红装<strong>TA2/Q345</strong>复合管扩散焊接头的性能

doi:10.11901/1005.3093.2024.308

材料研究学报

2025, Vol. 39

Issue (1): 35-43 DOI: 10.11901/1005.3093.2024.308

研究论文

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红装TA2/Q345复合管扩散焊接头的性能

牟春浩, 陈文革(

), 余田亮, 马江江

西安理工大学材料科学与工程学院西安 710048

Interface Microstructure and Properties of TA2/Q345 Composite Pipes Prepared by Hot Assembling and Diffusion Welding

MU Chunhao, CHEN Wenge(

), YU Tianliang, MA Jiangjiang

Xi'an University of Technology, School of Materials Science and Engineering, Xi'an 710048, China

引用本文:

牟春浩, 陈文革, 余田亮, 马江江. 红装TA2/Q345复合管扩散焊接头的性能[J]. 材料研究学报, 2025, 39(1): 35-43.
Chunhao MU, Wenge CHEN, Tianliang YU, Jiangjiang MA. Interface Microstructure and Properties of TA2/Q345 Composite Pipes Prepared by Hot Assembling and Diffusion Welding[J]. Chinese Journal of Materials Research, 2025, 39(1): 35-43.

全文: PDF(12041 KB) HTML

摘要:

采用红装和扩散焊工艺制备TA2/Q345钛钢复合管，研究了不同工艺的钛/钢复合管的界面组织和力学性能。结果表明，550 ℃红装钛钢复合管的结合强度为62.32 MPa，再经850 ℃/2 h或950 ℃/30 min扩散焊后结合强度分别提高到167.44 MPa和256.53 MPa。三种工艺的钛钢复合管中出现宽度为1.2 μm~40 μm的过渡层，其中主要是TiC、FeTi与Fe₂Ti。这些物相的形成促进了界面原子键合，使界面的结合强度提高。红装剪切断口的断裂形式为穿晶韧窝的韧性断裂，扩散焊剪切断口的断裂形式为准解理脆性断裂。红外探伤结果表明，复合界面中没有显著的缺陷。

关键词 ：金属材料, 钛/钢复合管, 红装, 扩散焊, 显微组织

Abstract：

To address the current issues of low interfacial bonding strength and complex process flow in titanium-steel composite pipes, herein, composite pipes of TA2 Ti-alloy/Q345 steel were fabricated via hot-assembling and diffusion welding technique. The microstructure and mechanical properties of the interface of TA2/Q345 composite pipes made by different processing conditions were investigated. The results show that the bonding strength of the TA2/Q345 composite pipes is 62.32 MPa after hot assembled at 550 °C. After subsequent diffusion welding at 850 °C for 2 hours or at 950 °C for 30 minutes, the bonding strengths rise up to 167.44 MPa and 256.53 MPa, respectively. Transition layers in between TA2 and Q345 ranging from 1.2 μm to 40 μm were observed under all the three making conditions, which mainly composed of TiC, FeTi, and Fe₂Ti. The formation of these phases promoted atomic bonding of the interface, enhancing bonding strength. The fracture mode of the shear fracture surface of the hot assembled composite pipe was ductile fracture with numerous transgranular dimples, while the fracture mode of the shear fracture surface of the diffusion welded composite pipe was quasi-cleavage brittle fracture. No significant defects were detected on the composite interface after infrared nondestructive test.

Key words： metallic materials titanium/steel composite pipe hot-assembled diffusion-welded microstructure

收稿日期: 2024-07-15

ZTFLH:

TG376.9

基金资助:陕西省重点研发项目(2023-YF-YBGY-1616);西安市硬科技项目(2024JH-CLYB-0034)

通讯作者: 陈文革，教授，wgchen001@263.net，研究方向为先进粉末冶金及复合材料

Corresponding author: CHEN Wenge, Tel: (029)82312383, E-mail: wgchen001@263.net

作者简介: 牟春浩，男，1998年生，硕士

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图1 Q345钢管和TA2钛管的基体组织

表1 TA2和Q345原料的化学成分

图2 钛钢复合管的制备流程

图3 钛钢复合管剪切实验试样的尺寸和实验装置

图4 TA2与Q345复合管界面处的OM照片

图5 红装和扩散焊后钛钢复合管界面处的SEM照片和EDS线扫描图

表2 红装和扩散焊后钛钢复合管界面处的EDS线扫描结果

图6 复合管钛侧和钢侧的XRD谱

图7 TiC、FeTi以及Fe2Ti不同温度的ΔG θ

图8 红装和扩散焊后TA2/Q345复合管的剪切强度和界面处硬度分布曲线

图9 TA2/Q345复合管剪切试验后钛侧和钢侧断口的形貌

图10 TA2和Q345复合管红装和扩散焊界面的红外探伤结果

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