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Kumar GVS, Mangipudi KR, Sastry GVS, Singh LK, Dhanasekaran S, Sivaprasad K. Excellent Combination of Tensile ductility and strength due to nanotwinning and a biamodal structure in cryorolled austenitic stainless steel. Sci Rep 2020; 10:354. [PMID: 31941948 PMCID: PMC6962382 DOI: 10.1038/s41598-019-57208-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 12/22/2019] [Indexed: 11/10/2022] Open
Abstract
Austenitic stainless steels are prominent materials for their superior corrosion resistance and a combination of strength and ductility. However, the relatively low yield strength limits its application in high strength structural applications. Cryorolling is one of the promising methods of enhancing the mechanical properties of sheet metals. In the present work, Cryorolling of UNS S31000 stainless steel resulted in five-fold enhancement in yield strength with a significant loss in ductility. However, flash annealing at 800 °C for 120 s could restore its ductility up to 50% of its original ductility. The enhancement in strength is attributed to the formation of deformation nano-twins during flash annealing along with a bimodal grain structure.
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Affiliation(s)
- G Venkata Sarath Kumar
- Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, 620015, Tamil Nadu, India.,Technical Center, Ashokleyland, Chennai, 600103, Tamil Nadu, India
| | - K R Mangipudi
- School of Minerals, Metallurgical and Materials Engineering, Indian Institute of Technology Bhubaneswar-752050, Arugul, Khurda, Odisha, India
| | - G V S Sastry
- Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, Uttar Pradesh, India
| | - Lalit Kumar Singh
- Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, Uttar Pradesh, India
| | - S Dhanasekaran
- Technical Center, Ashokleyland, Chennai, 600103, Tamil Nadu, India
| | - K Sivaprasad
- Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, 620015, Tamil Nadu, India.
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