- 學位論文
SAE 4130合金鋼順流旋型破裂研究
RESEARCH ON SAE 4130 FORWARD FLOW FORMING TUBE FAILURE
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摘要
本文係針對SAE 4130合金鋼管於順流旋型時，產生破裂現象進行力學破壞模式分析與金相組織研究，並將研究結果回饋進行製程參數改善，最終建立順流旋型成管顯微組織金相。依研究結果顯示，造成鋼管旋型破裂起始之原因，係由於旋型前材料熱處理淬火速率不足，使旋胚產生雜相混合組織，造成材料整體韌性及可旋型性降低導致旋型破裂。而由旋型三軸力學分析，此裂縫成長機構與滾輪施加於旋胚之三軸分力有著密切關係。在本研究中，徑向力是導致旋胚破壞起始源的主要因素，其所造成之破裂方向垂直管件軸向，並穿透旋管壁厚；接著裂縫方向轉變為35°，此區為90°-6°區之轉折區域。最後，破壞模式由三軸合力方向控制，使裂縫轉向6°，但穿透深度則減緩甚多，此角度與力學理論計算結果5.1°相當接近。
並列摘要
The study investigates fracture mode and metallurgy structure of SAE 4130 alloy steel tube on forward flow forming, the result of research will feed back to improve the process parameters, and establish the micro-structure of forward flow forming tube. According to investigate result, the cause of flow forming fracture is that the quench rate of heat treatment before spinning is too slowly result in perform microstructure formation mixture phases, decreasing the perform toughness and spinnability. The force of flow forming analysis is provided to demonstrate the fracture mode transitions. The transitions are determined by the sizes of the resolved forces applied on the spinning materials. In this study, the force of radial direction causes the origin of fracture, result in the cracks perpendicular to longitude direction and penetrates through the thickness of the tube. Subsequently, the crack direction transit 35° to longitude direction. The 35° region is the transition of 90° and 6° regions. Finally, the direction of crack growth is controlled by the resultant forces of rollers. The cracks grow from 35° transition to 6°, and deceasing the depth. The angle is very closed with the calculation result from mechanics theory.
參考文獻
1. M. Hayama and H. Kudo, Experimental Study of Tube Spinning,
2. S. kalpakcioglu, A Study of Shear-Spinnability of Metals, J.
Eng. Ind., Vol. 83, pp.478~484, 1961.
Observations in the Shear Spinning of Long Tubes, J. Mech.
pp.776~784, 1979.
延伸閱讀
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