Mechanical and microstructural aspects of severe plastic deformation of austenitic steel

K Rodak, J Pawlicki, M Tkocz
2012 IOP Conference Series: Materials Science and Engineering  
Heat treatment of high manganese type X57MnAl27-5 austenitic steel M Jaboska, A miglewicz, G Niewielski et al. -Qualitative and quantitative description of microstructure of alloys from the Fe-Al system M Jaboska, M Mikukiewicz and A Tomaszewska -Microstructural evolution of metastable austenitic steel during high-pressure torsion and subsequent heat treatment S Chen, A Shibata, L J Zhao et al. -This content was downloaded from IP address 207.241.231.82 on 23/07 Abstract. The paper presents the
more » ... effects of severe plastic deformation by multiple compression in the orthogonal directions on the microstructure and the mechanical properties of austenitic steel. Several deformation variants were conducted with different number of passes. FEM simulations were performed in order to evaluate the actual values of the effective strain in the examined, central parts of the compressed samples. The deformed microstructure was investigated by means of the scanning transmission electron microscopy (STEM) and the scanning electron microscopy (SEM) supported by the electron back scattered diffraction (EBSD). X-ray phase analysis was performed to evaluate the martensite volume fraction. The mechanical properties were determined by means of the digital image correlation method and hardness testing. It is shown that the applied forming technique leads to strong grain refinement in the austenitic steel. Moreover, deformation induces the martensitic ' transformation. The microstructural changes cause an improvement in the strength properties. The material exhibits the ultimate tensile strength of 1560 MPa and the yield stress of 1500 MPa after reaching the effective strain of 10.
doi:10.1088/1757-899x/35/1/012008 fatcat:fkzii5hxlbditc5c2fnf4c6vya