【摘要】 通过室温拉伸测试和显微组织观察,研究了挤压温度和热处理工艺对Ti-1300钛合金挤压管材显微组织和力学性能的影响,讨论了热加工工艺、显微组织和力学性能之间的关系。结果表明:Ti-1300钛合金在两相区挤压后的横向组织均匀细小,纵向组织沿挤压加工流线破碎均匀;其拉伸强度高达1 445 MPa。管材在相变点以上的高温固溶组织主要由等轴β相晶粒组成,具有较好的塑性。合金两相区挤压后具有较好的强度和塑性的匹配,两相区挤压的塑性明显优于β单相区挤压,尤其面缩。试样经过固溶时效处理后显微组织明显细化,强度大幅度提高,可达1 300 MPa以上。更多还原

【Abstract】 The effects of extrusion temperature and heat treatment process on the microstructures and mechanical properties of Ti-1300 titanium alloy tube billet were studied by tensile testing and microstructure observation. The relationships among the thermal processing technique, microstructures and mechanical properties were discussed. The results show that Ti-1300 titanium alloy after extruding at two-phase region exhibits homogeneous and fine transverse structures and uniform crushed extrusion processing streamline observed in longitudinal structures. The tensile strength is up to 1 445 MPa. The structure of the tube obtained by high temperature solid solution above the phase transition point is mainly composed of equiaxed β phase grains with good plasticity. The two-phase extruded alloy shows good match of strength and plasticity. The plasticity of the two-phase extruded alloy is obviously greater than that of the single-phase extruded one, especially in section contraction. The microstructures of the specimen are refined obviously after solution and aging treatment, and the strength is greatly improved and reaches more than 1 300 MPa.更多还原