Dynamic Strain Aging of Various Steels |
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Authors: | Anil K Sachdev |
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Affiliation: | (1) Metallurgy Department, General Motors Research Laboratories, 48090 Warren, MI |
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Abstract: | The dynamic strain aging characteristics of two dual phase steels, a high strength low alloy (HSLA) steel, a 1008 steel and
an interstitial free (IF) steel were determined from tensile properties at temperatures in the range 295 to 460 K (22 to 187
°C) and strain rates between 6 × 10-6 to 10-2s-1. All except the IF steel were found to be susceptible to dynamic strain aging, as evidenced by increases in tensile strength.
The largest positive change was observed in the 1008 steel while the dual phase and HSLA steels showed much smaller increases.
Also, large decreases (up to 75 pct) in uniform elongation were noted for the 1008 steel while the decreases were minimal
for the dual phase and HSLA steels. The IF steel did not strain age and showed a slight increase in uniform elongation with
increasing temperature. Based upon uniform elongation as an indicator of formability, formability might be improved in dual
phase or HSLA steels by reducing the concentration of free interstitials in the ferrites through chemistry control. |
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