Abstract：W and MA956 steel were diffusion bonded by efficient Spark Plasma Sintering technique with a titanium interlayer at 950℃, 10MPa. After bonding, microhardness and shear strength test have been used to evaluate mechanical properties of the joint. Scanning electron microscope, energy disperse spectroscopy and X-ray diffraction were adopted to observe and analyze the microstructure and fracture characteristics of bonded joint. The results showed that Spark Plasma Sintering technique has successfully realized the reliable bonding of W/Ti/MA956 under the holding time of 10-30min. The W/Ti/MA956 joint consisted of W/Ti solid solution layer, Ti interlayer and the intermetallic layer between Ti/MA956 steel (FeTi、Fe2Ti and Cr2Ti). The highest microhardness is located at Ti/MA956 interface due to the formation of intermetallic compounds, and peak value of hardness is 580HV. With the increase of holding time (10 min, 20 min, 30 min), the average shear strength increased from 130.2MPa (10min) to 163.5MPa (20min) and then decreased to 125 MPa (30min). All the joints in shear testing fractured at the Ti/MA956 interface.
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2019, Vol. 26 