Abstract
The effect of annealing temperature on microstructure and hardness of Ni-Co alloy coating electroplated on a Cr-Ni-Mo-V steel was investigated using the combination of micro-Vickers hardness tester, electron backscatter diffraction (EBSD) and energy dispersive spectrometer (EDS). It was found that the hardness of Ni-Co alloy coating drops suddenly at annealing temperature increased up to 350 °C, then gradually decreases with increasing annealing temperature. The microstructural characterizations suggested that the grains start to merge and grow in Ni-Co alloy coating at annealing temperature of 350 °C which leads to a decrease in the amount of grain boundaries, thus the initial dislocation density lowers when annealing temperature up to 650 °C. The formation of the Ni-Co oxidation was considered to be the second factor giving rise to the reduction in hardness with annealing temperature.
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