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SCNCrM-2B와 SM25C의 마찰용접특성에 관한 연구
이세경(Se-Gyoung Lee),심영만(Young-Man Sim),민택기(Taeg-Ki Min) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.4
This study deals with the friction welding of SM25C and SCNCrM-2B; The friction time was variable conditions under the conditions of spindle revolution 2,000rpm, friction pressure of 100㎫, upset pressure of 150㎫, and upset time of 4.0 seconds. Under these conditions, the microstructure of weld interface, tensile fracture surface and mechanical tests were studied, and so the results were as follows. 1. When the friction time is 2.0 seconds, the tensile strength of friction welds was 874㎫, which is around as much as 117% of the tensile strength of base metal(SM25C), the bending strength of friction welds was 1,354㎫, which is around as much as 108.9% of the bending strength of base metal(SM25C). 2. At the same condition, the maximum vickers hardness was Hv443 at SCNCrM-2B nearby weld interface, which is higher Hv20 than condition of the friction time 0.5 seconds. 3. The results of microstructure analysis show that the structures of two base materials have fractionated and rearranged along a column due to heating and axial force during friction, which has affected in raising hardness and tensile strength.
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