GATE ME 2015 Set 3 — Question 15
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Engineering Materials → Forming → Mechanical Properties & Stress-Strain
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Question
The strain hardening exponent of stainless steel SS 304 with distinct yield and UTS values undergoing plastic deformation is
Correct answer
(C) 0 < n < 1
Solution
The plastic deformation of many metals is described by the Hollomon equation , where is the strain hardening exponent. For materials that exhibit strain hardening (like SS 304), is a positive value typically between 0.1 and 0.5. A value of corresponds to a perfectly plastic material, and corresponds to a perfectly elastic material. Since the material undergoes plastic deformation with distinct yield and UTS points, the exponent must be in the range .
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