Ti-22Al-27Nb合金线性摩擦焊接头组织与显微硬度分析
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摘要
对Ti-22Al-27Nb合金进行了线性摩擦焊及热处理试验,并对热处理前后焊接接头的微观组织和显微硬度进行测量分析.结果表明,利用线性摩擦焊方法焊接Ti-22Al-27Nb合金得到的接头无焊接缺陷.焊态下,焊缝区形成了B2单相区组织.热力影响区为B2+O+α_2相三相区,出现等轴α_2相,针状O相几乎消失.热处理后在焊缝区析出板条状O相和针状O相,热力影响区为O相均匀分布的两相区.母材处的显微硬度值最低约为300 HV,随着向焊缝靠近,显微硬度值逐渐增加,焊缝中心达到最大值354 HV.热处理后,由于板条O相和针状O相的沉淀析出,使焊缝中心显微硬度急剧增加.
In this paper, the Ti-22 Al-27 Nb based alloy was welded by linear friction welding(LFW), and then subjected to post-weld heat treatment. The microstructure and the microhardness of the linear friction welded joints were investigated. The results showed that the sound joints free of defects can be obtained by using LFW method. As welded condition, the weld zone is mainly composed of metastable B2 phase. In thermo-mechanically affected zone, equiaxial α2 occurred in this zone and the acicular O phase nearly disappeared. After heat treatment, the lath O phase and acicular O phase precipitated at weld zone, the thermomechanically affected zone is a two-phase region with uniform distribution of O phase. The microhardness of base material is about 300 HV, the microhardness increases with approaching to weld center, which maximum microhardness is 354 HV.After heat treatment, the microhardness of the weld center increased sharply due to precipitation of lath O and acicular O phase.
In this paper, the Ti-22 Al-27 Nb based alloy was welded by linear friction welding(LFW), and then subjected to post-weld heat treatment. The microstructure and the microhardness of the linear friction welded joints were investigated. The results showed that the sound joints free of defects can be obtained by using LFW method. As welded condition, the weld zone is mainly composed of metastable B2 phase. In thermo-mechanically affected zone, equiaxial α2 occurred in this zone and the acicular O phase nearly disappeared. After heat treatment, the lath O phase and acicular O phase precipitated at weld zone, the thermomechanically affected zone is a two-phase region with uniform distribution of O phase. The microhardness of base material is about 300 HV, the microhardness increases with approaching to weld center, which maximum microhardness is 354 HV.After heat treatment, the microhardness of the weld center increased sharply due to precipitation of lath O and acicular O phase.
引文
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[4]李世琼,张建伟,程云君,等.Ti3Al和Ti2AlNb基金属间化合物结构材料研发现状[J].稀有金属材料与工程,2005,34(S3):104-109.Li Shiqiong,Zhang Jianwen,Cheng Yunjun,et al.Current status on development of Ti3Al and Ti2AlNb intermetallic structural materials[J].Rare Metal Materials and Engineering,2005,34(S3):104-109.
[5]Vairis A,Frost M.High frequency linear friction welding of a titanium alloy[J].Wear,1998,217(1):117-131.
[6]张田仓,李晶,季亚娟,等.TC4钛合金线性摩擦焊接头组织和力学性能[J].焊接学报,2010,31(2):53-56.Zhang Tianchang,Li Jing,Ji Yajuan,et al.Structure and mechanical properties of TC4 linear friction welding joint[J].Transactions of the China Welding Institution,2010,31(2):53-56.
[7]Zhao Pengkang,Fu Li,Zhang Tiancang,et al.Stress-strain characteristics of linear friction welding of TC11 and TC17 alloys[J].China Welding,2015,24(1):13-17.
[8]谭立军,姚泽坤,周伟,等.Ti-22Al-25Nb与TC11异种钛合金的线性摩擦焊接[J].塑性工程学报,2009,16(6):135-138.Tan Lijun,Yao Zekun,Zhou Wei,et al.Linear friction welding of dissimilar titanium alloys Ti-22Al-25Nb and TC11[J].Journal of Plasticity Engineering,2009,16(6):135-138.
[9]Biehlert C J,Majumdar B S,Seetharaman V,et al.Part1.The microstructural evolution in Ti-Al-Nb O+Bcc orthorhombic alloys[J].Metallurgical and Materials Transaction A(Physical Metallurgy and,Materials Science),1999,30(9):2305-2323.
[10]张传臣,黄继华,张田仓,等.异质钛合金线性摩擦焊接头微观组织与显微硬度分析[J].焊接学报,2012,33(4):97-100.Zhang Chuanchen,Huang Jihua,Zhang Tianchang,et al.Investigation on microstructure and microhardness of linear friction welded joints of dissimilar titanium alloys[J].Transactions of the China Welding Institution,2012,33(4):97-100.
[11]Li W Y,Ma T,Li J.Numerical simulation of linear friction welding of titanium alloy:effects of processing parameters[J].Materials&Design,2010,31(3):1497-1507.
[12]Zhang K,Ni L,Lei Z,et al.Microstructure and tensile properties of laser welded dissimilar Ti-22Al-27Nb and TA15 joints[J].International Journal of Advanced Manufacturing Technology,2016,87(5):1-8.