Influence of Preheating on Chip Segmentation and Microstructure in Orthogonal Machining of Ti6Al4V

被引:29
作者
Joshi, Shashikant [1 ]
Tewari, Asim [1 ]
Joshi, Suhas [1 ]
机构
[1] Indian Inst Technol, Dept Mech Engn, Bombay 400076, Maharashtra, India
来源
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME | 2013年 / 135卷 / 06期
关键词
machining; preheating; shear localization; segmentation; machining affected zone; titanium alloys; TI-6AL-4V ALLOY; SHEAR BANDS; TITANIUM;
D O I
10.1115/1.4025741
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Chip segmentation due to shear localization during machining of titanium alloys affects cutting forces and their machinability. Despite several studies on modeling and understanding influence of chip segmentation, little is known about the effect of preheating on it. This work therefore, involves orthogonal machining of Ti6Al4V alloy under preheating between 100 degrees C and 350 degrees C to investigate chip segmentation, shear band configuration, and microstructure of machined surfaces, through optical and scanning electron microscopy of chips and chip roots. Conceptual models of chip segment formation have been evolved. Shear band formation appears to be the dominant mechanism of chip segmentation up to 260 degrees C preheating, however at 350 degrees C, extent of fracture along the shear plane increases. The preheating increases spacing between shear bands in chips, reduces shear band thickness from 21 mu m at 100 degrees C to 8 mu m at 350 degrees C, and ultimately reduces cutting forces fluctuation, and compressive residual stresses in the machined surfaces.
引用
收藏
页数:11
相关论文
共 30 条
[1]  
Astakov V., 2006, TRIBOLOGY METAL CUTT, P78
[2]   Analysis of a new Segmentation Intensity Ratio "SIR" to characterize the chip segmentation process in machining ductile metals [J].
Atlati, S. ;
Haddag, B. ;
Nouari, M. ;
Zenasni, M. .
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, 2011, 51 (09) :687-700
[3]  
Barnes S., 1966, ASME J MANUF SCI ENG, V118, P422
[4]  
Boothroyd G., 2006, FUNDAMENTAL MACHININ, P87
[5]  
Cahn R., 1996, PHYS METALLURGY, VIII, P2410
[6]   Machinability improvement of titanium alloy (Ti-6Al-4V) via LAM and hybrid machining [J].
Dandekar, Chinmaya R. ;
Shin, Yung C. ;
Barnes, John .
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, 2010, 50 (02) :174-182
[7]  
Davies A., 1997, CIRP ANN-MANUF TECHN, V46, P25
[8]  
Gentel H., 2001, CIRP ANN-MANUF TECHN, V50, P49
[9]  
Huang J., 1996, J MECH BEHAV MAT, P279
[10]  
Hull D., 2001, INTRO DISLOCATIONS, P158