期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 31, 期 9, 页码 962-968出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2014.09.021
关键词
Dissimilar metal joining; Friction welding; Titanium; Steel; Post-weld heat treatment; Intermetallic
资金
- National Natural Science Foundation of China [51374048]
- National Basic Research Program of China (973 Program) [2011CB013402]
- Fundamental Research Funds for the Central Universities [DUT13ZD209]
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, China [AWJ-M14-06]
Dissimilar metal joining of Ti-6Al-4V (TC4) titanium alloy to as-rolled 40Cr steel rods was conducted with friction welding, and the effect of post-weld heat treatment (PWHT) on the microstructure and mechanical properties of the resultant joints was investigated. The average tensile strength of the as-welded joints reached 766 MPa and failure occurred in 40Cr steel base metal. However, after PWHT at 600 degrees C for 0.5, 1, 2 and 3 h, the tensile strength of the joints decreased and fracture happened through the interface with quasi-cleavage features. The bending angle of specimens was improved from 9.6 degrees in as-welded state to 32.5 degrees after PWHT for 2 h. The tensile strength of the joint was enhanced by martensitic transformation near the interface in as-welded state. Sorbite formed near the interface in PWHT state and improved the bending ductility of the joint. TiC brittle phase formed at the interface after PWHT for 0.5 h and deteriorated the tensile strength and bending ductility of the joint. After PWHT for 2 h, no TiC phase was detected at the interface. The microhardness on the interface in as-welded state was higher than that after PWHT, indicating that the decrease of microhardness around the interface could be accompanied by degradation of tensile strength but improvement of bending ductility of the joints. Copyright (C) 2015, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited. All rights reserved.
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