Surface Integrity Difference between Hard Turned and Ground Surfaces and Its Impact on Fatigue Life

Hashimoto, Fukuo; Guo, Y. B.; Warren, A. W.

doi:10.1016/s0007-8506(07)60371-0

Cited by 118 publications

(63 citation statements)

References 9 publications

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“…Microhardness (Knoop indenter at a load of 25 gf) and nanohardness measurements (Berkovich indenter at a maximum load of 8 mN) were carried out on hardened bearing steel samples subjected to turning and grinding followed by superfinishing [32]. Both methods indicated that the ground specimens presented higher hardness values than the turned samples, probably due to the size effect induced by the small down-feed employed in the grinding operation, which leads to a severe stress gradient near the machined surface.…”

Section: Hardness Alterationsmentioning

confidence: 99%

Surface Integrity

Abrão

Ribeiro

Davim

2011

Machining of Hard Materials

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Surface integrity comprises the study of the alterations induced during the manufacture of a component that might affect its properties and service performance. Therefore, additionally to geometric irregularities (surface texture and both dimensional and geometric deviations), the study on surface alterations (such as metallurgical alterations, cracks and residual stresses) induced by hard-part machining is of utmost importance, especially in the case of components subjected to dynamic loading. Consequently, this chapter is focused on the investigation of the influence of tool material and geometry and cutting parameters on the surface integrity of components subjected to hard-part machining and, when applicable, comparisons are drawn with grinding and non-conventional processes, especially electrical discharge machining (EDM). Geometric IrregularitiesOwing to the fact that in most cases hard-part machining is employed as an alternative to grinding, the requirements concerned with surface texture (microgeomet-__________________________________ A.M. Abrão

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Section: Hardness Alterationsmentioning

confidence: 99%

Surface Integrity

Abrão

Ribeiro

Davim

2011

Machining of Hard Materials

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“…• The so-called "white layer" formation in hard machining [2][3][4], invisible to the naked eye, is a very thin shell of material that is harder than the underlying material. The thickness of a white layer formed during hard machining increases with tool wear, as shown in Figure 1.3.…”

mentioning

confidence: 99%

Machining of Hard Materials – Definitions and Industrial Applications

Astakhov

2011

Machining of Hard Materials

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“…As such, the technique has also been increasingly applied to hard materials (typically in the range of 58 to 68 HRC) and is even replacing conventional grinding processes in some instances, due to reduced machining costs, as well as improved surface integrity [4,5]. However, the application of dry high speed machining of hard materials introduces the problems of harsh tribological conditions at the tool-chip interface and excessive tool wear.…”

Section: Introductionmentioning

confidence: 99%

Influence of Workpiece Material on Tool Wear Performance and Tribofilm Formation in Machining Hardened Steel

et al. 2016

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In addition to the bulk properties of a workpiece material, characteristics of the tribofilms formed as a result of workpiece material mass transfer to the friction surface play a significant role in friction control. This is especially true in cutting of hardened materials, where it is very difficult to use liquid based lubricants. To better understand wear performance and the formation of beneficial tribofilms, this study presents an assessment of uncoated mixed alumina ceramic tools (Al2O3+TiC) in the turning of two grades of steel, AISI T1 and AISI D2. Both workpiece materials were hardened to 59 HRC then machined under identical cutting conditions. Comprehensive characterization of the resulting wear patterns and the tribofilms formed at the tool/workpiece interface were made using X-ray Photoelectron Spectroscopy and Scanning Electron Microscopy. Metallographic studies on the workpiece material were performed before the machining process and the surface integrity of the machined part was investigated after machining. Tool life was 23% higher when turning D2 than T1. This improvement in cutting tool life and wear behaviour was attributed to a difference in: (1) tribofilm generation on the friction surface and (2) the amount and distribution of carbide phases in the workpiece materials. The results show that wear performance depends both on properties of the workpiece material and characteristics of the tribofilms formed on the friction surface.

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Surface Integrity Difference between Hard Turned and Ground Surfaces and Its Impact on Fatigue Life

Cited by 118 publications

References 9 publications

Surface Integrity

Surface Integrity

Machining of Hard Materials – Definitions and Industrial Applications

Influence of Workpiece Material on Tool Wear Performance and Tribofilm Formation in Machining Hardened Steel

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