Diffusion thermodynamic behavior of milling Ti-6A1-4V alloy in liquid nitrogen cryogenic cooling

被引：0
作者：
Fengbiao Wang
Bo Hou
Yongqing Wang
Haibo Liu
机构：
[1] Shenyang Ligong University,School of mechanical Engineering
[2] Aerospace Research Institute of Materials and Processing Technology,School of mechanical Engineering
[3] Dalian University of Technology,undefined
来源：
The International Journal of Advanced Manufacturing Technology | 2018年 / 95卷
关键词：
Ti-6Al-4V alloy; WC-co tool; Diffusion wear; Cryogenic cooling; Element affinity;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
This paper presents the first comprehensive investigation on milling Ti–6Al–4V alloy in cryogenic cooling, and it mainly focuses on the effect of diffusion wear behavior of WC-Co tool in operations. Diffusion coefficient calculation model of elements is established considering cutting temperature. A series of conventional and cryogenic cooling experiments are conducted, as well as element diffusion behaviors are observed and analyzed by SEM and EDS, and the diffusion coefficient of model is verified. Similarly, the influence of cutting temperature on diffusion wear on contact surface of tool/workpiece is studied. Through the phase diagram analysis of elements, the affinity behaviors between them are researched, and then the mechanism of diffusion wear is deduced. The results showed that the calculation results of diffusion coefficient are similar with the measurement ones under two kinds of cooling model at 150 m/min speed, and they are close to diffusion effect of 1200 and 800 K, respectively. Moreover, Co element has the most difficult diffusion ability, but C and Ti are easiest. At cryogenic conditions, their diffusion degrees are all apparent decline compared with conventional one, and the cutting temperature rise is slow with the increase of cutting speed. Although the former cutting force increases, the workpiece rebound is well suppressed. Furthermore, the friction degree of tool/workpiece is decreased on contact surface, and the elements diffusion behavior of carbide tools is improved. In cryogenic cooling condition, decreased friction degree of tool/workpiece and the weakening of solid solution degree between Ti, W, and Co elements are the main reasons for effectively inhibit of the diffusion wear.
引用
收藏
页码：2783 / 2793
页数：10
相关论文
共 69 条
  • [1] Cheharon CH(2001)Tool life and surface integrity in turning titanium alloy J Mater Process Technol 118 231-237
  • [2] Oezdemir N(2009)Interfacial properties of diffusion bonded Ti-6Al-4V to AISI 304 stainless steel by inserting a Cu interlayer Int J Adv Manuf Technol 41 519-526
  • [3] Bilgin B(2007)Metallurgical study on chips obtained by high speed machining of a Ti-6Al-4V alloy Mater Sci Eng A 452-453 469-474
  • [4] Puerta Velasquez JD(1999)Tool wear characteristics in turning of titanium alloy Ti-6246 J Mater Process Technol 92-93 329-334
  • [5] Bolle B(2010)Comparison of the machinabilities of Ti-6Al-4V and TIMETAL 54M using uncoated WC-Co tools J Mater Process Technol 210 197-203
  • [6] Cheerier P(2008)Wear mechanism of cemented carbide tool in high speed machining titanium alloy Tribology 28 443-447
  • [7] Jawaid A(2008)Diffusion wear in dry cutting of Ti-6Al-4V with WC/Co carbide tools Wear 265 1776-1783
  • [8] Cheharon CH(2015)Wear mechanisms of WC-10Ni3Al carbide tool in dry turning of Ti-6Al-4V Int J Refract Metal Hard Mater 48 272-285
  • [9] Abdullah A(2007)Growth of tool wear in turning of Ti-6Al-4V alloy under cryogenic cooling Wear 262 1071-1078
  • [10] Armendia M(1977)Diffusion wear of cemented carbide tools when cutting steel at high speed Metal Technology 4 548-555
1234567