Abstract
The effects of Cr and Mo contents on the properties of hot isostatic pressed (HIPed) materials with the compositions of Ni-X%Cr-Y%Mo-1.5%B (mass%) ((X,Y)=(10,36),(22,26),(34,16)) were investigated. Raw powders for these P/M materials were produced by gas atomization, followed by sieving less than 500 μm. The consolidation by HIP was carried out at 1423 K for 5 h under 147 MPa. Crystal structures and microstructures of these materials were investigated by X-ray diffraction analysis and scanning electron microscopy, respectively. Mechanical properties of Rockwell hardness and bending strength, corrosion resistance by immersion tests into various acid solutions and wear resistance by Ohgoshi-type abrasion test were also evaluated.Tetragonal M3B2 and M5B3 type complex borides were observed in the consolidated P/M materials. These complex borides with the size of approx. less than 5 μm were finely dispersed in Ni-based matrix. They showed Rockwell hardness from 40 to 50 HRC, which value increased with increasing Mo/Cr ratio, and bending strength comparable to that of P/M material with the composition of Co-1.6%C-30%Cr-8%W (ST-12). In addition, the present Ni-22%Cr-26%Mo-1.5%B P/M material with the most excellent mechanical properties revealed higher corrosion resistance than Ni-16%Cr-16%Mo-3.5%W-6.5%Fe (C-276) alloy and wear resistance comparable to ST-12.
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