Division of character zones and elements distribution of Fe₃Al/Cr–Ni alloy fusion bonded joint

Authors: Ma, H. J.; Li, Y. J.; Li, J. N.; Wang, J.

Source: Materials Science and Technology, Volume 23, Number 7, July 2007 , pp. 799-802(4)

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Abstract:

A Fe₃Al/Cr–Ni alloy fusion bonded joint was divided into four character zones of a homogeneous mixture zone, a partial mixture zone, a partially fused zone and a heat affected zone. The microstructures, elements distribution and phase constitutions of the various character zones were analysed via metalloscope, SEM, electron probe microanalysis and X-ray diffraction. The results indicated that the microstructures were dissimilar in the different character zones. A 0·04–0·05 mm austenite rich band existed in the partial mixture zone. The diffusion of Fe, Al, Cr, Ni and C mainly occurred in fusion zone where Cr and Ni diffused into Fe₃Al to substitute some Fe on α ₁, α ₂, and β sublattices to form substitutional solid solution. The phase constitutions of Fe₃Al/Cr–Ni joint were Fe₃Al, γ-Fe, FeAl, NiAl, an unidentified Fe–C compound and an Fe–Cr–C compound (Cr₉Fe)₇C₃.

Keywords: CHARACTER ZONES; ELEMENTS DIFFUSION; PHASE CONSTITUTIONS; FE3AL/CR-NI ALLOY FUSION BONDED JOINT

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328407X176839

Publication date: 2007-07-01

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