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Local Elasto-Plastic Properties of Bearing Steels determined by Nano-Indentation Measurements Pages: 16 Published: Jan 2002
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View License Agreement Source: STP1419-EB Abstract Methods for obtaining local elasto-plastic properties of bearing steels through nano-indentation measurements are described. The usual way to analyze the unloading part of a nano-indentation test in order to obtain the elastic modulus of nonmetallic inclusions or primary carbides in bearing steels is summarized. Then, emphasis is given to a new method mat enables one to derive the profile of micro-plastic properties of a surface hardened bearing steel. Experimentally, it consists of measuring the residual displacement of a spherical indenter, following loading-unloading cycles at increasing maximal force . First, the direct problem, i.e., simulating by the finite element method the nano-indentation response, , from the knowledge of the strain-hardening law, , is studied. It is validated on steel specimens that are carburised homogeneously with different carbon concentrations. Second, the inverse problem, i.e. obtaining the strain-hardening law from the nano-indentation response, is studied on carburised and nitrided layers.
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