PRECIPITATE AT DIFFUSION-BONDED INTERFACE BETWEEN Fe3Al ALLOY AND STEEL Q235

Acta Metall Sin

2005, Vol. 41

Issue (9): 989-993 DOI:

Research Articles

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PRECIPITATE AT DIFFUSION-BONDED INTERFACE BETWEEN Fe3Al ALLOY AND STEEL Q235

WANG Juan; LI Yajiang; MA Haijun

Key Laboratory of Liquid Structure and Heredity of Materials; Ministry of Education;Shandong University; Jinan 250061

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WANG Juan; LI Yajiang; MA Haijun. PRECIPITATE AT DIFFUSION-BONDED INTERFACE BETWEEN Fe3Al ALLOY AND STEEL Q235. Acta Metall Sin, 2005, 41(9): 989-993 .

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Abstract Morphology, structure and chemical composition of the precipitate at Fe3Al/Q235 diffusion-bonded interface were studied by means of scanning electron microscope (SEM), energy dispersive spectrum (EDS), X-ray diffractometer (XRD) and electron probe micro-analysis (EPMA). The formation of the precipitate and the effect of technological parameters on the precipitate were also investigated. The results indicate that FeAl(Cr) was formed in the Fe3Al side of the Fe3Al/Q235 diffusion-bonded interface, which is the key to cause brittle fracture of the Fe3Al/Q235 bonded joint. The relation between the formation and growth of FeAl(Cr) and bonding parameters obeys the parabolic law, y2=3.5 (t-t0）exp[-5.6 ×10 4/(RT)]. So in order to avoid the formation of the precipitate and to ensure the performance of the Fe3Al/Q235 bonded joint, it is necessary to increase pressure for accelerating the atom diffusion at the interface with lower heating temperature and shorter bonding time.

Key words: Fe3Al alloy steel Q235 diffusion bonding

Received: 18 January 2005

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