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Effects of microwave sintering on microstructure and mechanical properties of 93W-Ni-Fe alloy

LI Bo,SHANG Fujun,SHI Honggang(Ningbo Branch of China Academy of Ordnance Science,Ningbo 315103,China)  
The heating principle of microwave sintering(MS) is fundamentally different from that of conventional sintering(CS).This study introduced the new technology-MS on the basis of CS,probed the MS sintering technology of φ30 mm×110 mm 93W-Ni-Fe alloy ingots,and compared the effects of two heating modes on the hardness,grain size,microstructure and mechanical properties.The experiments show that the microwave sintered samples have even-distributed fine microstructure and tungsten particles are obviously smaller than that of CS.In terms of equally distributed radial property of MS,microwave heating can come up to the completely sintered depth of conventional size of tungsten alloy.It′s necessary to optimize the present microwave sintering technology because some defects of sintering still exist in the sintered samples.
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