为获得环轧、胀形和热处理不同工艺组合状态下Ti-6A1-4V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.
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