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On the diffusion wear of cemented carbide in the turning of 316L austenitic stainless steel
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik. (Tribology)ORCID-id: 0000-0001-5536-3077
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
2019 (Engelska)Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 430-431, s. 202-213Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The present study focuses on the wear and wear mechanisms of three different cemented carbide grades during orthogonal turning of 316L austenitic stainless steel at different cutting speeds. The influence of WC grain size and cutting speed on the resulting crater and flank wear was evaluated by optical surface profilometry and scanning electron microscopy (SEM). The mechanisms behind the crater and flank wear were characterized on the sub-micrometer scale using high resolution SEM, energy dispersive X-ray spectroscopy (EDS), Auger electron spectroscopy (AES) and time of flight secondary ion mass spectrometry (ToF-SIMS) of the worn cutting inserts and the produced chips.

The results show that the wear rate of cemented carbide drastically increases with increasing cutting speed and that the wear is dependent on the WC grain size; i.e. the crater wear decreases with increasing WC grain size while the flank wear increases with increasing WC grain size. High resolution SEM, AES and ToF-SIMS analysis of the worn cemented carbide within the crater and flank wear regions reveal that the degradation of cemented carbide at higher cutting speeds is mainly controlled by diffusion wear of the WC-phase. This is confirmed by ToF-SIMS analysis of the back-side of stainless steel chips which reveals the presence of a 10 nm thin W-containing oxide film. The results are discussed and interpreted in the light of the conditions prevailing at the tool-chip interface.

Ort, förlag, år, upplaga, sidor
2019. Vol. 430-431, s. 202-213
Nyckelord [en]
Cemented carbide, 316 L austenitic stainless steel, turning, diffusion wear, SEM, AES, ToF-SIMS
Nationell ämneskategori
Materialteknik
Forskningsämne
Stålformning och ytteknik
Identifikatorer
URN: urn:nbn:se:du-29660DOI: 10.1016/j.wear.2019.05.010ISI: 000471597300021OAI: oai:DiVA.org:du-29660DiVA, id: diva2:1296444
Tillgänglig från: 2019-03-15 Skapad: 2019-03-15 Senast uppdaterad: 2020-06-01Bibliografiskt granskad
Ingår i avhandling
1. Investigation of topography, adhesion and diffusion in sliding contacts during steel and titanium alloy machining
Öppna denna publikation i ny flik eller fönster >>Investigation of topography, adhesion and diffusion in sliding contacts during steel and titanium alloy machining
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The aim of the present thesis work is to increase the fundamental knowledge of the tribological contact between the cutting tool and the work material in three different cutting operations, i.e. hard milling of cold work tool steels, turning in 316L stainless steel and turning in Ti6Al4V alloy, respectively. The influence of cutting parameters and tool surface topography on the initial material transfer tendency and resulting wear and wear mechanisms were investigated under well controlled cutting conditions. High resolution scanning electron microscopy (SEM) and surface analysis, including energy dispersive X-ray spectroscopy (EDS), Auger electron spectroscopy (AES) and time-of-flight secondary ion mass spectrometry (ToF-SIMS), were used in order to characterize the worn cutting tools on a sub-µm scale and deepen the understanding of the wear mechanisms prevailing at the tool / work material interface. The characterization work includes the analysis of worn tool surfaces as well as cross-sections of these. Also, the back side of collected chips were analysed to further understand the contact mechanisms between the tool rake face and chip.

The results show that the transfer tendency of work material is strongly affected by the surface topography of the rake face and that an appropriate pre- and post-coating treatment can be used in order to reduce the transfer tendency and the mechanical interaction between the mating surfaces. The continuous wear mechanisms of the cutting tools were found to be dependent on the work materials and the cutting parameters used. In hard milling of cold work tool steels, polycrystalline cubic boron nitride shows a combination of tribochemical wear, adhesive wear and mild abrasive wear. In the turning of 316L stainless steel and Ti6Al4V alloy, using medium to high cutting speeds/feeds, the wear of cemented carbide is mainly controlled by diffusion wear of the WC phase. Interestingly, the diffusion wear processes differ between the two work materials. In contact with 316L stainless steel crater wear is controlled by atomic diffusion of W and C into the passing chip. In contact with Ti6Al4V crater wear is controlled by the diffusion of C into a transfer work material layer generating a W-rich and TiC interfacial layer which repeatedly is removed by the passing chip. The experimental work and results obtained illustrates the importance of in-depth characterization of the worn surfaces in order to increase the understanding of the degradation and wear of tool materials and coatings in metal cutting operations.

Ort, förlag, år, upplaga, sidor
Uppsala University, 2019
Nationell ämneskategori
Materialteknik
Forskningsämne
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-29700 (URN)
Disputation
(Engelska)
Handledare
Tillgänglig från: 2019-03-27 Skapad: 2019-03-19 Senast uppdaterad: 2019-04-08Bibliografiskt granskad
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Saketi, SaraBexell, UlfOlsson, Mikael

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