热处理对1种新型亚稳定β钛合金组织与性能的影响  

Effect of Heat Treatment on Microstructure and Mechanical Properties of a New Type Metastable Beta Titanium Alloy

作　　者：葛鹏[1] 赵永庆[2] 周廉[2] 

机构地区：[1]西安交通大学,陕西西安710049 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2004年第9期968-971,共4页Rare Metal Materials and Engineering

基　　金：总装预研项目(41312020306)

摘　　要：研究了1种新型的亚稳定β钛合金(Ti-B20)在不同热处理制度下的显微组织与拉伸和冲击性能.结果表明,热处理制度的改变能显著影响该合金的显微组织和强化行为.固溶温度是影响合金时效后塑性的首要因素,而时效温度是影响强度的主要原因.时效温度降低,析出相更加细小,因此合金强度升高.而粗大的晶粒及连续的晶界容易产生应力集中,因此合金经β固溶时效后具有较低的塑性和冲击值.通过在β相变点下固溶,然后在550℃-600℃之间合适的温度下时效处理,可以获得强度,塑性和冲击韧性的良好配合.The microstructure and tensite/impact properties of a new type metastable beta titanium alloy (insert composition here, Ti-B20) under different heat treatment conditions were studied. The results show that the variation of heat treatment conditions has a significant influence on the strengthening behavior of this alloy. Solution heat treatment temperature is the governs the ductility of alloy after aging; on the other hand, the aging temperature is important for controlling strength. The lower the aging temperature, the finer the precipitate, and the greater the strength of alloy. However, large grain size and continuous grain boundaries combine to produce stress concentrations, thus lowering the plasticity and impact value of alloy after beta solution and aging treatment. A good combination of strength-ductility and impact toughness can be achieved by solution treated below the beta transus temperature following by aging at appropriate temperatures in the range of 550degreesC to 600degreesC.

关 键 词：亚稳Β钛合金 热处理 显微组织 拉伸和冲击性能 

分 类 号：TG156[金属学及工艺—热处理]