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Enhanced Mechanical Properties of Nano/Ultrafine-Grained Structure Formed by Martensite Reversion in 18Cr–8Ni Austenitic Stainless Steel

  • J. Liu
  • X. T. DengEmail author
  • Z. D. Wang
Conference paper
  • 114 Downloads
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

An NG/UFG austenitic stainless steel of type 18Cr–8Ni austenitic stainless steel was produced by strain-induced martensite phase reversion process. Severe cold deformation (70% reduction) at room temperature was carried out, followed by annealing in the conditions of 710 °C—10 min, 760 °C—5 min, and 950 °C—5 min. The nano/ultrafine grain size obtained was 400 nm, with the yield strength of 878 MPa and high ductility of 33%. The study of the deformation behavior of CG and NG/UFG steels found that the microstructure after ~11% tensile strain of NG/UFG steel included a number of dislocations and deformation twins. In addition, deformation bands and strain-induced martensite were observed in the deformed austenite grain. Whereas after ~11% tensile strain of CG steel, a large number of dislocations, stacking faults, and deformation bands were observed.

Keywords

Austenitic stainless steel Strain-induced martensite Nano/ultrafine-grained structure 

Notes

Acknowledgements

The authors gratefully acknowledge support from the National Science Foundation of China (Grant No. 51474064, 51504064, 51234002), National Key Research and Development Program 2016 YFB 0300601, China Postdoctoral Science Foundation 2016M591443, and the Fundamental Research Funds for the Central Universities N160704002, N160708001.

References

  1. 1.
    Karjalainen LP, Taulavuori T, Sellman M, Kyröläinen A (2008) Some strengthening methods for austenitic stainless steels. Steel Res Int 79:404–412CrossRefGoogle Scholar
  2. 2.
    Murata Y, Ohashi S, Uematsu Y (1993) Recent trends in the production and use of high strength stainless steels. ISIJ Int 33:711–720CrossRefGoogle Scholar
  3. 3.
    Zhilyaev AP, Nurislamova GV, Kim BK, Baró MD, Szpunar JA, Langdon TG (2003) Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion. Acta Mater 51:753–765CrossRefGoogle Scholar
  4. 4.
    Saito Y, Utsunomiya H, Tsuji N, Sakai T (1999) Novel ultra-high straining process for bulk materials—development of the accumulative roll-bonding (ARB) process. Acta Mater 47:579–583CrossRefGoogle Scholar
  5. 5.
    Valiev RZ, Langdon TG (2006) Principles of equal-channel angular pressing as a processing tool for grain refinement. Prog Mater Sci 51:881–981CrossRefGoogle Scholar
  6. 6.
    Misra RDK, Zhang Z, Jia Z, Venkatsurya PKC, Somani MC, Karjalainen LP (2012) Nanoscale deformation experiments on the strain rate sensitivity of phase reversion induced nanograined/ultrafine-grained austenitic stainless steels and comparison with the coarse-grained counterpart. Mater Sci Eng A 548:161–174CrossRefGoogle Scholar
  7. 7.
    Challa VSA, Misra RDK, Somani MC, Wang ZD (2016) Influence of grain structure on the deformation mechanism in martensitic shear reversion-induced Fe-16Cr-10Ni model austenitic alloy with low interstitial content: coarse-grained versus nano-grained/ultrafine-grained structure. Mater Sci Eng A 661:51–60CrossRefGoogle Scholar
  8. 8.
    Misra RDK, Zhang Z, Venkatasurya PKC, Somani MC, Karjalainen LP (2010) Martensite shear phase reversion-induced nanograined/ultrafine-grained Fe–16Cr–10Ni alloy: the effect of interstitial alloying elements and degree of austenite stability on phase reversion. Mater Sci Eng A 527:7779–7792CrossRefGoogle Scholar
  9. 9.
    Ma Y, Jin JE, Lee YK (2005) A repetitive thermomechanical process to produce nano-crystalline in a metastable austenitic steel. Scr Mater 52:1311–1315CrossRefGoogle Scholar
  10. 10.
    Liu J, Deng XT, Huang L, Wang ZD (2016) High-cycle fatigue behavior of 18Cr-8Ni austenitic stainless steels with grains ranging from nano/ultrafine-size to coarse. Mater Sci Eng A 733:128–136CrossRefGoogle Scholar
  11. 11.
    Somani MC, Karjalainen LP, Kyröläinen A, Taulavuori T (2007) Processing of submicron grained microstructures and enhanced mechanical properties by cold-rolling and reversion annealing of metastable austenitic stainless steels. Mater Sci Forum 539:4875–4880CrossRefGoogle Scholar
  12. 12.
    Liu J, Deng XT, Huang L, Wang ZD, Misra RDK (2018) Mechanical properties and deformation behavior of nano/ultrafine Fe–18Cr–8Ni austenitic steel processed by low temperature rolling and annealing treatment. Steel Res Int 89(6):1700496Google Scholar
  13. 13.
    Eskandari M, Najafizadeh A, Kermanpur A (2009) Effect of strain-induced martensite on the formation of nanocrystalline 316L stainless steel after cold rolling and annealing. Mater Sci Eng A 519:46–50CrossRefGoogle Scholar
  14. 14.
    Challa VSA, Wan XL, Somani MC, Karjalainen LP, Misra RDK (2014) Strain hardening behavior of phase reversion-induced nanograined/ultrafine-grained (NG/UFG) austenitic stainless steel and relationship with grain size and deformation mechanism. Mater Sci Eng A 613:60–70CrossRefGoogle Scholar
  15. 15.
    Misra RDK, Shah JS, Mali S, Venkata Surya PKC, Somani MC, Karjalainen LP (2013) Phase reversion induced nanograined austenitic stainless steels: microstructure, reversion and deformation mechanisms. Mater Sci Technol 29:1185–1192CrossRefGoogle Scholar
  16. 16.
    Challa VSA, Wan XL, Somani MC, Karjalainen LP, Misra RDK (2014) Significance of interplay between austenite stability and deformation mechanisms in governing three-stage work hardening behavior of phase-reversion induced nanograined/ultrafine-grained (NG/UFG) stainless steels with high strength-high ductility combination. Scripta Mater 86:60–63CrossRefGoogle Scholar
  17. 17.
    Talonen J, Hänninen H (2007) Formation of shear bands and strain-induced martensite during plastic deformation of metastable austenitic stainless steels. Acta Mater 55:6108–6118CrossRefGoogle Scholar
  18. 18.
    Misra RDK, Kumar BR, Somani M, Karjalainen P (2008) Deformation processes during tensile straining of ultrafine/nanograined structures formed by reversion in metastable austenitic steels. Scr Mater 59:79–82CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  1. 1.State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyangChina

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