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Fe₃Al/Q235 diffusion-bonded zone; vacuum diffusion bonding.

The chemical composition of the second phase precipitation in the vacuum diffusion-bonded zone of Fe₃Al intermetallic compound and Q235 carbon steel was analysed by means of electron probe microanalyser (EPMA). The relative content of the second phase precipitation and grain size was evaluated through a micro-image analyser. The percentage of Fe and Al content in the diffusion zone was measured by EPMA. The results indicated that the relative content of the second phase precipitation rich in carbon and chromium at the Fe₃Al/Q235 interface was much higher. With the transition from Fe₃Al intermetallic compound to Q235 carbon steel across Fe₃Al/Q235 interface, the grain diameter decreased from 250 𝜇m to 112 𝜇m, Al atom content decreased from 27% to 15%, while Fe atom content increased from 76% to 96%.

Wang Juan¹ Li Yajiang¹ Wu Huiqiang¹ Ren Jiangwei¹

1. Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, P.R. China

Manuscript received

1 July 2002

Manuscript revised

30 August 2002