Mechanism of Material Softening in Primary Shear Zone during Serrated Chip Formation in High Speed Machining of High Strength Steel

摘要：

The metallurgical observations of microstructure characteristics of the adiabatic shear bands(ASB) within the primary shear zones of the serrated chips produced during high speed machining high strength steel have been performed by using optical microscope, SEM and TEM. The observations showed that the microstructure between the matrix and the center of the ASB gradually was changed, the fine equiaxed grains appeared with size of about 0.4～0.6μm in the center of the adiabatic shear band. The serrated chip formation was likely due to material softening that occurred in the primary shear zones. The microstructural development of dynamic recovery and rotational dynamic recrystallization is the dominant metallurgical process leading to material softening in primary shear zone during high speed machining. A model of microstructural development in primary shear zone during serrated chip formation in high speed machining was suggested by analyzing material softening mechanism.

关键词： High speed machining Serrated chip Primary shear zone Adiabatic shear band(ASB) Dynamic recrystallization

作者: DUAN Chunzheng WANG Minjie CAI Yujun

作者单位: School of Mechanical Engineering, Dalian University of Technology, Dalian, 116023, China Tianjin Key School of Mechanical Engineering, Dalian University of Technology, Dalian, 116023, China Tianjin Key Laboratory of High Speed Cutting & Precision Machining, Tianjin University ofTechnology

会议类型: 国际会议

会议名称: 第九届加工技术进展国际会议(9th International Conference on Progress of Machining Technology)

会议地点: 昆明

会议语种:英文

页码: 504-508

在线出版日期: 2009-04-25（万方平台首次上网日期，不代表论文的发表时间）