BSDSEM图像被带离了厚度截面和轧制方向是什么水平。
4.摘要和结论
热镦锻期间的组织演化和热叠轧是追究OBCCTiAlNb合金。且研究意义在Ti25Al25Nb,Ti23Al27Nb,Ti12Al38Nb的合金名义上。前两个是接近分组Ti2AlNb 合金。小锭被用来理解影响轧制预热处理对轧制状态的Ti25Al25Nb结构。最大的粮食大小、氧回升、表面a2降水和表面边裂被展示供超级transus预热工作表。每个大的铸件是加工单在温度在932-1000°C。热锻程序启动的故障大事先密件抄送谷粒的锭,同时热包轧制进一步减少晶粒尺寸。这个Ti12Al38Nb合金是最容易变形,预计将导致两个主要因素:(一)的流动应力的Ti2AlNb附近OBCC合金显著高于完全b Ti12Al38Nb;(二)完全b Ti12Al38Nb微观结构具有良好的延性[19、26)和处理高于btransus,而近Ti2AlNb合金在sub-transus处理温度。 下面列出了这项工作的结论。
1.
所需的微观结构停产是强烈依赖于处理和热处理日程安排。均匀,细粒度
(d4mm)附近的Ti2AlNb合金微观结构通过sub-transus生产加工,导致中断下来事先密件抄送退耕还林边界和类似于血小板的形态。微观结构包含大事先密件抄送谷物当制作了超级transus加工热处理使用温度了。它被结论是细粒度的微观结构可能只工作执行下面的transus。
2.
Super-transus锻造、轧制生产的Ti12Al38Nb中间晶粒大小(d30毫
米)fullyb微观结构。由于优良的延展性和低产量低铝b阶段的应力这种材料表现出更好的可加工性比OBCC合金Ti2AlNb附近。
3.
密件抄送阶段不会在subtransus期间不重新结晶热锻和热连轧。再结晶更大的Al内容和O相体积分数导致更大的锻件和轧制加载所需的平等变
的缺乏会导致密件抄送柱状的微观结构。
4.
形。Ti25Al25Nb需要减少锻造比均匀Ti23Al27Nb高度变形,这表明在变形热诱导软化行为与增加铝含量和相对较高的Ophase体积分数的差异。 鸣谢
这项研究是在赖特-帕特森上执行空军研究实验室材料及制造根据空军首长级合同F33615-91-C-5663和F33615C965258UES公司向作者是特别感谢医生Seetharaman为提供技术指导和人学士，马宗达Drs奇迹和S.L.Semiatin有益讨论的J.和T.布朗、T.琼斯和T.戈的援助UES有限公司从事雪茄熔化、锻造、和衷心感谢轧制实验。的作者还要感谢支持从约翰·霍普金斯大学期间收到写的这份手稿。
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