on the microstructure and impact toughness of the high manganese steel by metallographic microscope,scanning electron microscopy,electronic probe and mechanical properties tests.The results indicate that with the increase of W content,the grain size of high manganese steel decreased,and the matrix hardness of high manganese steel increased.A small amount of carbides which contained a lot of W was precipitated on the matrix of high manganese steel;the impact toughness of high manganese steel first increased,then decreased,and reach the maximum 329.9 J/cm2 when W content was 0.912%,which increased by 49% compared with that of the high manganese steel without W.This is contributed to the combined action of solid solution strengthening,grain refinement strengthening and precipitation of carbides.