Annealing of strain-induced martensite to obtain micro/nanometre grains in austenitic stainless |
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| Authors: | H Wu J Cao M Yang |
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| Affiliation: | 1. Collaborative Innovation Center of Steel Technology, University of Science and Technology, Beijing 100083, China;2. Beijing Engineering Technology Research, Center of Special Steel for Traffic and Energy, Beijing 100083, China;3. Beijing Engineering Technology Research, Center of Special Steel for Traffic and Energy, Beijing 100083, China |
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| Abstract: | Micro/nanometre grain sizes appear to improve the biocompatibility of austenitic stainless steel. In order to realise the reverse transformation (from strain-induced martensite) austenite structure control with micro/nanometre size, the influence of annealing parameters on the microstructure evolution and mechanical properties of 316L-Nb austenitic stainless steel were investigated. Furthermore, the role of Nb in the annealing process was also studied. The results showed that the closely 100% reversion transformation austenite structures were obtained in the samples after annealing at 850°C, where the grains with the grain diameter ≤500?nm accounted for 25% and the grains with the grain diameter >0.5?µm accounted for 75%. The micro/nanometre grain steel not only exhibited a high strength level but also exhibited a desirable elongation. Moreover, the Nb demonstrates a remarkable effect on grain-refining and a significant role in improving the stability of the microstructure. |
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| Keywords: | Austenitic stainless steels Anneal Reverse transformation Grain refinement |
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