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Microstructural evolution of as-rolled modified 9Cr-1Mo steel during friction stir welding

  • Jung-Gu Lee , Min-Ku Lee , Chang-Kyu Rhee , Tae-Kyu Kim and Ju-Myoung Kim
Published/Copyright: October 16, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 9

Abstract

Friction stir welding was tried on a modified 9Cr-1Mo (wt.%) ferritic steel in an as-rolled condition. The microstructure of the resultant weld was divided into four distinct regions according to each thermo-mechanical history experienced during welding; i.e., stir zone, thermo-mechanically affected zone, inner heat-affected zone, and outer heat-affected zone. The first three zones showed distinct martensite morphologies depending on the different recrystallization phenomena during the heating cycle in the single-phase austenite region. In the outer heat-affected zone, however, only tempering occurred without phase transformation owing to a relatively low heating temperature. Hardness distribution of the weld closely reflected such microstructural differences, indicating that a considerable softening occurred in the thermo-mechanically affected zone and outer heat-affected zone owing to the coarsening and tempering effects, respectively.

Keywords:: Modified 9Cr-1Mo steel; Friction stir welding; Microstructure; Thermo-mechanical effect; Recrystallization
* Correspondence address, Dr. Min-Ku Lee, Nuclear Materials Development Division, Korea Atomic Energy Research Institute (KAERI), Dukjin-dong 150-1, Yuseong-gu, Daejeon, 305-353, Republic of Korea, Tel: +82-42-868-8565, Fax: +82-42-868-4847, E-mail:

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Received: 2012-10-10
Accepted: 2013-3-5
Published Online: 2013-10-16
Published in Print: 2013-09-12

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110933
Keywords for this article
Modified 9Cr-1Mo steel; Friction stir welding; Microstructure; Thermo-mechanical effect; Recrystallization

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. The interrelated effect of activation energy and grain boundary energy on grain growth in nanocrystalline materials
  5. Microstructural evolution of as-rolled modified 9Cr-1Mo steel during friction stir welding
  6. Effect of milling duration on the evolution of shape memory properties in a powder processed Cu–Al–Ni–Ti alloy
  7. Experimental investigation of phase equilibria in the Co–Cr–W ternary system
  8. Phase equilibria of the Zn–Al–Ti system at 370°C in the Zn-rich region
  9. Enthalpies of mixing in liquid alloys of iron with the lanthanides
  10. Ab-initio studies of some rare-earth borides: CeB2, PrB2, NdB2, and PmB2
  11. Influence of different contents of Si and Cu on the solidification pathways of cast hypoeutectic Al-(5–9)Si-(1–4)Cu (wt.%) alloys
  12. Undercooling of Sn–Ag–Cu alloys: solder balls and solder joints solidification
  13. Nitrogen deficiency and metal dopant induced sub-stoichiometry in titanium nitride thin films: a comparative study
  14. The influence of AlCrN coating on the high-temperature corrosion resistance of Ti-46Al-7Nb alloy in an atmosphere containing 9%O2 + 0.2%HCl + 0.08%SO2 + N2
  15. PEMFC membrane electrode assembly degradation study based on its mechanical properties
  16. Effect of epoxy resin properties on the mechanical properties of carbon fiber/epoxy resin composites
  17. Microstructural aspects of ceramic hollow microspheres reinforced metal matrix composites
  18. Copper/bamboo fabric composite prepared via a silver catalytic electroless deposition process for electromagnetic shielding
  19. People
  20. Dr. Herbert Karl Schmid
  21. Ludwig Gauckler
  22. DGM News
  23. DGM News
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