This study introduces a novel contrast modality in neutron imaging, enabling the visualization of plastically deformed zones within ARMCO® iron. Utilizing differences in transmitted neutron intensity, we exploit variations in Bragg diffraction strength between deformed and non-deformed areas. Our findings reveal that deformed regions exhibit stronger diffraction due to extensive sub-grain divisions and angular spreading caused by plastic deformation. This contrast effect, attributed to extinction phenomena, is particularly evident in ARMCO® iron. We demonstrate the applicability of this technique through detailed 2D and 3D imaging of tensile and deep drawing samples. In tensile samples, the contrast effectively highlights regions of localized plastic deformation and Lüders band formation. For deep-drawing samples, the technique captures significant deformation patterns around the punch area and differentiates between the inner and outer surfaces of the sheet metal. The contrast modality is another step forward in fully exploiting and unraveling the rich information in transmission based neutron imaging and enables full-field characterization for samples up to tens of centimeters in size.