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In-situ effect of temperature on the mechanical properties of an Al-TRIP steel using the shear punch test
By Alexandre Birr, Rocco Varano, Abdelbaset Elwazri, François de Mestral, and
Al-TRIP steels, shear punch, mechanical properties, microstructure
An aluminium bearing transformation induced plasticity (TRIP) steel was investigated in this paper. The microstructure was characterized with respect to the retained austenite (RA) content using image analysis, Mössbauer spectroscopy and electron backscattered diffraction (EBSD) methods. These three characterizing techniques measured similar mass contents of RA ranging between 8 to 10 %. Shear punch testing was used to evaluate the mechanical properties at variable temperatures. Two TRIP heat treatments were investigated and five test temperatures for each treatment were conducted. Moreover, both heat treatments produced similar results even though the bainitic holding temperature was different. Different isothermal test tempera-tures revealed a change in the mechanical properties, in particular, a critical point for the formability was identified at around 373 K (100 °C).
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