轧制工艺对TC4合金板材织构演变及组织和性能的影响

Effect of Rolling Process on Texture Evolution, Microstructure and Mechanical Properties of TC4 Alloy Plate

研究了顺向冷轧和换向冷轧2种轧制方式对TC4板材显微组织、织构和力学性能的影响。结果表明:2种轧制工艺的晶粒都有所细化;顺向冷轧微观组织仍存在带状组织,α晶粒呈现出方向性的拉长;换向冷轧晶粒破碎得更加均匀,退火后形成细小等轴α晶粒。换向冷轧板材的塑性显著优于顺向冷轧,强度略低于顺向冷轧,但是板材的RD和TD之间差值明显减小。原始冷轧板材主要存在(1210)<10 10>棱锥型织构,强度较高;顺向冷轧遗传了原始板材的织构组分;换向轧制促进(0001)的强基面织构向ND-TD面和RD-TD面发生漫射,并存在一定角度的偏转,有效降低棱锥型织构强度,促进织构组分重新分配,显著改善板材的各向异性。

The influence of two cold rolling processes of unidirectional rolling and cross rolling on the microstructure,texture and mechanical properties of TC4 alloy plate was studied.The results show that the grains of the two rolling processes are all refined.The microstructure of the unidirectional rolling still has a band structure,and the a grains are elongated along rolling direction.The micro structure of the cross rolling is a uniform composition of equiaxed a grains and intercrystalline β.The plasticity of the cross rolling plate is significantly better than that of the unidirectional rolling plate,and the strength is slightly lower than that of the unidirectional cold rolling plate.But the difference between the RD and TD directions of the plate is significantly reduced.The original cold-rolled plate mainly has(1210) <10 10> pyramid texture with strong intensity.Unidirectional cold rolling inherits the texture components of the original plate.Cross rolling promotes strong basal texture of(0001) to diffuse to the ND-TD surface and RD-TD surface,with a certain angle of deflection,which effectively decreases the pyramid texture intensity,promotes the redistribution of texture components and weakens the anisotropy of the plate.