Abstract
The effect of various parameters, namely amount of prestrain, time of aging, and temperature of aging on the response, that is the increase in the yield strength, of a dual-phase steel was studied by applying statistical design of experiments. A regression equation was developed between the response and the parameters. The equation was corrected by Student “t” test and was found to be adequate as checked by Fisher “F” test and random experiment. Within the range of variables studied, the amount of prestrain, the time of aging, and the temperature of aging had negative, insignificant, and very significantly positive influence, respectively. An attempt was made to achieve a maximum for the response surface. The maximum was found to result from a combination of the parameters such as 0.5% tensile prestrain, aging time of 12 min, and aging temperature of 320°C.
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