TC17钛合金线性摩擦焊工艺研究及显微组织分析  

Study on Linear Friction Welding Process and Microstructure Analysis of TC17 Titanium Alloy

作　　者：李菊 常川川 李晓红 陶军 张传臣 Li Ju;Chang Chuanchuan;Li Xiaohong;Tao Jun;Zhang Chuanchen(Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China;Beijing Friction Welding Technology and Equipment Engineering Center,Beijing 100024,China)

机构地区：[1]中国航空制造技术研究院航空焊接/连接技术航空科技重点实验室,北京100024 [2]北京市摩擦焊接工艺与装备工程中心,北京100024

出　　处：《稀有金属材料与工程》2022年第3期940-946,共7页Rare Metal Materials and Engineering

基　　金：国家科技重大专项(2017-Ⅶ-0005-0098);“高档数控机床与基础制造装备”科技重大专项(2018ZX04010001)。

摘　　要：采用不同焊接频率(20~50 Hz)、振幅(1~4 mm)、摩擦压力(32~96 MPa)对TC17(α+β锻)/TC17(β锻)钛合金进行线性摩擦焊试验研究,分析了不同焊接参数对钛合金线性摩擦焊接头质量的影响及接头不同区域显微组织演变规律。结果表明:热输入不足时,无法得到良好的焊接接头,其他焊接工艺参数不变时,随着单一参数的增加,热输入量迅速升高,焊接过程达到稳定状态,参数对焊接过程及接头质量的影响较小。TC17(α+β锻)/TC17(β锻)钛合金线性摩擦焊接头焊缝区域在焊接过程中发生了明显的相变及动态再结晶,形成亚稳定β相;两侧热力影响区由于受到热力耦合的作用,等轴及板条状α相沿着振动方向拉长,针状次生α相完全溶解。Linear friction welding behavior of TC17(α+β)/TC17(β)was investigated by several different processing conditions of frequency(20~50 Hz),amplitude(1~4 mm),friction pressure(32~96 MPa).The influences of different welding parameters on the quality of LFWed joints and the microstructure of different regions of joints were analyzed.The results show that when the heat input is insufficient,a good welding joint can not be obtained.When other welding parameters remain unchanged,with the increase of single parameter,the heat input increases rapidly,the welding process reaches a stable state,and the influences of parameters on the welding process and joint quality are small.It is observed that phase transition and dynamic recrystallization occur in the weld region during the welding process,and finally a metastableβphase forms after welding.The equiaxed and lathαphase are elongated along the vibration direction,and the intergranular needle-like secondaryαphase is completely dissolved in both sides of the thermo-mechanically affected zone because of undergoing thermal coupling.

关 键 词：TC17钛合金 线性摩擦焊 工艺参数 显微组织 

分 类 号：TG453[金属学及工艺—焊接] TG146.23[一般工业技术—材料科学与工程]