Abstract
Tensile property of coarse grain heat affected zone(CGHAZ)is one of the important mechanical property of DP780 cold-rolled dual phase steel, and factors influencing tensile property of CGHAZ include peak temperature, heating rate and cooling rate. Based on response surface method (RSM), two response surfaces models were established. By using Design-Expert software, three factors were combined in pairs. Analysis of variance (ANOVA) was performed on the response surface models. The results showed that tensile property of DP780 was influenced by peak temperature most, then cooling rate, and heating rate made the least influence.
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