Mechanical Behavior Characterization of a Stainless Steel Dissimilar Metal Weld Interface : In-situ Micro-Tensile Testing on Carburized Martensite and Austenite

Abstract

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

“…In situ micro-mechanical experiments were carried out using a test apparatus specially developed at the MSSMAT laboratory [17] (Fig. 2).…”

“…This micro-test device, involving 3 piezo-electromechanical Phase Elastic modulus (GPa) Used Poisson coefficient ε [11] 203 0.32 ε [12] 123 0.31 ε [12] 165 0.31 γ' [13] 157 0.36 γ' [13] 159 0.36 γ' [14] 172 No indications actuators, allows a very accurate positioning while performing tensile as well as bending and compression tests. CentraleSupélec, CNRS) [17].…”

“…However, this experimental strategy implies complex compressive stress analysis which makes it difficult to compute intrinsic 𝐾 𝐼𝐶 tensile fracture toughness values. Hence, the purpose of this investigation is to propose an alternative micro-notch tensile test analysis [17] which, combined with DIC measurements, allows the decoupled estimation of the Young's modulus and the Poisson's ratio and more originally the computation of the tensile fracture toughness parameter of thin surface layers. This approach is applied to characterize a mixed 𝜀 − 𝛾′ 10 µm-thick compound layer obtained using a low pressure gaseous process applied on a 32CrMoV13 low-alloyed steel.…”