The effect of alloy composition and welding conditions on columnar-equiaxed transitions in ferritic stainless steel gas-tungsten arc welds View Full Text


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Article Info

DATE

1990-07

AUTHORS

J. C. Villafuerte, E. Pardo, H. W. Kerr

ABSTRACT

The columnar-equiaxed transition (CET) was investigated in full penetration gas-tungsten arc (GTA) welds on ferritic stainless steel plates containing different amounts of minor elements, such as titanium and aluminum, for a range of welding conditions. In general, the fraction of equiaxed grains increased, and the size of the equiaxed grains decreased with increasing titanium contents above 0.18 wt pct. At a given level of titanium, the equiaxed fraction increased, and the size of the equiaxed grains decreased with increased aluminum content. The CET was ascribed to heterogeneous nucleation of ferrite on Ti-rich cuboidal inclusions, since these inclusions were observed at the origin of equiaxed dendrites in the grain refined welds. Titanium-rich cuboidal inclusions, in turn, were found to contain Al-Ca-Mg-rich inclusions at their centers, consistent with observations by previous investigators for other processes. The welding conditions, in particular, the welding speed, were observed to affect the occurrence of the CET. Increasing the welding speed from 3 to 8 mm/s increased the equiaxed fraction noticeably, but a further increase in speed to 14 mm/s had a smaller additional effect. A finite element model (FEM) of heat transfer was used to examine the role of the welding conditions on the local solidification conditions along the weld pool edge. The results are compared with existing models for the CET. More... »

PAGES

2009

References to SciGraph publications

  • 1985-12. Distribution of the heat and current fluxes in gas tungsten arcs in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1981-09. Grain refinement in magnetically stirred GTA welds of aluminum alloys in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1980-08. Grain structures in aluminum alloy GTA welds in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1978-06. Asymmetrical solidification structures and fluid flow in GTA welds of 7004 aluminum alloy sheets in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1988-04. Welding parameters and the grain structure of weld metal — A thermodynamic consideration in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1970-07. The effect of carbide and nitride additions on the heterogeneous nucleation behavior of liquid iron in METALLURGICAL AND MATERIALS TRANSACTIONS B
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    http://scigraph.springernature.com/pub.10.1007/bf02647249

    DOI

    http://dx.doi.org/10.1007/bf02647249

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