MSE 210 Lecture 3

MSE 210 Lecture 3 - Annealing, Hardness and Microscopy...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Annealing, Hardness and Microscopy Lecture 3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1 hour treatment at T anneal ... decreases TS and increases % EL . Effects of cold work are reversed! 3 Annealing stages to discuss. .. Adapted from Fig. 7.22, Callister 7e. (Fig. 7.22 is adapted from G. Sachs and K.R. van Horn, Practical Metallurgy, Applied Metallurgy, and the Industrial Processing of Ferrous and Nonferrous Metals and Alloys , American Society for Metals, 1940, p. 139.) Effect of Heating After CW tensile strength (MPa) ductility (%EL) tensile strength ductility Recovery Recrystallization Grain Growth 600 300 400 500 60 50 40 30 20 annealing temperature (ºC) 200 100 300 400 500 600 700
Background image of page 2
Influence of Annealing Annealed metal → cold work increases hardness, strength, and resistivity while reducing ductility and formability 10 4 dislocations/cm 2 → 10 11 dislocations/cm 2 Recovery. Properties revert partially back to values before cold working; achieve some decrease in dislocation density but no observable microstructural change. Recrystallization. Deformed grains are 100% replaced by a new set of equiaxed grains and properties are returned to values for the annealed metal prior to any cold work. New grains are smaller than original ones. Recrystallization temperature is the temperature at which the metal has just completed recrystallization in one hour. Increases with impurities and Tmp. Grain growth. Average grain size increases with increasing
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 18

MSE 210 Lecture 3 - Annealing, Hardness and Microscopy...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online