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Effect of grain size on the static strain aging of a ULC-bake hardening steel

  • A. K. De EMAIL logo , S. Vandeputte , B. Soenen and B. C. De Cooman
Published/Copyright: February 8, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 95 Issue 8

Abstract

Bake hardenability in ultra low carbon bake hardening (ULC-BH) steels is primarily influenced by the (i) solute carbon content in the matrix, (ii) dislocation density and (iii) grain boundaries. Grain boundaries in fine-grained steels significantly change the dislocation distribution and carbon-concentration profiles from grain interior to the grain boundary and correspondingly, the bake hardening response may change. The present study examines the effect of different grain sizes (66–15 µm) on the bake hardening behavior of a ULC-BH steel (total carbon content 24 wt.ppm) as a function of tensile strain (2–5%) and aging temperatures (50–170°C). The carbon concentration profiles across the grains of different sizes have been evaluated both through modeling calculations and experimental measurements. Results showed that the bake hardening decreases with decreasing grain size in general, but there is a critical fine grain size corresponding to a specific amount of tensile strain, at which the bake hardening increases significantly due to the contribution of grain boundary carbon and increased dislocation density adjacent to the grain boundaries.

Keywords: Strain Aging; ULC Steel; Internal Friction; Grain Boundaries; Simulation
Dr. Amar K. De Advanced Steel Processing and Product Research Center Department of Metallurgical and Materials Engineering Colorado School of Mines Golden, CO 80401, USA Tel.: +1 303 384 2013 Fax: +1 303 273 3016

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Received: 2003-11-27
Accepted: 2004-04-22
Published Online: 2022-02-08

© 2004 Carl Hanser Verlag, München

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https://doi.org/10.1515/ijmr-2004-0132
Keywords for this article
Strain Aging; ULC Steel; Internal Friction; Grain Boundaries; Simulation

Articles in the same Issue

  1. Frontmatter
  2. Articles Basic
  3. Thermodynamic modeling of the Ni–S system
  4. Some control mechanisms of spatial solidification in light alloys
  5. Density and excess volume of liquid copper, nickel, iron, and their binary alloys
  6. The absolute thermoelectric power of Nb–Mo alloys
  7. Articles Applied
  8. Structural and mechanical characteristics of ZA27-7 wt.% SiC composites produced by powder metallurgy techniques
  9. Calorimetric study of Zn13La
  10. Effect of grain size on the static strain aging of a ULC-bake hardening steel
  11. Kinetics of ferrite to Widmanstätten austenite transformation in a high-strength low-alloy steel revisited
  12. Transformation behavior of two Ni–Mn–Ga alloys
  13. Notifications/Mitteilungen
  14. Personal/Personelles
  15. News/Aktuelles
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