Gas carburization and mechanical properties of radial composite tungsten alloy rods
The surface heat treatment of a radial composite tungsten alloy rod was carried out by gas carburization method,and a carburized layer with a certain thickness was obtained on the surface.The effects of carburizing temperature and time on the microstructure and mechanical properties of the alloy were studied by scanning electron microscopy,X-ray diffraction,nanoindentation,and room temperature static compression experiments.The results show that in the range of 1 150-1 250 ℃,with the increase of carburizing temperature and time,the thickness of carburized layer increases obviously,and WC phase is fully formed.When the carburizing temperature is 1 200 ℃ and the carburizing time is 3-5 h,the thickness of the carburized layer of the alloy can reach 70.5-94.1μm,and the Vickers hardness reaches 599.6-1 128.6.After carburization the radial composite tungsten alloy rod maintains good compressive toughness during compression at room temperature.When the carburized layer is thick,the outer material W70Cu undergoes obvious shear failure.
gas carburizationtungsten alloymicro structurestatic compressionshear failure
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