Effect of microstructure on fatigue properties of WC-Co hard metals

Mechanical reliability of FIB-fabricated WC–Co cemented carbide nanowires evaluated by MEMS tensile testing

“…The size was 2.4 mm  4.5 mm  50 mm, which was made from a parent material of the NWs tested in this work. The mean Young's modulus was 550 GPa, which was comparable to the literature values [24]. Fig.…”

“…The NWs' apparent Young's moduli range from 83.2 GPa to 661 GPa, which vary widely within the sizes used here. The highest value is roughly comparable to the nominal value, 550-630 GPa, for WC [24], whereas the lowest value is approximately 40% of the nominal value, 210 GPa, for Co [25]. In addition to nanoscale tensile tests, we have conducted three-point bending tests for the millimeter-sized WC-Co specimens, although the results are not presented here.…”

Review on Microstructure Analysis of Metals and Alloys Using Image Analysis Techniques

“…Since the main objective was to isolate the dark and gray blobs based on their intensity levels, a background correction algorithm was performed to compensate for the inconsistent pixel intensity of the background. This minimized the possibility of dark and gray blobs being misidentified [4]. The microstructure of an engineering material depends on its properties.…”

“…The alloy precipitates present in the image are represented by the blobs which are fairly distinctly distinguished into two shades of gray -the white blobs which are the lighter ones and the darker or grey blobs. The objective is to identify the two types of blobs and statistically characterize them for comparison purposes [4].…”

“…Among the past years they have developed to improve hardness, bending strength and the fracture toughness. In order to design fatigue proof tools or structural components made of hard metals, mechanical and design engineers require material data like yield strength or fatigue strength [4].…”