7/22/2019 Strain Hardening Exponent - Wikipedia, The Free Encyclopedia

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9/12/13 Strain hardening exponent - Wikipedia, the free encyclopedia

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Strain hardening exponentFrom Wikipedia, the free encyclopedia

The strain hardening exponent(also called strain hardening index), noted as n, is a materials constant which

used in calculations for stress-strain behavior in work hardening.

In the formula = K n,

represents the applied stress on the material, is the strain,

K is the strength coefficient.

The value of the strain hardening exponent lies between 0 and 1. A value of 0 means that a material is a perfectly

plastic solid, while a value of 1 represents a 100% elastic solid. Most metals have an n value between 0.10 and

0.50.

Tabulation

Tabulation of n and K Values for Several Alloys [1]

Material n K (MPa)

Low-carbon steel (annealed) 0.21 600

4340 steel alloy (tempered @ 315C) 0.12 2650

304 stainless steel (annealed) 0.44 1400

Copper (annealed) 0.44 530

Naval brass (annealed) 0.21 585

2024 aluminum alloy (heat treatedT3) 0.17 780

AZ-31B magnesium alloy (annealed) 0.16 450

References

1. ^Callister, Jr., William D (2005),Fundamentals of Materials Science and Engineering(2nd ed.), United States o

America: John Wiley & Sons, p. 199, ISBN 978-0-471-47014-4

External linksMore complete picture about the strain hardening exponent in the stress-strain curve on www.key-to-

steel.com (http://steel.keytometals.com/Articles/Art42.htm)

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