Microstructure and mechanical properties of diffusion bonded joints between titanium and low carbon steel with an iron interlayerChinese Full Text
LIU De-yi,YIN Qing-xue,LIU Shi-cheng(College of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China)
Abstract: Diffusion bonded joints of titanium/iron interlayer/low carbon steel were prepared by vacuum diffusion welding.Microstructure and properties of the interfaces were examined by means of OM,SEM,EDS,XRD,microhardness and tensile tests.The results show that the interdiffusion of Fe and Ti atoms across the interface results in formation of α-β Ti + α-Ti or β-Ti + α-β Ti + α-Ti microstructure in the side of titanium,and the columnar grains form in iron interlayer and decarburation occurs in steel side,respectively,under the bonding condition of 900 to 1050 ℃ for 30 min.Tensile strength of the joint increases first and then decreases with increase of diffusion temperature and the maximum tensile strength of 260 MPa is achievesd under bonding condition of 900 ℃ for 30 min.The tensile fracture surface shows rough,brittle and second fracture zones and the phases of TiC,FeTi and Fe2Ti are detected on the fracture by XRD.
- DOI：
10.13289/j.issn.1009-6264.2012.07.011
- Series：
- Subject：
- Classification Code：
TG174.44
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