TB5钛合金板材具有优良的冷成形性能,适于成形中等复杂的航空航天用板材零件,但存在板材定形性差、成形后回弹大等问题.本文以TB5钛合金板材的冷成形为背景,探讨了TB5钛合金板材组织在弯曲变形过程中的变形行为及其微结构和成形性能的演变规律.结果表明,随着板材弯曲角度的增大或弯曲半径的减小,板材弯曲回弹角与中心变形处晶粒面积和晶粒横纵比正相关;板材中心变形处硬度和中心变形处晶粒面积正相关,与中心变形处晶粒横纵比负相关.%Due to excellent cold formability,TB5 titanium alloy sheet is apply to forming moderately complicated spare parts of metal sheet for space flight and aviation,but it has such problems as poor setting,big spring-back after forming.In the paper,the evolution rules of the deformation behavior,microstructures and formabilities in the bending deformation were investigated for TB5 titanium alloy sheets.The results show that with the increasing of bending angles and decreasing of the bend radius of the sheet,the spring-back angle is positive correlation with the grain size and horizontal distanceand-vertical ratio of the grains.With the increasing of bending angles and decreasing of the bend radius of the sheet,the hardness at the center of deformation is positive correlation with the grain size,negative correlation with horizontal-vertical ratio of the grains at the center of deformation.
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