Experimental and Numerical Analysis of High-Cycle Fatigue Behavior of Steel Matrix Nanocomposites Reinforced by TiC/hBN Nanoparticles

다국어 초록 (Multilingual Abstract)

The majority of the product failure in industries is due to fatigue loadings. On the other hand, Nanocomposite materials area new group of materials, which are developed because of their enhanced mechanical properties. In this manuscript, metalmatrix nanocomposite samples (i.e. steel alloy 316L is considered as the matrix together with TiC and hBN nanoparticlesas the reinforcing particles) are produced using the powder metallurgy process. The reinforcing nanoparticles in 3.5 wt% foreach one are added to the matrix material. The samples are compacted in the pressure of 410 MPa and sintered in temperatureof 1375 °C for 3.5 h. Tensile testing is carried out on the samples to find the mechanical properties of the material andto compare with the corresponding properties of the pure steel. High-cycle fatigue tests are performed to derive the Stress-Cycle curve of the nanocomposite material. Subsequently, estimation of the fatigue life of nanocomposite gear is done, usingfinite element numerical simulations, and then the results are compared with the AGMA standard results. Experimental andnumerical results show improved mechanical properties of nanocomposite samples, compared to steel, as a result of theexistence of reinforcement nanoparticles.

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