Surface integrity of dry machined titanium alloys
Surface integrity of dry machined titanium alloys
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DOI：
10.1016/j.ijmachtools.2008.10.011
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发表时间：
2009-03-01
影响因子：
14
通讯作者：
Nouari, M.
中科院分区：
文献类型：
--
作者：
Ginting, A.;Nouari, M.
对钛合金干铣削加工表面完整性进行了研究。研究了表面粗糙度、层厚、缺陷、显微硬度和组织变化。表面粗糙度的结果表明，CVD涂层硬质合金刀具未能产生更好的Ra值相比，未涂层的工具。铺设被发现是依赖于切削速度和进给速度的方向。显微硬度改变到350 μ m以下的加工表面。前50 μ m是老化过程中热软化引起的软次表面。下至200 μ m是由循环内部加工硬化引起的硬次表面，然后它逐渐降低到块体材料的硬度。得出的结论是，对于钛合金，干加工可以进行无涂层的硬质合金刀具，只要切削条件是有限的精加工和/或半精加工操作。(C)2008年由Elsevier Ltd.出版
The study is focused on the machined surface integrity of titanium alloy under the dry milling process. Roughness, lay, defects, microhardness and microstructure alterations are investigated. The result of surface roughness shows that the CVD-coated carbide tool fails to produce better Ra value compared to the uncoated tool. Lay is found to be dependent on cutting speed and feed speed directions. Microhardness is altered down to 350 mu m beneath the machined surface. The first 50 pm is the soft subsurface caused by thermal softening in the ageing process. Down to 200 mu m is the hard sub-surface caused by the cyclic internal work hardening and then it gradually decreased to the bulk material hardness. It was concluded that for titanium alloys, dry machining can be carried out with uncoated carbide tools as far as cutting condition is limited to finish and/or semi-finish operations. (C) 2008 Published by Elsevier Ltd.