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Microstructural modification of austenitic stainless steels by rapid solidification

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Abstract

The microstructural modifications in three austenitic stainless steels (types 308, 310, and 312) were evaluated after rapid solidification. These three steels are commonly used weld filler metals. Two methods of rapid solidification were investigated, autogenous laser welding and arc-hammer splat quenching. The structure of 310 stainless steel was found to be 100 pct austenite, and did not vary over the range of conditions studied. On the contrary, the structures of types 308 and 312 steels were very sensitive to the cooling rates and solidification conditions. With the highest cooling rates, the type 308 structure was fully austenitic while the type 312 structure was fully ferritic. At lower cooling rates, the structures were duplex ferrite plus austenite. The results were interpreted in terms of faster kinetics of solidification of austenite compared to ferrite under the conditions examined. A comparison of the structures produced by the two rapid solidification techniques indicated the cooling rates are comparable.

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Authors and Affiliations

  1. Oak Ridge National Laboratory, 37830, Oak Ridge, TN

    J. M. Vitek (Research Staff Members), A. Dasgupta (Research Staff Members) & S. A. David (Group Leader)

  2. Welding and Brazing Laboratory, USA

    S. A. David (Group Leader)

Authors
  1. J. M. Vitek
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  2. A. Dasgupta
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  3. S. A. David
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Vitek, J.M., Dasgupta, A. & David, S.A. Microstructural modification of austenitic stainless steels by rapid solidification. Metall Trans A 14, 1833–1841 (1983). https://doi.org/10.1007/BF02645553

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  • DOI: https://doi.org/10.1007/BF02645553

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