Estimation of Single-grain Properties of Steel through Inverse- engineering of Microindentation Experiments: Uniqueness of the Solution

• DOI: 10.1016/j.mspro.2014.06.038
• Publication Date: 2014-06-27T09:33:28Z
• Authors: Lisa Tang; Carey L. Walters
• Keywords: Hardening (computing); Maxima and minima; Indentation; Inverse method

Cleavage fracture of steel is governed by micromechanical mechanisms, but it modelled with simple continuum- level models. These models are starting to reach the limits their applicability, so there interest look deeper into modelling processes. In order model on microstructural level, a plasticity grains themselves needed. prior studies, method finding single-crystal properties an inverse engineering approach has been described. By this method, single crystal indented, and material input FE experiment iteratively changed until agreement achieved. studies have shown that methods like provide ambiguous results. paper, uniqueness solution assessed evaluating difference between experiments simulations for variety parameters. The results show power law hardening relationship, martensite produces two unique minima (at n=0 0.1). This may represent Lüder's plateau subsequent hardening, respectively. ferrite featured minimum was flat, flatness over very short range exponents.