Effect of Layer Stacking Sequence on Deep Drawing Behavior of TA2/Q235B Composite Plates

The forming behavior of TA2/Q235B composite plates during deep drawing is influenced by significant material property differences and interfacial integrity, distinguishing it from monolithic plate forming. This study investigates the impact of layer stacking sequence on formability and interfacial damage through room-temperature deep drawing experiments, analyzing macroscopic topography, thickness distribution, drawing force, microhardness, and interfacial microstructure. Results show that when the Q235B side contacts the die, reduced friction and optimized stress distribution enhance formability, achieving a limiting drawing ratio (LDR) of 1.92 and a maximum thinning ratio (MTR) of 19.6%, superior to 1.83% and 18.1% with TA2-die contact. The fillet area, subjected to combined bending and radial tensile stresses, is most prone to failure, with microhardness peaking at the wall (152.45 HV) in unfractured samples and at the fillet (169.59 HV) in fractured ones. As the sample diameter increases from 90 mm to 115 mm, rising radial tensile stress and thinning exacerbate fillet stress, causing rupture when exceeding material strength. Interfacial analysis reveals horizontal cracks from normal tensile stress and vertical cracks in Q235B from radial tensile stress, aggravated by the decarburized layer. Fewer cracks in the transverse direction (TD) than in the rolling direction (RD) reflect the role of anisotropy in crack suppression. This research elucidates the impact of layer stacking sequence on both formability and microstructure-property relationships, providing valuable direction for enhancing composite manufacturing processes.