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

被引:5
作者
Arnaud, P. [1 ]
Heripre, E. [1 ]
Douit, F. [1 ]
Aubin, V [1 ]
Fouvry, S. [2 ]
Guiheux, R. [3 ]
Branger, V [4 ]
Michel, G. [5 ]
机构
[1] Univ Paris Saclay, Lab Mecan Sols Struct & Mat, Cent Supelec, CNRS, F-91190 Gif Sur Yvette, France
[2] Ecole Cent Lyon, LTDS, Ecully, France
[3] SAFRAN Transmiss Syst, Colombes, France
[4] CESMAN, Naval Grp, Bouguenais, France
[5] IRT M2P, Metz, France
关键词
SEM-FIB; Micro-machining; In-situ micro-tensile test; FIB micro-notched test; KIC; ELECTRONIC-STRUCTURE; FRACTURE-TOUGHNESS; BEHAVIOR; STABILITY; STEEL; WEAR; NI; CO;
D O I
10.1016/j.surfcoat.2021.127303
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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 epsilon(50%)- gamma' (50%) compound layer resulting from a common low pressure gaseous nitriding process (Allnit (C)) 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 epsilon - gamma' compound layer suggests a Youngs modulus E = 200 GPa, a Poisson's ratio v =0.31 and a rather low fracture toughness KIC = 0.55 MPa root 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.
引用
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页数:11
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