The effect of surface and subsurface condition on the fatigue life of Ti–25V–15Cr–2Al–0.2C %wt alloy

Novovic, Donka; Aspinwall, D.K.; Dewes, R.C.; Bowen, P.; Griffiths, Brian

doi:10.1016/j.cirp.2016.04.074

Cited by 25 publications

(20 citation statements)

References 13 publications

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“…In contrast, surface layer properties such as inherent stresses and hardness, cannot be controlled easily so far [1]. However, precisely these properties are of decisive importance for the service life and operating behavior of the components [2]. Therefore, it is important to understand the processes occurring during the manufacturing processes, which lead to a change in the material properties, better.…”

Section: Introductionmentioning

confidence: 99%

Precise In-Process Strain Measurements for the Investigation of Surface Modification Mechanisms

Tausendfreund

Stöbener

Fischer

2018

JMMP

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Abstract:The question, how certain surface layer properties (for example, hardness or roughness) can be specifically influenced in different manufacturing processes, is of great economic interest. A prerequisite for the investigation of the formation of surface layer properties is the metrological assessment of the material stresses during processing. Up to now, no commercial in-process measuring system exists, which is able to determine material stresses in the form of mechanical strains in high-dynamic manufacturing processes with sufficient accuracy. A detailed analysis of the resolution limits shows that speckle photography enables deformation measurements with a resolution in the single-digit nanometer range. Thus, speckle photography basically offers the potential to measure material stresses during processing. Using the example of single-tooth milling, the applicability of speckle photography for in-process stress measurements is demonstrated. Even in such highly dynamic manufacturing processes with cutting speeds up to 10 m/s, the absolute measurement uncertainty of the strain is less than 0.05%. This is more than one order of magnitude lower than the occurring maximal strain. Therefore, speckle photography is suitable for characterizing the dynamic stresses and the material deformations in manufacturing processes.

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Section: Introductionmentioning

confidence: 99%

Precise In-Process Strain Measurements for the Investigation of Surface Modification Mechanisms

Tausendfreund

Stöbener

Fischer

2018

JMMP

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“…Based on the calculated temperatures along the shear plane, Weiner determined the heat flow into the chip and related it to the total shear power to derive the fraction of shear plane heat transferred into the workpiece according to Equation (1). His equation for the fraction depends on the thermal number N th and the shear angle φ according to Equation (2). An increase of this dimensionless number √ Y L leads to a decrease of the fraction of heat transferred into the workpiece.…”

Section: Analytical Modeling Approachesmentioning

confidence: 99%

“…Surface and subsurface properties of the workpiece, such as the residual stress state, are highly affected through the occurring thermal load during machining, i.e., the temperature distribution and the involved temperature gradients [1]. Thermally activated material modifications, in the worst-case thermal damage, might impair the functional performance of the part [2]. Therefore, understanding and predicting the fraction of heat transferred into the workpiece is of major concern.…”

Section: Introductionmentioning

confidence: 99%

Partition of Primary Shear Plane Heat in Orthogonal Metal Cutting

Langenhorst

Sölter

Kuschel

2020

JMMP

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When assessing the effect of metal cutting processes on the resulting surface layer, the heat generated in the chip formation zone that is transferred into the workpiece is of major concern. Models have been developed to estimate temperature distributions in machining processes. However, most of them need information on the heat partition as input for the calculations. Based on analytical and numerical models, it is possible to determine the fraction of shear plane heat transferred into the workpiece for orthogonal cutting conditions. In the present work, these models were utilized to gain information on the significant influencing factors on heat partition, based on orthogonal cutting experiments, experimental results from the literature, and a purely model-based approach. It could be shown that the heat partition does not solely depend on the cutting velocity, the uncut chip thickness, and the thermal diffusivity—combined in the dimensionless thermal number—but the shear angle also has to be taken into account, as already proposed by some researchers. Furthermore, developed numerical models show that a more realistic representation of the process kinematics, e.g., regarding chip flow and temperature-dependent material properties, do not have a relevant impact on the heat partition. Nevertheless, the models still assume an idealized orthogonal cutting process and comparison to experimental-based findings on heat partition indicates a significant influence of the cutting edge radius and the friction on the flank face of the tool.

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“…Novovicetc et al investigated the effected of surface and subsurface condition on the fatigue life of Ti alloy workpiece. Their research results indicated that the surface topography, in particular texture direction, showed a strong correlation with the fatigue life of workpiece [51]. Piska et al [52] studied the effect of progressive milling process on the surface morphology and fatigue properties of 7475-T7351 high-strength aluminum alloy.…”

Section: Fatigue Strength and Wear Resistance As Effected By Surface mentioning

confidence: 99%

Part Functionality Alterations Induced by Changes of Surface Integrity in Metal Milling Process: A Review

et al. 2018

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It has been proved that surface integrity alteration induced by machining process has a profound influence on the performance of a component. As a widely used processing technology, milling technology can process parts of different quality grades according to the processing conditions. The different cutting conditions will directly affect the surface state of the machined parts (surface texture, surface morphology, surface residual stress, etc.) and affect the final performance of the workpiece. Therefore, it is of great significance to reveal the mapping relationship between working conditions, surface integrity, and parts performance in milling process for the rational selection of cutting conditions. The effects of cutting parameters such as cutting speed, feed speed, cutting depth, and tool wear on the machined surface integrity during milling are emphatically reviewed. At the same time, the relationship between the machined surface integrity and the performance of parts is also revealed. Furthermore, problems that exist in the study of surface integrity and workpiece performance in milling process are pointed out and we also suggest that more research should be conducted in this area in future.

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The effect of surface and subsurface condition on the fatigue life of Ti–25V–15Cr–2Al–0.2C %wt alloy

Cited by 25 publications

References 13 publications

Precise In-Process Strain Measurements for the Investigation of Surface Modification Mechanisms

Precise In-Process Strain Measurements for the Investigation of Surface Modification Mechanisms

Partition of Primary Shear Plane Heat in Orthogonal Metal Cutting

Part Functionality Alterations Induced by Changes of Surface Integrity in Metal Milling Process: A Review

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