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Deformation Behavior of a Modified 9Cr–1Mo Steel Between 77 and 373 K

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Published/Copyright: January 3, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 89 Issue 9

Abstract

Tensile samples of a modified 9Cr–lMo steel after tempering at 823 and 983 K subsequent to a normalizing treatment at 1373 K (designated as 550T and 7l0T, respectively) were deformed in tension at temperatures in the range of 77 to 373 K both by constant initial strain-rate tests at ⋵ = 1.1 · 10–4/s and strain-rate change tests between 1.1 · 10–4 and 1.1 · 10–3/s at εtot = 0.05, 0.07, 0.1, 0.12, and 0.14. The 710T specimens showed an increase in ductility and a marginal increase in strength with decreasing test temperature, whereas the 550T specimen exhibited an increased flow stress with very low ductility. The thermal component of flow stress (τ*), the activation volume (υ*) and activation energy (ΔH) were strongly affected by the microstructure. A decrease in τ* observed in the 710T specimens, compared with that of pure iron, at temperatures below 200 K can be attributed to solid solution softening by the dissolved nitrogen atoms. Further, the variations in υ* and Further, the variations inH with stress and temperature supports the importance of the Peierls mechanism for plastic deformation, and the movement of dislocations by double kink formation was found to be strongly affected by free nitrogen atoms.

R. Kishore, R. N. Singh, T. K. Sinha Materials Science Division B.A.R.C. Mumbai 400085, India
B. P. Kashyap Dept. of Metallurgical Engineering and Materials Science Indian Institute of Technology Mumbai 400076, India

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Received: 1997-07-03
Published Online: 2022-01-03

© 1998 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze
  3. Tracer Grain Boundary Diffusion of Silver in α-Zirconium Polycrystals
  4. Calorimetric Determination of the Enthalpy of Formation and the Description of the Constitutional Defects of the Ordered (Ni, Co)1–y Aly, Phase
  5. A Conceptual Modelling of the Tetragonality of L10 (AuCu-I type) Intermetallics
  6. Phase Stability of Hard Alpha in Ti-64 and Ti-17
  7. Phase Diagram Investigation of the Indium-Selenium System
  8. Evaluation of Five-component Phase Diagrams for the Analysis of Phase Composition in Al–Si Based Alloys
  9. The Formation of Interface Phases in the Diffusion Couple Ti–SiC
  10. Deformation Behavior of a Modified 9Cr–1Mo Steel Between 77 and 373 K
  11. The Strength of Ferrite in Annealed Armco Iron and Hypoeutectoid Steels
  12. Notched Strength of Fabric Composite Plates with a Circular Hole
  13. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  14. Personen
  15. Veranstaltungen
  16. Buchbesprechung
https://doi.org/10.3139/ijmr-1998-0119

Articles in the same Issue

  1. Frontmatter
  2. Aufsätze
  3. Tracer Grain Boundary Diffusion of Silver in α-Zirconium Polycrystals
  4. Calorimetric Determination of the Enthalpy of Formation and the Description of the Constitutional Defects of the Ordered (Ni, Co)1–y Aly, Phase
  5. A Conceptual Modelling of the Tetragonality of L10 (AuCu-I type) Intermetallics
  6. Phase Stability of Hard Alpha in Ti-64 and Ti-17
  7. Phase Diagram Investigation of the Indium-Selenium System
  8. Evaluation of Five-component Phase Diagrams for the Analysis of Phase Composition in Al–Si Based Alloys
  9. The Formation of Interface Phases in the Diffusion Couple Ti–SiC
  10. Deformation Behavior of a Modified 9Cr–1Mo Steel Between 77 and 373 K
  11. The Strength of Ferrite in Annealed Armco Iron and Hypoeutectoid Steels
  12. Notched Strength of Fabric Composite Plates with a Circular Hole
  13. Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
  14. Personen
  15. Veranstaltungen
  16. Buchbesprechung
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