摘要
研究了不同热处理制度对TA15钛合金显微组织和性能的影响。结果表明:两相区热处理时,获得了双态和等轴组织;β相区热处理,获得了魏氏组织,冷却速率决定了α片层和α集束的尺寸。魏氏组织的拉伸强度水平与双态/轴组织相当,断裂韧度较高,疲劳裂纹扩展速率较低,塑性有所降低。β相区空冷所得魏氏组织,具有中等强度水平,但断裂韧度较高,抗疲劳裂纹扩展性能最好。
The effects of heat-treatment on microstructure and properties of TA15 alloy were studied. The results show that the Widmanstaten microstructure formed by heating TA15 alloy in β phase region exhibits similar strength, higher fracture toughness and fatigue crack propagation resistance, compared with that of the equiaxed a and （α ＋ β） TA15 alloy formed by heating the alloy in α ＋ β phase region and then cooling using different cooling rate. The width of α lamellae and α colonies depends on the cooling rate. The TA15 alloy with Widmanstaten microstructure obtained by heating it in β phase region and then cooling in air exhibits middle tensile strength, higher fracture toughness and fatigue crack propagation resistance.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2008年第6期82-85,共4页
Transactions of Materials and Heat Treatment
作者简介
李士凯（1978-），男，洛阳船舶材料研究所，博士，从事钛合金研究，电话：0379-67256041，E-mail：LSK786150@163．com。
