SURFACE TREATMENT OF HARD ALLOY TOOL BY HIGH INTENSITY PULSED ION BEAMS
强流脉冲碳离子束强化T5K10刀具机理研究

Modification of hard alloy tools of T5K10 has been made by high intens ity pulse ion beams with various current density of 60 A/cm~2 , 100 A/cm~2 and 150 A/cm~2 respectively,with TIA-450 accelerator under the conditio ns of voltage 250 keV ,pulsed dur ation 80 ns and two pulse.By means of XRD,SEM?EDS and microhardness analyzin g it is revealed that asurface layer was fully remelted with current density 100 A/cm~2 and 150 A/cm~2 respectively.When irradiation with current density of 100 A/cm~2 ,surface microhardness increased to 1 25 times of that of the un-treated samples,but with 150 A/cm~2 ,the surface microhardness dose not further increase,as well as not induce farther changes of phase constituents.It is indicated that the quick s olidification of remelted surface layer results in a metastable microstroucture w ith refined greins,numerous gerain baundaries and defects etc.,which may then be responsible to the highe surface hardness.