多向镦拔对医用TC4钛合金组织和力学性能的影响
Effect of Multi-directional Forging on Microstructure and Mechanical Properties of Biomedical TC4 Alloy
樊亚军， 曹继敏， 王卫民， 陈志宏
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作者单位：（西安赛特金属材料开发有限公司，陕西 西安 710021）
中文关键字：医用TC4钛合金； 多向镦拔； 微观组织； 力学性能
英文关键字：biomedical TC4 alloy; multi-directional forging; microstructure; mechanical properties
中文摘要：通过实验对TC4方坯进行多向镦拔，对制备的径锻棒材进行组织和力学性能测试分析。结果表明：多向镦拔能有效细化TC4合金组织晶粒、提高力学性能。随镦拔变形量及次数的增加，α相晶粒逐渐细小、等轴化，2火次75%变形量多向镦拔可获得α相晶粒为5 μm；3火次75%变形量多向镦拔变形下，?准65 mm径锻棒的屈服强度及抗拉强度分别高达940 MPa和1015 MPa，伸长率为17%。
英文摘要：Multi-directional forging was applied to prepare TC4 alloy bar. The microstructure and mechanical properties of the TC4 alloy bar was tested. The results show that multi-directional forging can efficiently refine the grain size of the alloy and improve the mechanical properties. The finer and more equiaxed primary α is realized with the increase of deformation amount and times of multi-directional forging. And α grain size of 5 μm is obtained under 75% strain and 2 times heating. The TC4 alloy bar with ?准65 mm exhibits yield stength of 940 MPa, tensile strength of 1015 MPa and elongation of 17% under 75% strain and 3 times heating.