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Ultra-fine grained WC–Co composites possess higher hardness or strength and wear resistance, compared to their coarse counterparts. However, abnormal grain growth of ultra-fine WC particles often occurs during the traditional pressureless liquid sintering, which substantially impairs the mechanical properties and erosion resistance of the material. Thus, controlling the abnormal grain growth becomes...
The sub-zero treatment can improve mechanical properties and wear resistance of many metallic materials and the improvement is largely affected by the sub-zero treatment condition. In this study, samples of W9Mo3Cr4V (W9) high speed steel (HSS) were treated at various sub-zero temperatures before and after tempering, respectively. The main objective of this work is to investigate the effect of the...
This paper reports our recent studies on the tribological behavior and related properties of a nano-crystalline surface of 304 stainless steel (304SS) produced by a sandblasting and annealing process. The grain size of the nano-crystalline surface layer was in the range of 20nm, determined using transmission electron microscopy (TEM). Mechanical behavior, electrochemical properties, electron work...
This paper reports our recent studies on nanocrystalline surface layer of 304 stainless steel (304SS) produced using a sandblasting and annealing process. The grain size of the sandblasted surface layer was less than 20 nm. Mechanical and electrochemical properties of the nanocrystalline surface and its passive film were investigated using nano/micro/-indentation, micro-scratch, scanning Kelvin probe...
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