Abstract
In this study, a miniaturized cruciform-shaped sample geometry which allows reaching high plastic strain under equibiaxial loading with reduced thickness at the test section is presented. The thinning method results in excellent surface quality that can be used for electron backscatter diffraction (EBSD) and high-resolution digital image correlation (HRDIC) investigations. The new cruciform geometry is used to study the slip activity in metastable austenitic stainless steel 304 during uniaxial and equibiaxial deformation using HRDIC. The results are discussed with respect to the Schmid law and the effect of multiple slip activity on the nucleation of martensitic transformations.
Highlights
Metals and alloys are subjected to biaxial stresses and strain path changes during sheet forming, drawing processes and under service conditions
We present an optimized cruciform shape geometry which enables performing in-situ scanning electron microscopes (SEMs) biaxial tests coupled with high-resolution digital image correlation (HRDIC) analysis
The good match between simulation and experiment allows using the FE simulation for estimating the stress values at the center of the cruciform shaped specimens under the different loading conditions. This is known to be non-trivial as cruciform samples do not possess a well-defined cross-section as compared to uniaxial dogbone samples [10]
Summary
Metals and alloys are subjected to biaxial stresses and strain path changes during sheet forming, drawing processes and under service conditions. Under these complex loading conditions, the deformation behavior and the mechanical properties can differ from those obtained under uniaxial loading conditions [1, 2]. Other deformation mechanisms such as twinning and/or deformation-induced phase transformations occur e.g. in transformation induced plasticity (TRIP) steels [1, 4,5,6,7,8,9] Since these mechanisms depend on materials parameters and on the resolved shear stress, their activation depends on the strain path
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
