Ti-6Al-4V钛合金多工序加工的微观结构和力学性能研究（英文）

发布时间：2018-03-20 09:28

本文选题：Ti-Al-V合金　切入点：加工　出处：《稀有金属材料与工程》2015年04期 　论文类型：期刊论文

【摘要】：为获得环轧、胀形和热处理不同工艺组合状态下Ti-6Al-4V合金加工工艺-力学性能-微观组织之间的关系,分别对其α相和β相组织形貌,室温和高温拉伸性能(强度和塑性)进行观察与分析。研究表明,在适当的热处理工艺下,合金轧制成形之后增加第二工序胀形是很有必要的。材料的拉伸性能与初生α相的晶粒尺寸和体积分数,及次生α相的晶粒尺寸和组织厚度有很大关系。此外,胀形后热处理主要影响初生α相的晶粒尺寸及α相和β相组成比例,其次影响次生片状α相的大小和数量。当α相由小颗粒等轴组织转变为厚的多边形状组织时,材料的延伸率降低。随着初生α相体积分数的减少,未转变β相组织和弥散次生α相的增加,合金强度增加。材料高温拉伸断裂为韧性断裂,材料低塑性归因于组织断裂表面铸造微缺陷的萌生。
[Abstract]:In order to obtain the relationship between processing process, mechanical properties and microstructure of Ti-6Al-4V alloy under different combination of rolling, bulging and heat treatment, the morphology of 伪 phase and 尾 phase of Ti-6Al-4V alloy were studied. Tensile properties (strength and plasticity) at room and high temperatures were observed and analyzed. It is necessary to increase bulging in the second procedure after rolling. The tensile properties of the alloy are closely related to the grain size and volume fraction of the primary 伪 phase, and the grain size and microstructure thickness of the secondary 伪 phase. Post-bulging heat treatment mainly affects the grain size of primary 伪 phase and the proportion of 伪 phase to 尾 phase, and then affects the size and quantity of secondary lamellar 伪 phase. When 伪 phase changes from small particle equiaxial structure to thick multilateral shape structure, With the decrease of volume fraction of primary 伪 phase, the strength of alloy increases with the increase of untransformed 尾 phase structure and dispersion secondary 伪 phase, and the tensile fracture of the material at high temperature is ductile fracture. The low plasticity of the material is attributed to the initiation of microdefects on the fracture surface.
【作者单位】：西北工业大学凝固技术国家重点实验室;
【基金】：National Natural Science Foundation of China(51275414) Aeronautical Science Foundation of China(2011ZE53059)
【分类号】：TG146.23

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