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Olsson, Mikael
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Saketi, S., Östby, J., Bexell, U. & Olsson, M. (2019). A methodology to systematically investigate the diffusion degradation of cemented carbide during machining. Materials, 12(14), Article ID 2271.
Åpne denne publikasjonen i ny fane eller vindu >>A methodology to systematically investigate the diffusion degradation of cemented carbide during machining
2019 (engelsk)Inngår i: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, nr 14, artikkel-id 2271Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Using Ti6Al4V as a work material, a methodology to systematically investigate the diffusion degradation of cemented carbide during machining is proposed. The methodology includes surface characterization of as-tested worn inserts, wet etched worn inserts, metallographic cross-sectioned worn inserts as well as the back-side of the produced chips. Characterization techniques used include scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Auger electron spectroscopy (AES) and time of flight secondary ion mass spectroscopy (ToF-SIMS).

The results show that the characterization of wet etched worn inserts give quick and useful information regarding the diffusion degradation of cemented carbide, in the present work the formation of a fine crystalline W layer (carbon depleted WC layer) at the tool / work material interface. The present study also illuminates the potential of AES analysis when it comes to analyzing the degradation of cemented carbide in contact with the work material during machining. The high surface sensitivity in combination with high lateral resolution makes it possible to analyze the worn cemented carbide surface on a sub-µm level. Especially AES sputter depth profiling, resulting in detailed information of variations in chemical composition across interfaces, is a powerful tool when it comes to understanding diffusion wear. Finally, the present work illustrates the importance of analyzing not only the worn tool but also the produced chips. An accurate characterization of the back-side of the chips will give important information regarding the wear mechanisms taking place at the tool rake face / chip interface. Surface analysis techniques such as AES and ToF-SIMS are well suited for this type of surface characterization.

Emneord
Turning, Ti6Al4V, Wear, Tool, Chip, SEM, AES, ToF-SIMS
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-29661 (URN)10.3390/ma12142271 (DOI)000480454300059 ()31311114 (PubMedID)2-s2.0-85070464240 (Scopus ID)
Tilgjengelig fra: 2019-03-15 Laget: 2019-03-15 Sist oppdatert: 2019-08-29bibliografisk kontrollert
Saketi, S., Odelros, S., Östby, J. & Olsson, M. (2019). Experimental study of wear mechanisms of cemented carbide in the turning of Ti6Al4V. Materials, 12(7), Article ID 2822.
Åpne denne publikasjonen i ny fane eller vindu >>Experimental study of wear mechanisms of cemented carbide in the turning of Ti6Al4V
2019 (engelsk)Inngår i: Materials, ISSN 1996-1944, Vol. 12, nr 7, artikkel-id 2822Artikkel i tidsskrift (Fagfellevurdert) Published
sted, utgiver, år, opplag, sider
MDPI, 2019
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-30697 (URN)10.3390/ma12172822 (DOI)000488880300175 ()31480695 (PubMedID)2-s2.0-85071886830 (Scopus ID)
Tilgjengelig fra: 2019-09-17 Laget: 2019-09-17 Sist oppdatert: 2019-10-30bibliografisk kontrollert
Heinrichs, J., Norgren, S., Jacobson, S., Yvell, K. & Olsson, M. (2019). Influence of cemented carbide binder type on wear initiation in rock drilling – Investigated in sliding wear against magnetite rock. International journal of refractory metals & hard materials, 85, Article ID 105035.
Åpne denne publikasjonen i ny fane eller vindu >>Influence of cemented carbide binder type on wear initiation in rock drilling – Investigated in sliding wear against magnetite rock
Vise andre…
2019 (engelsk)Inngår i: International journal of refractory metals & hard materials, ISSN 0958-0611, E-ISSN 2213-3917, Vol. 85, artikkel-id 105035Artikkel i tidsskrift (Fagfellevurdert) Published
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-30696 (URN)10.1016/j.ijrmhm.2019.105035 (DOI)000490047100020 ()2-s2.0-85071543465 (Scopus ID)
Tilgjengelig fra: 2019-09-17 Laget: 2019-09-17 Sist oppdatert: 2019-10-31bibliografisk kontrollert
Saketi, S., Bexell, U., Östby, J. & Olsson, M. (2019). On the diffusion wear of cemented carbide in the turning of 316L austenitic stainless steel. Wear, 430-431, 202-213
Åpne denne publikasjonen i ny fane eller vindu >>On the diffusion wear of cemented carbide in the turning of 316L austenitic stainless steel
2019 (engelsk)Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 430-431, s. 202-213Artikkel i tidsskrift (Fagfellevurdert) 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.

Emneord
Cemented carbide, 316 L austenitic stainless steel, turning, diffusion wear, SEM, AES, ToF-SIMS
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-29660 (URN)10.1016/j.wear.2019.05.010 (DOI)
Tilgjengelig fra: 2019-03-15 Laget: 2019-03-15 Sist oppdatert: 2019-07-24bibliografisk kontrollert
Saketi, S., Odelros, S., Östby, J. & Olsson, M. (2019). Wear and wear mechanisms of cemented carbide in the turning of Ti6Al4V. Materials
Åpne denne publikasjonen i ny fane eller vindu >>Wear and wear mechanisms of cemented carbide in the turning of Ti6Al4V
2019 (engelsk)Inngår i: Materials, ISSN 1996-1944, E-ISSN 1996-1944Artikkel i tidsskrift (Fagfellevurdert) Submitted
Abstract [en]

Titanium and titanium alloys such as Ti-6Al-4V are generally considered as difficult-to-machine materials. This is mainly due to their high chemical reactivity, poor thermal conductivity and high strength, which is maintained at elevated temperatures. As a result, the cutting tool is exposed to rather extreme contact conditions resulting in plastic deformation and wear. In the present work, the mechanisms behind the crater and flank wear of uncoated cemented carbide inserts in the turning of Ti6Al4V are characterized using high resolution scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and high resolution Auger electron spectroscopy (AES).

The results show that for combinations of low cutting speeds and feeds crater and flank wear were found to be controlled by an attrition wear mechanism while for combinations of medium to high cutting speeds and feeds a diffusion wear mechanism was found to control the wear. For the latter combinations, high resolution SEM and AES analysis reveal the formation of an approximately 100 nm thick carbon depleted WC-layer at the cemented carbide/Ti6Al4V interface due to the diffusion of carbon into the adhered build-up layers of work material on the rake and flank surfaces.

Emneord
Turning, Cemented carbide, Ti6Al4V, Attrition wear, Diffusion wear, SEM, EDS
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-29658 (URN)
Tilgjengelig fra: 2019-03-15 Laget: 2019-03-15 Sist oppdatert: 2019-07-24bibliografisk kontrollert
Surreddi, K. B., Yvell, K., Norgren, S. & Olsson, M. (2018). Characterization of surface degradation and wear damage Of cemented carbide in rock drilling. In: Prof. Staffan Jacobson (Ed.), The 18th Nordic Symposium on Tribology – NORDTRIB 2018: . Paper presented at The 18th Nordic Symposium on Tribology – NORDTRIB 2018, 18-21 June 2018, Uppsala University, Uppsala, Sweden.
Åpne denne publikasjonen i ny fane eller vindu >>Characterization of surface degradation and wear damage Of cemented carbide in rock drilling
2018 (engelsk)Inngår i: The 18th Nordic Symposium on Tribology – NORDTRIB 2018 / [ed] Prof. Staffan Jacobson, 2018Konferansepaper, Oral presentation with published abstract (Annet vitenskapelig)
Abstract [en]

In this work, worn top hammer drill bit buttons after underground drifting in Granodiorite are analysed using scanning electron microscopy (SEM), Auger electron spectroscopy (AES) and electron backscatter diffraction (EBSD) to understand the dominant surface failure and wear mechanisms on the flank wear land region, i.e. the outer side of the gauge row cemented carbide buttons. SEM shows that the worn surface of the flank wear land is partly covered with islands of a thin rock material transfer layer and that the exposed cemented carbide show deformed, cracked and fragmented WC grains. AES gives that the transferred rock material is mainly located on the surface but may penetrate into cemented carbide microstructure to a depth of 1-2 WC grain diameters. Finally, EBSD reveals that the deformation of the cemented carbide in the flank wear land region is located to a thin zone, about ~10 μm in depth.

Emneord
Wire drawing; Cemented carbide; Surface degradation; Wear mechanisms
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-28028 (URN)
Konferanse
The 18th Nordic Symposium on Tribology – NORDTRIB 2018, 18-21 June 2018, Uppsala University, Uppsala, Sweden
Prosjekter
Mikrostrukturell design av hårdmetall för bergborrtillämpningar
Forskningsfinansiär
Knowledge Foundation, 20160132
Tilgjengelig fra: 2018-06-28 Laget: 2018-06-28 Sist oppdatert: 2018-06-28bibliografisk kontrollert
Heinrichs, J., Olsson, M., Almqvist, B. & Jacobson, S. (2018). Initial surface failure and wear of cemented carbides in sliding contact with different rock types. Wear, 408-409, 43-55
Åpne denne publikasjonen i ny fane eller vindu >>Initial surface failure and wear of cemented carbides in sliding contact with different rock types
2018 (engelsk)Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 408-409, s. 43-55Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The initial wear, deformation and degradation of cemented carbide in contact with different rock types are studied using a crossed cylinder sliding test. The sliding distance is limited to centimetres at a time, interrupted by successive SEM analysis. This allows for careful studies of the gradually changing microstructure of the cemented carbide during the test. Five different rock types are included; granite, metal sulphide ore, mica schist, quartzite and marble. All rock types are very different in microstructure, composition and properties. The cemented carbide grade used for the evaluation contains 6 wt% Co and fine (~ 1 µm) WC grains, a grade commonly used in rock drilling. The results show that the cemented carbide microstructure becomes altered already during the very first contact with rock. The initial wear rate and wear character is highly influenced by the rock type. The initial wear of the cemented carbide is highest against quartzite and lowest against marble.

Emneord
Cemented carbides, Deformation, Rock drilling, Sliding, Wear
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-27728 (URN)10.1016/j.wear.2018.04.017 (DOI)000436482000005 ()2-s2.0-85046810901 (Scopus ID)
Tilgjengelig fra: 2018-05-28 Laget: 2018-05-28 Sist oppdatert: 2018-07-16bibliografisk kontrollert
Surreddi, K. B., Oikonomou, C., Karlsson, P., Olsson, M. & Pejryd, L. (2018). In-situ micro-tensile testing of additive manufactured maraging steels in the SEM: Influence of build orientation, thickness and roughness on the resulting mechanical properties. La Metallurgia Italiana (3), 27-33
Åpne denne publikasjonen i ny fane eller vindu >>In-situ micro-tensile testing of additive manufactured maraging steels in the SEM: Influence of build orientation, thickness and roughness on the resulting mechanical properties
Vise andre…
2018 (engelsk)Inngår i: La Metallurgia Italiana, ISSN 0026-0843, nr 3, s. 27-33Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Selective laser melting (SLM) is frequently used additive manufacturing technique capable of producing various complex parts including thin-wall sections. However the surface roughness is a limiting factor in thin sections produced by SLM process when strength is the main criterion. In this study, the influence of build orientation, thickness and roughness on the resulting mechanical properties of as-built test samples was investigated. Various thin sheets of EN 1.2709 maraging steel built in horizontal and vertical orientations produced by SLM were investigated using in-situ micro-tensile testing in a scanning electron microscope. The mechanical strength and deformation mechanisms were analyzed and explained based on thickness and build orientation. Increased ductility was observed in thicker samples as well as in the horizontal build samples. The results illustrate the potential of the in-situ test technique and aspects important to consider in design guidelines for thin AM structures.

sted, utgiver, år, opplag, sider
ASSOC ITALIANA METALLURGIA, 2018
Emneord
SELECTIVE LASER MELTING, IN-SITU MICRO-TENSILE TESTING, BUILD ORIENTATION, DEFORMATION MECHANISM AND MARAGING STEEL
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-28114 (URN)000435488500005 ()
Tilgjengelig fra: 2018-07-05 Laget: 2018-07-05 Sist oppdatert: 2018-07-05bibliografisk kontrollert
Heinrichs, J., Olsson, M., Yvell, K. & Jacobson, S. (2018). On the deformation mechanisms of cemented carbide in rock drilling: Fundamental studies involving sliding contact against a rock crystal tip. International journal of refractory metals & hard materials, 77, 141-151
Åpne denne publikasjonen i ny fane eller vindu >>On the deformation mechanisms of cemented carbide in rock drilling: Fundamental studies involving sliding contact against a rock crystal tip
2018 (engelsk)Inngår i: International journal of refractory metals & hard materials, ISSN 0958-0611, E-ISSN 2213-3917, Vol. 77, s. 141-151Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Cemented carbide is a composite material, most commonly consisting of tungsten carbide grains in a metallic matrix of cobalt. The combination of a hard ceramic phase in a ductile metallic matrix combines high hardness and ability to withstand plastic deformation with toughness to avoid cracking and fracturing. Since these properties are very important in rock drilling, cemented carbides are frequently used in such applications. In earlier work, it was found that granite in sliding contact with considerably harder cemented carbides not only results in plastic deformation of the cemented carbide composite, but also in plastic deformation of some of the individual WC grains. The latter observation is remarkable, since even the two hardest granite constituents (quartz and feldspar) are significantly softer than the WC grains. This tendency to plastic deformation of the WC grains was found to increase with increasing WC grain size. The present investigation aims to increase the understanding of plastic deformation of cemented carbides in general, and the individual WC grains in particular, in a situation representative for the rock drilling application. The emphasis is put on explaining the seemingly paradoxical fact that a nominally softer counter material is able to plastically deform a harder constituent in a composite material. The experimental work is based on a scratch test set-up, where a rock crystal tip slides against a fine polished cemented carbide surface under well-controlled contact conditions. The deformation and wear mechanisms of the cemented carbide are evaluated on the sub-micrometer scale; using high resolution FEG-SEM, EDS, EBSD, BIB and FIB cross-sectioning. The size of the Co-pockets, together with the shape and size of WC grains, turned out to be decisive factors in determining the degree of carbide deformation. The results are discussed with respect to their industrial importance, including rock drilling.

sted, utgiver, år, opplag, sider
Elsevier, 2018
Emneord
Cemented carbides, Deformation, Quartz, Rock drilling, Sliding, Wear
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-28457 (URN)10.1016/j.ijrmhm.2018.04.022 (DOI)000445989200018 ()2-s2.0-85051820047 (Scopus ID)
Tilgjengelig fra: 2018-09-03 Laget: 2018-09-03 Sist oppdatert: 2018-10-19bibliografisk kontrollert
Olsson, M. & Surreddi, K. B. (2018). Scratch testing of cemented carbides - Influence of Co binder phase and WC grain size on surface deformation and degradation mechanisms. In: Staffan Jacobson (Ed.), Proceedings of The 18th Nordic Symposium on Tribology - Nordtrib 2018: . Paper presented at 18th Nordic Symposium on Tribology - Nordtrib 2018. Uppsala: Uppsala University
Åpne denne publikasjonen i ny fane eller vindu >>Scratch testing of cemented carbides - Influence of Co binder phase and WC grain size on surface deformation and degradation mechanisms
2018 (engelsk)Inngår i: Proceedings of The 18th Nordic Symposium on Tribology - Nordtrib 2018 / [ed] Staffan Jacobson, Uppsala: Uppsala University, 2018Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In the present study, the microstructural response of some commercial cemented carbide grades during scratchinghas been analyzed and evaluated by a number of post-test characterization techniques. The influence of Co binder phase content and WC grain size on the deformation and degradation on a WC grain size scale and on a composite scaleare evaluated. The results clearly illustrate the complexity of deformation, degradation and wear of cemented carbide and the dynamics of the diamond stylus / cemented carbide contact during the scratching event. For all cementedcarbide grades the microstructure has a strong impact on the observed degradation mechanisms and the resistance to deformation and degradation was found to increase with decreasing Co content and decreasing WC grain size.

sted, utgiver, år, opplag, sider
Uppsala: Uppsala University, 2018
Emneord
Scratch testing, Cemented carbide, Microstructure, Surface deformation, Wear
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-28042 (URN)
Konferanse
18th Nordic Symposium on Tribology - Nordtrib 2018
Forskningsfinansiär
Knowledge Foundation, 20150193
Tilgjengelig fra: 2018-06-28 Laget: 2018-06-28 Sist oppdatert: 2018-06-28bibliografisk kontrollert
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