压下率对冷轧及退火纯钛板材织构的影响

Effect of Reduction Rate on Texture of Cold Rolling and Annealing Pure Titanium Sheet

冷轧纯钛的典型织构类型是以{1123}<1010>为主要织构组分的棱锥织构。棱锥织构属于非对称织构,会使得纯钛板材呈现明显的力学性能各向异性。对纯钛板材进行多道次冷轧变形和再结晶退火处理,然后分别用X射线衍射仪(XRD)测试织构极密度及取向变化。结果表明:纯钛冷轧后主要存在的织构类型为(1213)<1010>、(0112)<2110>和(0111)<2110>棱锥织构。经580℃/2 h退火,遗传了冷轧后主要的棱锥织构类型,其中(0112)<2110>和(0111)<2110>织构的极密度随压下率变化较退火前明显减小,而基面织构虽然强度高但组分少,加剧了纯钛板材的各向异性。

For cold rolled pure titanium,the typical texture type is pyramid texture with{1123}<1010>as the main texture component.Pyramid texture belongs to asymmetric texture,which will make pure titanium sheet show obvious anisotropy of mechanical properties.In this paper,pure titanium sheet was subjected to multi pass cold rolling deformation and recrystallization annealing,and then the changes of texture polar density and orientation were measured by X-ray diffraction(XRD).The results show that the main texture types of pure titanium after cold rolling are(1213)<1010>,(0112)<2110>and(0111)<2110>pyramid texture.After annealing at 580℃for 2 hours,the main pyramid texture types after cold rolling are inherited.Among them(0112)<2110>and(0111)<2110>textures change less than those before annealing with the increase of reduction rates,while the basal texture though has high strength but only consists of few components,which aggravates the anisotropy of pure titanium.