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Effect of Solution Annealing Treatments on Formabilityof Stainless Steel Alloys | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 15, Issue 3, 2011, Pages 225-248 | ||
| Authors | ||
| M. A. Abdulallah; H. B. Rahmetallah; Samir Ali Alrabii | ||
| Abstract | ||
| The effect of solution annealing treatment on the formability of three stainless steel alloys (AISI 321, GOST A917, and SAF 2205) has been studied. Properties obtained from tensile testing (strength, ductility, strain hardening index, and strain rate sensitivity) have been chosen as criteria to detect formability. The values of those criteria were compared with stretching behavior obtained from Olsen test (h-value). Solution annealing treatment, at the range 900-1350oC for 30 min. followed by water quenching, showed a remarkable effect on formability for the three alloys. Annealing the duplex stainless steels at 950oC and at temperatures higher than 1050oC, was found to decrease the strain hardening index (formability) due to the formation of brittle phases during annealing at 950oC, and also due to increase of ferrite content when annealing at temperatures higher than 1050oC. The rate of cooling (water quenching, air cooling, and furnace cooling) after annealing at 1050oC showed to have an effect on the formability of the three alloys in a way that air cooling and water quenching produced better formability than furnace cooling due to formation of brittle carbides and grain growth during furnace cooling. Increasing annealing time reduced tensile and yield strengths, while it had a little effect on Vickers hardness value. Strain hardening index was found to be increased with increasing annealing time. The results of stretching and tensile tests were conformed for the two duplex steels at different annealing temperatures and cooling rates but they did not for the austenitic steel due to the enormous crystalline growth caused by increasing the solution annealing temperature | ||
| Keywords | ||
| Austenitic and Duplex stainless steels; Solution Annealing; formability; Tensile and Stretching Tests | ||
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