η Phase Formation Mechanism at Cemented Carbide YG30/Steel 1045 Joints during Tungsten-Inert-Gas Arc Welding

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Cemented carbide YG30 and steel 1045 were welded with various Ni-Fe-C filling alloys via the Cemented carbide YG30 and steel 1045 were welded with various Ni-Fe-C filling alloys via the tungsten-inert-gas (TIG) arc welding. η phase formation at the welding joints was investigated via scanning electronic microscope (SEM), transmission electronic microscope (TEM) coupled with selected diffraction, and electron probe microanalysis methods. η phases in three different morphologies were identified and they appeared to form in different mechanisms. The η phase formed at the heat-affected zone (HAZ) exhibited a similar size to that of WC particles and its formation was mainly attributed to the inter diffusion among W, C and Fe, Co, Ni in solid-state γ phase. The large-size η phase near the interface between YG30 and weld bead was due to the coarsening of tiny η grains in the liquid weld bead. The small-size η phase was formed via precipitation from the γ phase during cooling. The η phase formation could be controlled by optimization of C and/or Ni concentration in the filling alloys.

Info:

Periodical:

Materials Science Forum (Volumes 675-677)

Edited by:

Yi Tan and Dongying Ju

Pages:

901-904

DOI:

10.4028/www.scientific.net/MSF.675-677.901

Citation:

X. J. Zhao et al., "η Phase Formation Mechanism at Cemented Carbide YG30/Steel 1045 Joints during Tungsten-Inert-Gas Arc Welding", Materials Science Forum, Vols. 675-677, pp. 901-904, 2011

Online since:

February 2011

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$38.00

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