Effect of Heat Treatment on Microstructure and Properties of Titanium Alloy Castings in Physical Tensile at Room Temperature

本研究系统探讨了热处理对物理常温拉伸钛合金铸件的组织演变与力学性能的影响。在对钛合金的相变机制进行深入分析的基础上，首次采用固溶处理及时效处理相结合的工艺，对不同处理参数(包括温度与时间)下的样本进行了全面的微观组织观察与拉伸性能测试。通过扫描电子显微镜(SEM)与透射电子显微镜(TEM)对微观组织特征进行精确表征，发现热处理显著提升了β相与α相的均匀分布，微观晶粒细化并促进了强化相的析出，这直接导致拉伸强度与延展性的协同优化。研究结果表明，在适宜处理温度下，钛合金的拉伸强度可以提高了约20%，而延伸率也有相应提升。通过对不同参数下的拉伸性能与组织结构关系进行量化分析，明确了硬度、强度与韧性之间的微观机制，也为钛合金材料在航空航天及汽车工业等领域的应用提供了理论依据与实践指导。这些发现不仅推动了钛合金热处理技术的发展，同时也为多元合金材料的优化设计奠定了基础。In this study, the effects of heat treatment on the microstructure evolution and mechanical properties of physical tensile titanium alloy castings were systematically investigated. Based on the in-depth analysis of the phase transition mechanism of titanium alloys, the microstructure and tensile properties of the samples under different treatment parameters (including temperature and time) were observed by the combination of solution treatment and aging treatment for the first time. By scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the microstructure characteristics were accurately characterized. It was found that heat treatment significantly improved the uniform distribution of β and α phases, refined the microscopic grains and promoted the precipitation of the strengthened phase, which directly led to the co-optimization of tensile strength and ductility. The results show that the tensile strength of titanium alloy can be increased by about 20% and the elongation is also increased at the appropriate temperature. Through the quantitative analysis of the relationship between tensile properties and microstructure under different parameters, the microscopic mechanism between hardness, strength and toughness was clarified, and the theoretical basis and practical guidance were provided for the application of titanium alloy materials in aerospace and automotive industry. These findings not only promote the development of titanium alloy heat treatment technology, but also lay a foundation for the optimal design of multicomponent alloy materials.