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Division and microstructure feature in the interface transition zone of Fe3Al/Q235 diffusion bonding
Yajiang Li1, Juan Wang, Yansheng Yin
1Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, China. yajli@sdu.edu.cn
Journal of Colloid and Interface Science
|June 2, 2005
Summary
The study investigated the Fe3Al/Q235 dissimilar material interface, revealing a complex transition zone. Increased heat and time widened this zone, coarsened microstructures, and altered microhardness and elemental distribution.
Area of Science:
- Materials Science
- Metallurgy
- Surface Engineering
Background:
- Understanding dissimilar material interfaces is crucial for advanced engineering applications.
- Fe3Al and Q235 steel are important materials in various industrial sectors.
- Characterizing the interface transition zone (ITZ) is key to predicting material performance.
Purpose of the Study:
- To analyze the microstructure and properties of the Fe3Al/Q235 dissimilar material interface.
- To investigate the effects of heat treatment on the interface transition zone.
- To understand the elemental distribution within the Fe3Al/Q235 ITZ.
Main Methods:
- Scanning Electron Microscopy (SEM) for microstructural analysis.
- Electron Probe Microscopy (EPM) for elemental composition mapping.
- Microhardness testing to evaluate mechanical properties across the interface.
Main Results:
- The Fe3Al/Q235 ITZ comprises a diffusion interface, mixed region, and side transition zones.
- Microstructural interlacing between base materials forms a layered characteristic.
- Wider ITZ and coarser microstructures observed with increased heating temperature and time.
- Microhardness decreased in the ITZ, peaking at the diffusion interface.
- Al, Fe, and Cr exhibited monotonic concentration changes with local fluctuations; Carbon remained stable.
Conclusions:
- The Fe3Al/Q235 interface exhibits a complex, layered microstructure influenced by processing parameters.
- Heat treatment significantly affects the ITZ width, microstructure, and microhardness.
- Elemental diffusion and segregation within the ITZ are critical factors determining interface integrity.