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Article Dans Une Revue Surface and Coatings Technology Année : 2021

Micromechanical tensile test investigation to identify elastic and toughness properties of thin nitride compound layers

Résumé

The measurement of thin-layer mechanical properties, like compounds generated by thermo-chemical nitriding process, is a key issue to optimize and predict the endurance of surface treatment against contact fatigue and wear. An original FIB micro-tensile test strategy involving plain and micro-notched tensile specimens is proposed. These specimens were FIB machined in a thin ε(50%)- γ’(50%) compound layer resulting from a common low pressure gaseous nitriding process (Allnit ©) and tested using a dedicated micro-testing system. Combined with DIC analysis, such micro-tensile test strategy allows extracting both the elastic modulus and the Poisson's ratio. Additionally, testing micro-notched specimens underlines the necessity to include FE simulations in order to take into account the radius of the micro-notch tip as well as the surface roughness induced by the FIB machining process. The investigation of this ε - γ’ compound layer suggests a Young's modulus E = 200 GPa, a Poisson's ratio ν =0.31 and a rather low fracture toughness KIC = 0.55 MPa√m . This methodology involving FIB machining, DIC analysis, test procedures and FE post processing simulations is fully detailed and the given results are discussed regarding literature.
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Dates et versions

hal-03453518 , version 1 (29-11-2021)

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P. Arnaud, E. Heripre, F. Douit, V. Aubin, Siegfried Fouvry, et al.. Micromechanical tensile test investigation to identify elastic and toughness properties of thin nitride compound layers. Surface and Coatings Technology, 2021, 421, pp.127303. ⟨10.1016/j.surfcoat.2021.127303⟩. ⟨hal-03453518⟩
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