138 炭素鋼の熱間ハンマー鍛造における型/ワーク界面の観察(塑性加工とその周辺技術)

抄録

The interface of seized interface between die and workpiece was observed in order to understand mechanism of seizure during hot hummer forging of carbon steels. In this study, S55C and SKT4 were used as workpeices and dies, respectively. During hummer forging to form the T-shape cross-section, seizure between die and workpeice was obtained. Die surface by removing seized workpeice can be classified into 4 regions from the upper surface of die, (1) free-die surface area, (2) dimple pattern area, (3) striped structure area, and (4) dotted structure area. Adhesion between workpiece and die is caused by dimple pattern area and striped structure area