Precision Grinding and Slicing of Si-Wafers

Tönshoff, Hans Kurt; Wobker, H.-G.; Klein, Mona Julia Katharina; Menz, C.

doi:10.1016/b978-0-7506-9484-1.50022-1

Cited by 4 publications

(1 citation statement)

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“…König et al 13 suggest suppression of white layers with coolants. Zurecki et al 11 show that cryogenic nitrogen spray cooling at the cutting tool and the tool–workpiece contact limits the thickness of white layer, but others14,15 indicate no such effect.…”

Section: Introductionmentioning

confidence: 99%

Effects of cryogenic cooling on surface layer alterations in machining of AISI 52100 steels

Umbrello

Yang

Dillon

et al. 2012

Materials Science and Technology

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Microstructural phase transformations, commonly known as white layer formation in hard turned steel components, have in recent times become an interesting research topic in machining as they are related to the surface integrity and functional performance of components. Three main theories have been proposed to justify the mechanisms of white layer formation: (1) rapid heating and quenching; (2) severe plastic deformation; and (3) surface reaction with the environment. Coolant application also affects the surface microstructural alterations resulting from machining operations, which have a significant influence on product performance and life. The present work aims at understanding the effects of cryogenic coolant application on the machined surface alterations during machining of hardened AISI 52100 bearing steel. Experiments were performed under dry and cryogenic cooling conditions using cubic boron nitride tool inserts with varying initial work material hardness, tool shape, cutting speed and feedrate. Optical and scanning electron microscopes (SEM) were used to analyse the affected layer in the machined subsurface, while X-ray diffraction technique was utilised to investigate the microstructural phase composition. The experimental results prove that the microstructural phase changes are heavily influenced by the cutting process parameters and the use of cryogenic cooling, in some cases leading to the total removal of martensite.

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Section: Introductionmentioning

confidence: 99%