Effects of interactive particles on steel weldability

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The concept of intragranular ferrite nucleation by specific inclusions is well known from steel weld metals. In this paper it is shown that the idea can be transferred to steel metallurgy. Control of the inclusion composition and thus the nucleation potency with respect to ferrite can readily be achieved by the choice of an appropriate deoxidation procedure. Thermodynamic (Thermo-Calc) calculations in addition to X-ray mappings and microprobe analysis are employed to understand and predict the inclusion formation in the steels. Three different steels, two of them Ti-deoxidized, and one Al-Ca-deoxidized, have been subjected to weld thermal simulation at different peak ... continued below

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6 p.

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Eijk, C. van der; Grong, O.; Babu, S.S. & David, S.A. November 1, 1998.

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Description

The concept of intragranular ferrite nucleation by specific inclusions is well known from steel weld metals. In this paper it is shown that the idea can be transferred to steel metallurgy. Control of the inclusion composition and thus the nucleation potency with respect to ferrite can readily be achieved by the choice of an appropriate deoxidation procedure. Thermodynamic (Thermo-Calc) calculations in addition to X-ray mappings and microprobe analysis are employed to understand and predict the inclusion formation in the steels. Three different steels, two of them Ti-deoxidized, and one Al-Ca-deoxidized, have been subjected to weld thermal simulation at different peak temperatures and cooling programs followed by Charpy-V notch testing at {minus}40 C to reveal differences in the HAZ toughness. The results from these tests show that the titanium deoxidized steels exhibit excellent toughness in the grain coarsened HAZ after high heat input weld simulation because of a refinement of the microstructure. This observation is in contrast to the more traditional behavior of the conventional Al-Ca deoxidized steels, which show no evidence of intragranular ferrite formation.

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6 p.

Notes

OSTI as DE99000379

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  • 5. international conference on trends in welding research, Pine Mountain, GA (United States), 1-5 Jun 1998

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  • Other: DE99000379
  • Report No.: ORNL/CP--99005
  • Report No.: CONF-980657--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/290923 | External Link
  • Office of Scientific & Technical Information Report Number: 290923
  • Archival Resource Key: ark:/67531/metadc687010

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  • November 1, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Jan. 25, 2016, 6:50 p.m.

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Eijk, C. van der; Grong, O.; Babu, S.S. & David, S.A. Effects of interactive particles on steel weldability, report, November 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc687010/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.