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Impenetrable Obstacles in Hardening Processes

Learn about how certain obstacles impede the motion of dislocations, such as very hard carbides that dislocations must bow around, creating a stronger material. Understand friction hardening and the forces between loops and dislocations. Discover the effects of long-range and short-range obstacles.

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Impenetrable Obstacles in Hardening Processes

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  1. NEEP 541 – Hardening II Fall 2002 Jake Blanchard

  2. Outline • Hardening

  3. Hardening by Impenetrable Obstacles • Some barriers cannot be cut by a dislocation • Precipitation hardening creates very hard carbides that connot be sheared • The dislocation must bow around them

  4. Dislocation moving througharray of obstacles

  5. Dislocation Loop Moving Through Obstacles

  6. Loop Hardening • Forces between loops and edge dislocations can impede motion of a dislocation • As before: • Experiments indicate:

  7. Summary • Source Hardening – increase stress to start Frank-Read source • Friction hardening – increase stress required to move dislocations • Long range – forces from other dislocations • Short range - obstacles

  8. Summary • Short range – obstacles • Depleted zones • Impenetrable obstacles • loops

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