Abstract
Microstructures of welds of AISI type 316 stainless steel have been examined with a view to establishing the changes that occur during postweld heat treatments in the temperature range 900 to 1100°C. The ferrite content of the weld zone has been estimated using a point count technique in the as-welded condition as well as after heat treatments. In addition, the compositional changes occurring in the ferrite phase have been determined using an electron microprobe analyzer. The ferrite content of the weld decreases continuously with an increase in the aging time. At the same time, the morphology of the ferrite changes from a dendritic network into a distribution of isolated near spherical particles. An analysis of the kinetics of the dissolution and the spheroidization of ferrite suggests that both these processes are controlled by interface diffusion; activation energies for these processes are 132 and 140.5 kJ/mol respectively. The influence of the heat treatment variables on the morphology and composition of the ferrite phase have been discussed.
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Raghunathan, V.S., Seetharaman, V., Venkadesan, S. et al. The influence of post weld heat treatments on the structure, composition and the amount of ferrite in type 316 stainless steel welds. Metall Trans A 10, 1683–1689 (1979). https://doi.org/10.1007/BF02811701
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DOI: https://doi.org/10.1007/BF02811701