(西北有色金属研究院,西安 710016)
摘 要: 对亚稳β高强钛合金Ti-1300管材挤压成形进行了研究,分析并测试了挤压管材在不同热处理制度下的组织及力学性能,并采用扫描电镜对拉伸试样断口形貌特征进行了观察。研究结果表明,Ti-1300亚稳β钛合金通过选择合适的挤压工艺参数可以制备出高质量管材,挤压态管材经860 ℃固溶处理后组织为完全β相单相组织,断口布满韧窝,具有较高的塑性,有利于进一步冷轧变形;560 ℃时效后为等轴β晶粒内弥散分布针状α相,断口为韧脆混合断口,强度可达1 310 MPa,伸长率为8%。
关键字: Ti-1300钛合金;挤压管材;显微组织;拉伸性能;热处理
(Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)
Abstract:The extrusion forming of metastable β high strength titanium alloy Ti-1300 tube was studied. The room-temperature tensile properties were tested and the microstructures of specimens were characterized. The fractographs of tensile specimens were observed by SEM. The results show that, the high quality extruded tubes of high strength titanium alloy Ti-1300 are manufactured with suitable parameters. The extruded tube after ST 860 ℃ consists of only β phases and has plastic dimple fracture surface. The ductility of raw extruded and solution state tubes is excellent, which is advantageous to deep deformation process. The extruded tubes of Ti-1300 alloy after aging treatment are composed of diffusion acicular α phase and β matrix and have plastic and brittle mixed fracture surface. Their strength reaches 1 310 MPa and the elongation is 8%.
Key words: Ti-1300 alloy; extruded tube; microstructure; tensile properties; heat treatment