材料期刊网

为了让Ti5553合金的强度和韧性等综合性能指标达到良好匹配，充分发挥其高强高韧的特点，提出了一种新的热加工方法。首先对Ti5553合金轧棒进行充分改锻，初步得到均匀、细小、无偏析、无β斑的基体组织，然后再利用β锻造形成一种细小密集的网篮组织，并在最后的β热处理过程中，生成β晶粒内的细小片状α转相和晶界处细小分散的α转相。结果表明：采用（Tβ-30）℃两相区改锻、（Tβ-30）℃预锻与（Tβ＋20）℃β锻造的联合模锻以及（ Tβ＋35）℃退火＋600℃时效的β热处理工艺后，可获得一种理想的β型钛合金组织，使该合金的强度、塑性和断裂韧性等综合性能指标都有所提高。

In order to improve the comprehensive performance including strength and toughness of Ti 5553 alloy, and give full play to its high strength and toughness characteristics , a novel thermal processing method was proposed .Rolled Ti5553 alloy bars were forged firstly , with the purpose of obtaining smaller , no segregation , no beta spot and uniform structure , and then formed the basket lattice structure through beta forging , after beta heat treatment process , smaller plate-like alpha transfer in beta grain size and small , scattered transfer alpha in grain boundary were generated .The re-sults show that the ideal beta structure of titanium alloy can be obtained , and the comprehensive performance of Ti 5553 alloy can be improved by the novel thermal process , which is forging in alpha +beta phase of (Tβ-30)℃firstly, and then die forging at (Tβ-30)℃and (Tβ+20)℃in turns, finally annealing at (Tβ+35)℃and aging at 600℃.