长时间热暴露对Ti-24Al-15Nb-1Mo合金组织和性能的影响  

Effects of Thermal Exposure on Microstructures and Tensile Properties of Ti-24Al-15Nb-1Mo Alloy

作　　者：周黔[1] 罗倩[1] 赵鹏[1] 朱郎平[1] 南海[1] 李建崇[1] 

机构地区：[1]中航工业北京航空材料研究院,北京100095

出　　处：《钛工业进展》2016年第3期30-33,共4页Titanium Industry Progress

摘　　要：采用熔模精密铸造及热等静压技术制备Ti-24Al-15Nb-1Mo合金模拟件,然后在600、650、700℃大气氛围下,经过100、300、500 h热暴露,取样研究其微观组织和室温拉伸性能的变化。结果表明,在热暴露过程中,Ti-24Al-15Nb-1Mo合金的非平衡组织逐渐向平衡态转变,导致自身组织分解、析出、粗化等一系列的转变,从而对合金的力学性能产生较大影响。经热暴露后,其抗拉强度从863 MPa下降到最低742.7 MPa,塑性也有所下降,延伸率相对热等静压态的最大下降量为56%。Investment casting technology was adopted to prepare Ti-24Al-15Nb-lMo alloy. With prolong thermal exposure of 100, 300, 500 hours in 600, 650, 700℃ air atmosphere, the changes in microstructures and room temperature tensile strength were studied. The results show that the unbalanced microstructures turn to balanced and then get decomposition, precipitation and coarsen during thermal exposure. Thus, the microstructures have great influence on the mechanical properties of the alloy. After the thermal exposure, tensile strength decreases from 863 MPa to 742.7 MPa, ductility reduced by 56% compared with it after hot isostatic pressing.

关 键 词：Ti-24Al-15Nb-1Mo合金 热暴露 微观组织 拉伸性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]