Effect of Heat Treatment Process on Mechanical Properties and Cutting Edge Characteristics of High Strength Steel (DP590)
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Abstract
This research is study to the effect of heat treatment process of dual phase high strength steel sheets. For improve the quality of the cutting edge by used of different heat treatment processes of sheet metal, which consists of tempering, normalizing and annealing process. Examine the effect on mechanical properties, microstructure and different region heights on the cutting edge. The experiment result shown that, the heat treatment process affected to changes of the microstructure and mechanical properties of metal sheets. Where the sheet metal that has undergone a tempering process, the martensite phase have a look more fine, which results in a slight increase in the yield stress, vice versa the tensile strength and elongation was decrease. For the sheet metal that has undergone normalizing processes at Upper-Critical Temperature. This causes the martensite phase to decompose completely and the rapid cooling gives the material a disordered microstructure. As a result, the strength is reduced and the elongation is increased. On the case of annealing process, as a result of slow cooling rate in the furnace, affect to the grain grows. As a result, the strength decreases and elongation significantly increase. The mechanical properties of sheet metal are directly related to the cutting edge characteristics. It was found that the height of the rollover region was inversely proportional to the yield stress of the material. The height of the burnish region is inversely proportional to the tensile strength. The height of fracture region is inversely proportional to the tensile strength and elongation, the burr height is proportional to the elongation of metal sheets.
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