锻造方式对Ti-6Al-4V合金组织及取向分布的影响

发布时间：2018-04-22 01:20

本文选题：钛合金 + 锻造　；参考：《工程科学学报》2015年03期

【摘要】：在快锻液压机上对Ti-6Al-4V合金进行了锻造变形,采用扫描电镜、背散射电子衍射技术以及X射线衍射技术研究了不同锻造方式下合金组织及晶粒取向的变化规律.在单向镦拔和换向镦拔两种不同锻造方式下,难变形区、小变形区及大变形区中α相及β相的分布差别不大,组织均匀性基本一致,两种变形方式下锻坯不同区域的应变稍有差别.进一步对不同变形区域形变织构的定量分析可知:在应变较小的边缘区域,变形主要以{0001}基面滑移为主,形成基面织构;在应变较大的内部区域,织构明显转向{112-0}、{101-0}等柱面织构;在应力集中的位置,会产生{112-2}、{101-1}等锥面织构.两种锻造方式均能提高Ti-6Al-4V合金中形变织构的均匀性,而且换向镦拔优于单向镦拔.
[Abstract]:The forging deformation of Ti-6Al-4V alloy was carried out on a rapid forging hydraulic press. The microstructure and grain orientation of the alloy under different forging conditions were studied by means of scanning electron microscopy, backscatter electron diffraction and X-ray diffraction. Under the two different forging modes of unidirectional upsetting and reverse upsetting, the distribution of 伪 phase and 尾 phase in the hard deformation region, small deformation zone and large deformation zone is not different, and the structure uniformity is basically the same. There is a slight difference in the strain between different regions of the forging under two deformation modes. Further quantitative analysis of deformation texture in different deformation regions shows that in the edge region with small strain, the deformation is mainly based on the slip of {0001} base plane, and in the inner region with larger strain, the texture obviously turns to {112-0}, {101-0} and other cylindrical textures. At the position of stress concentration, the conical texture of {112-2}, {101-1} is produced. Both forging methods can improve the uniformity of deformation texture in Ti-6Al-4V alloy, and the reverse upsetting is better than unidirectional upsetting.
【作者单位】：北京科技大学材料科学与工程学院;
【分类号】：TG146.23;TG319

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