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Materials & Design v.117, 2017년, pp.223 - 231   SCIE
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Low temperature superplastic-like deformation and fracture behavior of nano/ultrafine-grained metastable austenitic stainless steel

Sun, G.S. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ); Du, L.X. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ); Hu, J. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ); Xie, H. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ); Misra, R.D.K. (Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, 500W. University Avenue, El Paso, TX 79968, USA );
  • 초록  

    Abstract We describe here the low temperature superplastic-like deformation in a nano/ultrafine-grained metasable austenitic stainless steel tensile tested at a strain rate of 2.5×10 −4 s −1 and temperature of 600°C (~0.43 of the absolute melting point). The nano/ultrafine-grained structure was obtained via a combination of cold rolling (~93% in reduction), followed by reversion annealing treatments at 650°C for 10min, 30min, and 700°C for 2min, 5min, respectively, an approach previously adopted by Misra's group (references 11–16). The reversion of martensite to austenite was dominated by diffusional mechanism. The nano/ultrafine-grained steel exhibited superplastic-like behavior with maximum elongation approaching ~153% and strain rate sensitivity of ~0.22. Furthermore, tensile deformation behavior at 20°C and 600°C, and the corresponding fracture characteristics are discussed. Observations of fracture surface indicated that the fracture was characterized by line-up of voids along the striations, when tensile tested at 20°C. Whereas, the fracture surface at 600°C mainly consisted of uniform distribution of dimples. To further study the fracture mechanism during superplastic-like deformation, deformed structures from the longitudinal region close to the tip of the fracture surface were studied. The fracture surface of superplastic-like deformed steel was characterized by interlinkage of cavities. Highlights Nano/ultrafine-grained austenitic stainless steel with average grain size of ~150–300nm was obtained. Superplastic-like behavior of nano/ultrafine-grained austenitic stainless steel was observed at a 600°C (~0.43Tm). Fracture behavior during superplastic-like deformation was attributed to be controlled by interlinkage of cavities. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Austenitic stainless steel .   Nano/ultrafine-grained structure .   Reversion mechanism .   Superplasticity .   Fracture.  

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