Abstract
This paper presents the effect of deposited graphene oxide coating on fatigue life of austenitic steel 1.4541 at 20 °C, 100 °C, and 200 °C. The study showed a decrease in the fatigue life of samples with a deposited graphene oxide layer in comparison with reference samples at 20 °C and 100 °C. However, an increase in fatigue life of samples with a deposited graphene oxide layer in comparison with reference samples occurred at 200 °C. This relationship was observed for the nominal stress amplitude of 370 and 420 MPa. Measurements of temperature during the tensile failure of the sample and microfractographic analysis of fatigue fractures were performed. Tests have shown that graphene oxide deposited on the steel surface provides an insulating layer. A higher temperature of the samples with a deposited graphene oxide layer was observed during fracture compared to the reference samples.
Highlights
Improvements in mechanical properties after the addition of graphene or its derivatives to composites have resulted from many research projects [1,2,3,4]
Materials and Methods Static tension tests and fatigue life tests were performed on flat paddle specimens of 5 mm thickness made of 1.4541 steel according to the following designations: BM—base material (Section 2.1), and BM + GO—base material with a deposited graphene oxide layer (Sections 2.1–2.3)
The analysis of the surface morphology of BM (Figure 4a) and BM + GO (Figure 4b) samples showed that graphene oxide flakes fill and smooth the structural notches, i.e., cracks formed during the sheet rolling process
Summary
Improvements in mechanical properties after the addition of graphene or its derivatives to composites have resulted from many research projects [1,2,3,4]. The results of fatigue life studies presented in work by Demir et al [2], Rafiee et al [3], and Li et al [4], among others, have shown that a small addition of graphene or its derivatives in the volume of a composite results in an improvement in its mechanical properties. Yavari et al [5] showed that addition of graphene caused a ~3–5-fold increase in the fatigue life of fiberglass/epoxy composites. Najfi et al [6] conducted an analysis of the effect of graphene oxide functional groups on fatigue strength. The addition of ether groups resulted in delayed crack growth and increased fatigue strength [6]
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