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Metals and Materials International

, Volume 25, Issue 1, pp 168–178 | Cite as

Influence of Al Addition Upon the Microstructure and Mechanical Property of Dual-Phase 9Cr-ODS Steels

  • Xiaosheng Zhou
  • Zongqing MaEmail author
  • Liming Yu
  • Yuan Huang
  • Huijun Li
  • Yongchang LiuEmail author
Article
  • 83 Downloads

Abstract

With Al addition, dual-phase oxide dispersion strengthened (ODS) steels consisting of martensite and ferrite are fabricated by spark plasma sintering. It is found that Al addition has a negligible effect on martensite lath size, while the amount and size of ferrite grains are related to the Al content. M23C6 (M = Fe, Cr) carbides have been identified within the ferrite grains or along ferrite boundaries. With increasing Al concentration, more fine Y–Al–O oxide nanoparticles are formed. Upon annealing treatment, homogeneous and refined distribution of ferrite grains is obtained, which may involve the particle-stimulated nucleation of recrystallization caused by the large sized M23C6. As Al is increased from 0.05 to 0.1 wt%, the tensile strength of the annealed steel is decreased, as well as its ductility. For the annealed 9Cr-ODS steel containing 0.1 wt% Al, in tensile loading the large sized M23C6 along ferrite boundaries would facilitate the cracking along boundaries between the hard annealed ferrite and soft annealed martensite, producing the mixed fracture of dimple and intergranular fracture.

Keywords

Oxide nanoparticle Al addition Carbides Particle-stimulated nucleation 

Notes

Acknowledgements

The authors are grateful to the China National Funds for Distinguished Young Scientists (Granted No. 51325401), the National Natural Science Foundation of China (Granted Nos. 51474156 and U1660201), the National Magnetic Confinement Fusion Energy Research Program (Granted No. 2014GB125006) for grant and financial support.

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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  1. 1.State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and EngineeringTianjin UniversityTianjinPeople’s Republic of China

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