Does Heat Treatment Affect Elasticity? Investigating Changes in Young's Modulus

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SUMMARY

The discussion centers on the impact of heat treatment on the elasticity of materials, specifically investigating changes in Young's Modulus. Two methods were examined: annealing, where a hot bobby pin cools slowly, and quenching, where it cools rapidly in water. The consensus indicates that heat treatment can alter Young's Modulus due to changes in atomic bonding and interatomic distances, although some sources argue otherwise. The key equations involved are Y = σ/ε, ε = ΔL/Lo, and σ = F/A, which are fundamental in understanding material elasticity.

PREREQUISITES
  • Understanding of Young's Modulus and its significance in material science.
  • Familiarity with heat treatment processes, specifically annealing and quenching.
  • Basic knowledge of stress and strain equations in mechanics.
  • Concepts of atomic bonding and interatomic distances in materials.
NEXT STEPS
  • Research the effects of annealing on metal properties and microstructure.
  • Explore the principles of quenching and its impact on hardness and brittleness.
  • Study the relationship between temperature changes and atomic bonding in materials.
  • Learn about experimental methods to measure Young's Modulus in different heat-treated states.
USEFUL FOR

Material scientists, mechanical engineers, and students studying material properties and heat treatment processes will benefit from this discussion.

Dionisius DH
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Homework Statement


The experiment :
How the elasticity of material might change under heat treatment?
The experiments conducted in two different way, first one the hot bobby pin set to cool down slowly after heated (the professor called annealing treatment), and the second one the pin set to cool down rapidly in the water (called quenching). Why does this phenomenon happen?

Homework Equations


Y = σ/ ε
ε = ΔL / Lo
σ = F/A

The Attempt at a Solution


Some sources said that Young's Modulus is affected by heat treatment because Young's modulus has its origin in the nature of bonding including interatomic distances, some others said that it doesn't affect Young's Modulus.
 
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