热加工历史对Ti-24Al-15Nb-1.5Mo/TC11双合金盘焊接界面组织与性能的作用  

Action of Hot Working History on Microstructure and Properties of Welding Interface of Ti-24Al-15Nb-1.5Mo/TC11 Dual Alloy Disc

作　　者：刘莹莹[1,2] 姚泽坤[1] 杨航航[1] 秦春[1] 郭鸿镇[1] 

机构地区：[1]西北工业大学,陕西西安710072 [2]西安建筑科技大学,陕西西安710055

出　　处：《稀有金属材料与工程》2010年第2期362-366,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50775187)资助

摘　　要：采用电子束焊连接,随后近等温锻造+梯度热处理的工艺加工Ti-24Al-15Nb-1.5Mo/TC11双合金盘,通过OM、SEM、TEM、XRD等研究双合金盘的焊接界面状况。结果表明,经此工艺加工的Ti-24Al-15Nb-1.5Mo/TC11双合金盘的高温拉伸性能较优,焊缝的高温强度大于TC11钛合金,但室温拉伸性能分散度较大。采用梯度热处理不能消除经50%变形的双合金盘的焊缝到TC11侧热影响区的晶界α相。焊缝区簇状α2相的形成与在近等温锻造、梯度热处理加热保温过程中Al、Nb元素从α2相中分离出来有关。The Ti-24Al-15Nb-1.5Mo/TC11 dual alloy discs were joined by electron beam welding firstly, and then underwent near isothermal forging and gradient heat treatment. The welding interface state was investigated by OM, SEM, TEM and XRD. The results show that the elevated temperature properties of the dual alloy disc are better and the high temperature strength is larger than that of the TC11 alloy. However, the dispersion degree of tensile properties is larger at the room temperature. When the dual alloy disc is deformed by 50%, the a phase is distributed in the fl phase grain boundary from welding seam to the heat-affected zone of TC 11 alloy, which can not be eliminated by gradient heat treatment. The cluster a2 phase in the welding seam area is formed, which is ascribed to the diffusion of the A1 and Nb elements from the a2 phase during near isothermal forging and gradient heat treatment.

关 键 词：双合金盘 加工工艺 焊接界面 组织 性能 

分 类 号：TG407[金属学及工艺—焊接]