TC6钛合金棒材热处理工艺研究

Study of heat treatment processings of TC6 titanium alloy bars

对TC6钛合金φ20mm～φ120mm不同规格棒材进行了普通退火、双重退火、等温退火、固溶时效等热处理方法和热处理制度研究,并对比分析了热处理制度和组织、性能之间的影响关系,结果表明,TC6钛合金的组织和性能对热处理工艺敏感,应根据半成品规格、类型、截面形状、使用温度、受力情况以及设备条件等诸多因素选择合适的热处理方法和制度,才能达到强度、塑性和韧性的最佳匹配。研究结果证实普通退火是一种简单易行的退火制度,适用于飞机结构用中等规格棒材等半成品的退火,进一步提出了TC6钛合金棒材的热处理工艺选择原则。

A stady of the heat treatment of TC6 Titanium alloy bars have been conducted. The bars of the alloy with the diameter ranging from 20mm to 120mm have undergone the conventional annealing, dual annealing, and isothermal annealing and the relationships among heat treatment, microstructure and property have been analyzed. The result shows that the microstrueture and properties of TC6 Titanium alloy are sensitive to its heat treatment processing and thus the optimum heat treatment method should be chosen to achieve to the perfect combination of strength, plasticity, and toughness according to the specification, type, shape of cross section, operating temperature, condition of stress of semi-products and equipments available. It is proved that conventional annealing is a feasible way for the annealing of seml-products used in aircraft structure, such as bars et al. The principles for the selection of heat treatment methods of TC6 Titanium alloy bars are also presented for reference of research and manufacture.