Role of phase transformation in chip segmentation during high speed machining of dual phase titanium alloys
Role of phase transformation in chip segmentation during high speed machining of dual phase titanium alloys
复制标题
双相钛合金高速加工过程中相变在切屑分割中的作用
DOI：
10.1016/j.jmatprotec.2014.07.007
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发表时间：
2014-12
影响因子：
6.3
通讯作者：
A.K.Srivastava
中科院分区：
文献类型：
--
作者：
Xueping Zhang;R.Shivpuri;A.K.Srivastava
钛合金切削过程中的切屑分割主要是由于与极高速度下的热驱动α-β相变相关的绝热剪切局部化。现有的材料本构模型在模拟切削加工过程中忽略了相变在剪切局部化中的作用及其对材料动态响应的影响。本研究提出了一种新的相切屑分割方法，包括最近开发的本构材料模型的基础上的自洽方法（SCM），占材料成分，以及α-β相变，在加工过程中。该基于SCM的模型在有限元框架中实现，以验证和预测原材料属性、切削速度、未切削切屑厚度、前角、刀具半径和摩擦系数对切屑分割中的应变、温度和β体积分数的影响。结果表明，切削速度和未切屑厚度对切屑分割影响较大，前角影响较小，刀具半径和摩擦系数影响最小。然而，刀具几何形状以及加工参数对加工表面的温度幅值、影响深度和相关的α-β相变有很大影响。
Chip segmentation during machining of titanium alloys is primarily due to adiabatic shear localization associated with thermally driven α–β phase transformation at extremely high speeds. Current constitutive material models used in simulating the machining process ignore the role of phase transformation in shear localization and its influence on the material associated dynamic response. This research presents a new phase approach to chip segmentation that includes a recently developed constitutive material model based on the self-consistent method (SCM) that accounts for material composition, as well as α–β phase transformation, during machining. This SCM-based model is implemented in the finite element framework to validate and predict the effects of starting material property, cutting speeds, uncut chip thicknesses, rake angles, tool radius, and friction coefficients on the strains, temperatures and β volume fractions in chip segmentation. It confirms that cutting speed and uncut chip thickness have great impact, rake angle has less effect, tool radius and friction coefficient have the least effects on chip segmentation. However, tool geometry as well as machining parameters have great influence on the machined surface in terms of temperature magnitude, affected depth and the associated α–β phase transformation.
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影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
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影响因子：
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