What causes some materials to have upper and lower yield points?

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SUMMARY

The discussion focuses on the yield point behavior of low carbon steel (LCS), specifically the presence of both an upper and lower yield point. It is established that the upper yield point is associated with the onset of plastic deformation, while the lower yield point indicates the transition to stable plastic flow. This phenomenon is attributed to the material's microstructural characteristics and the effects of dislocation movement during deformation.

PREREQUISITES
  • Understanding of material science concepts, particularly yield strength and plastic deformation.
  • Familiarity with the microstructure of low carbon steel.
  • Knowledge of dislocation theory in materials science.
  • Basic principles of stress-strain curves in mechanical engineering.
NEXT STEPS
  • Research the microstructural properties of low carbon steel and their impact on yield points.
  • Study dislocation dynamics and their role in plastic deformation.
  • Explore stress-strain curve analysis for various materials, focusing on yield points.
  • Investigate the effects of alloying elements on the yield behavior of steels.
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Materials scientists, mechanical engineers, and students studying material properties and deformation behavior in metals.

||spoon||
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Hey,

Just wondering how to explain the yield point run-off for low carbon steel. Why does LCS have an upper yield point, followed directly by a lower yield point?

Thanks,

-Spoon
 
Engineering news on Phys.org
Thats what i thought ;)

Thanks
 

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