J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (10): 871-877.

• Nanomaterials and Nanotechnology • Previous Articles     Next Articles

Annealing Effect on Wear Resistance of Nanostructured 316L Stainless Steel Subjected to Dynamic Plastic Deformation

Bo Wang, Bin Yao, Zhong Han   

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2012-04-10 Revised:2012-05-17 Online:2012-10-30 Published:2012-10-31
  • Contact: Zhong Han
  • Supported by:

    the MOST 973 Project (Grant No. 2012CB932201), the International S&T Cooperation Project of China (Grant No. 2010DFB54010), the National Natural Science Foundation of China (Grant No. 51141008), the CAS International Cooperation Project (Grant No. GJHZ1033) & the CAS-Croucher Funding
    Scheme for Joint Laboratories and the Danish-Chinese Centre for Nano-metals (Grant No. 50911130230)

Abstract:

Bulk nanostructured 316L austenitic stainless steel (SS) samples with nano-scale twin bundles embedded in nano-sized grains were synthesized by using dynamic plastic deformation (DPD). Subsequent thermal annealing of the as-DPD sample leads to a single austenitic structure with static recrystallized (SRX) grains in nanostructured matrix. Oil-lubricated sliding tests of ball-on-disc type were carried out for the as-DPD and the as-annealed DPD steel samples in comparison with coarse grained (CG) steel samples. Experimental results show that the as-DPD 316L steel exhibits a little enhanced wear resistance under a load of 10 N, and nearly identical wear resistance under a load of 30 N relative to that of the CG sample. After annealing, the wear
resistance roughly follows the Archard equation under a load of 10 N. However, the wear resistance increases with increasing hardness, and decreases with a further increase in hardness under a load of 30 N. The highest wear resistance can be found in the DPD sample annealed at 750 °C for about 20 min, which is more than 46% higher than that of the CG steel sample. This phenomenon is originated from the microstructure with an optimized combination of strength and ductility as a result of moderate plastic deformation in SRX grained regions.

Key words: Nanostructrued metals ,  Stainless steel ,  Wear resistance ,  Annealing , Subsurface microstructure
microstructure