Optimum Heat Treatment Conditions for C45 Steel in Fine Blanking Process

Abstract

The objective of research is to investigatc the optimum heat treatment condition for the fine blanking process in order to avoid fracture on the blank, The optimum condition will result in higher elongation while having small decrease in tensile strength. The circular workpiece of 16 mm. in diamcter and 2 mm. thickness was chosen. The material is JIS:S45C which contains 0.45 percent carbon. Unlike the conventional blanking process the fine blanking process yields the blank surface that is smooth and perpendicular to the top surface. However. There are certain factors. Such as low elongation and irregular distribution of microstrure, which prohibit some materials from achieving the mentioned quality. Therefore, the proper heat treatment process of the materials becomes mecessary. In this work, the S45C was chosen because of its availability and widely use. The experiment results showed that the optimum heat treatment will be the one that changes the workpiece is heat at 700ºC for 10 hours. However, the above condition will result in decerase of yield stress approximately 20.57 percent compared to that value of the material before having heat treated.