Microstructural evolution during uniaxial tension-compression in-plane deformation of an IF steel

Mechanical, microstructural and in-situ neutron diffraction investigations of equi-biaxial Bauschinger effects in an interstitial-free DC06 steel

“…The DC06 steel serves as a simple reference material because the low amount of alloying elements allows to exclude additional effects associated with impurities or the formation of precipitates (Jeong et al, 2015). In a previous study (Härtel et al, 2019), we microstructurally characterized the initial material condition; TEM analysis indicated that the as-received sheet material exhibits a low dislocation density. Dislocation density measurements based on EBSD data confirmed a relatively low value of 6 ⋅ 10 12 m − 2 (Härtel et al, 2019).…”

“…In a previous study (Härtel et al, 2019), we microstructurally characterized the initial material condition; TEM analysis indicated that the as-received sheet material exhibits a low dislocation density. Dislocation density measurements based on EBSD data confirmed a relatively low value of 6 ⋅ 10 12 m − 2 (Härtel et al, 2019).…”

“…An interstitial-free DC06 steel sheet (0.02 wt.-% C, 0.25 wt.-% Mn and 0.3 wt.-% Ti and Nb) with a thickness of 1 mm was used in this study. Its mechanical behavior has already been characterized in some detail, (Clausmeyer et al, 2013;Güner et al, 2013;Härtel et al, 2019Härtel et al, , 2016Yin et al, 2014). The DC06 steel serves as a simple reference material because the low amount of alloying elements allows to exclude additional effects associated with impurities or the formation of precipitates (Jeong et al, 2015).…”

“…For microstructural analysis of the equi-biaxial Bauschinger effect in DC06, samples for electron microscopy and XRD were investigated at different stages of plastic deformation. Comparable to the pioneering work of Hasegawa et al (1975) and our own recent study (Härtel et al, 2019), the first set of samples was taken from the cruciform specimens after unloading from different maximum tensile strains (0.5 % and 2.0 %); a second set of samples was taken immediately after the load reversal (yielding under biaxial compression); a final set was analyzed after plastic strains of about 3.5 % in equi-biaxial compression.…”

“…The present work builds on, and adds to, a previous study (Härtel et al, 2019) where Bauschinger effects in uniaxially deformed sheet metals of an interstitial-free (IF) DC06 steel were investigated both mechanically and microstructurally. Focus is now shifted from uniaxial loading to equi-biaxial tension-compression testing.…”