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Heinrichs, Jannica
Publikasjoner (10 av 57) Visa alla publikasjoner
Heinrichs, J., Norgren, S., Jacobson, S. & Olsson, M. (2019). Cemented carbide wear initiation in sliding contact with iron ore. In: Proceedings of 2nd Sweden-China Symposium on Tribology: . Paper presented at 2nd Sweden-China Symposium on Tribology.
Åpne denne publikasjonen i ny fane eller vindu >>Cemented carbide wear initiation in sliding contact with iron ore
2019 (engelsk)Inngår i: Proceedings of 2nd Sweden-China Symposium on Tribology, 2019Konferansepaper, Oral presentation with published abstract (Annet vitenskapelig)
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-392921 (URN)
Konferanse
2nd Sweden-China Symposium on Tribology
Tilgjengelig fra: 2019-09-11 Laget: 2019-09-11 Sist oppdatert: 2019-09-11
Heinrichs, J., Norgren, S., Jacobson, S. & Olsson, M. (2019). Influence of cemented carbide binder type on wear initiation in rock drilling – investigated in sliding wear against magnetite rock. Paper presented at International Conference on the Science of Hard Materials, March 25-29, 2019, Khao Lak, Thailand. 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
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
Abstract [en]

Cemented carbides, containing hard WC grains in a ductile Co binder, are commonly used as the rock crushing part of rock drills. They generally work well and show moderate and gradual wear in rock drilling applications. However, due to health issues, an alternative to Co is sought for, which will not compromise the performance. In the present work, the initiation of wear of cemented carbides with the two alternative binders Ni and Fe are investigated and compared to the common Co containing material in a sliding test. The sliding counterpart is magnetite, representing a rock type generally causing slow wear of the cemented carbides.

The results show that magnetite is immediately transferred to the cemented carbide thus forming thin layers, mainly on top of the binder, and WC grain fragments are removed. The chain of events is similar irrespective of binder, however the severity shows a strong dependence. The cemented carbide grade with the Ni binder shows relatively rapid wear initiation, compared to that with the Fe binder that shows moderate initiation and that with Co that is barely worn at all.

HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-392918 (URN)10.1016/j.ijrmhm.2019.105035 (DOI)000490047100020 ()
Konferanse
International Conference on the Science of Hard Materials, March 25-29, 2019, Khao Lak, Thailand
Forskningsfinansiär
Knowledge Foundation, 20150193
Tilgjengelig fra: 2019-09-11 Laget: 2019-09-11 Sist oppdatert: 2020-02-24bibliografisk kontrollert
Olander, P. & Heinrichs, J. (2019). Initiation and propagation of tool wear in turning of titanium alloys - Evaluated in successive sliding wear test. Paper presented at 22nd International Conference on Wear of Materials (WOM), APR 14-18, 2019, Miami, FL. Wear, 426-427(Part B), 1658-1666
Åpne denne publikasjonen i ny fane eller vindu >>Initiation and propagation of tool wear in turning of titanium alloys - Evaluated in successive sliding wear test
2019 (engelsk)Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 426-427, nr Part B, s. 1658-1666Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Titanium alloys are known to cause significant crater wear on the rake face of cutting inserts when exposed to the fresh chip during cuffing, limiting the lifetime of the tool. Previous studies have shown that wear surfaces on inserts has a crater filled with transferred titanium. The WC grains in the bottom of the crater are depleted of carbon, resulting in a top surface rich in tungsten. To further investigate the initiation of wear in the present study a sliding test, previously developed to imitate the conditions on the rake face during cuffing, was used. The test was performed in interrupted mode, allowing intermediate SEM studies of the tool surface, while successively increasing the sliding distance. A cemented carbide grade, H13A, commonly used for cutting titanium alloys, and titanium alloy Ti6Al4V were used as model materials. The results from the sliding tests showed that both transfer of titanium and wear of the cemented carbide composite occur simultaneously. The wear is shallow and occurs on a very small scale, which adds up to a large crater, which is continuously filled with a smooth layer of titanium.

sted, utgiver, år, opplag, sider
ELSEVIER SCIENCE SA, 2019
Emneord
Sliding test, Titanium alloy, Ti6Al4V, Cemented carbide, Wear mechanism
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-382824 (URN)10.1016/j.wear.2019.01.077 (DOI)000464585200077 ()
Konferanse
22nd International Conference on Wear of Materials (WOM), APR 14-18, 2019, Miami, FL
Tilgjengelig fra: 2019-05-06 Laget: 2019-05-06 Sist oppdatert: 2019-05-06bibliografisk kontrollert
Olander, P. & Heinrichs, J. (2019). Initiation and propagation of tool wear in turning of titanium alloys – evaluated in successive sliding wear test. In: Proceedings of Wear of Materials Conference, Miami, Florida, USA: . Paper presented at Wear of Materials Conference, April 14-18, 2019, Miami, Florida, USA.
Åpne denne publikasjonen i ny fane eller vindu >>Initiation and propagation of tool wear in turning of titanium alloys – evaluated in successive sliding wear test
2019 (engelsk)Inngår i: Proceedings of Wear of Materials Conference, Miami, Florida, USA, 2019Konferansepaper, Oral presentation with published abstract (Annet vitenskapelig)
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-392923 (URN)
Konferanse
Wear of Materials Conference, April 14-18, 2019, Miami, Florida, USA
Tilgjengelig fra: 2019-09-11 Laget: 2019-09-11 Sist oppdatert: 2019-09-11
Hiroko, M., Heinrichs, J., Wiklund, U., Kawamura, S. & Jacobson, S. (2019). Initiation wear of cemented carbide tools used in copper processing - evaluated in sliding contact. In: Proceedings of International Conference on the Science of Hard Materials, Khao Lak, Thailand: . Paper presented at International Conference on the Science of Hard Materials, March 25-29, 2019, Khao Lak, Thailand.
Åpne denne publikasjonen i ny fane eller vindu >>Initiation wear of cemented carbide tools used in copper processing - evaluated in sliding contact
Vise andre…
2019 (engelsk)Inngår i: Proceedings of International Conference on the Science of Hard Materials, Khao Lak, Thailand, 2019Konferansepaper, Oral presentation with published abstract (Annet vitenskapelig)
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-392919 (URN)
Konferanse
International Conference on the Science of Hard Materials, March 25-29, 2019, Khao Lak, Thailand
Tilgjengelig fra: 2019-09-11 Laget: 2019-09-11 Sist oppdatert: 2019-09-11
Heinrichs, J., Mikado, H., Kawakami, A., Wiklund, U., Kawamura, S. & Jacobson, S. (2019). Wear mechanisms of WC-Co cemented carbide tools and PVD coated tools used for shearing Cu-alloy wire in zipper production. Wear, 420, 96-107
Åpne denne publikasjonen i ny fane eller vindu >>Wear mechanisms of WC-Co cemented carbide tools and PVD coated tools used for shearing Cu-alloy wire in zipper production
Vise andre…
2019 (engelsk)Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 420, s. 96-107Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

To form the individual elements, that together form a zipper, a pre-formed Cu-alloy wire is sheared using cemented carbide tools. The wear caused by the relatively soft copper alloy on the much harder tool is generally quite slow. However, millions of elements are to be sheared so eventually the wear becomes unacceptable and the tool needs to be exchanged. To improve product quality, as well as minimize down time and material consumption, the tool life needs to be prolonged. To achieve this the wear process needs to be better understood. Uncoated tools used for an increasing number of shearing events have been studied in detail using high resolution SEM and EDS, to map the propagating wear and get an insight into the wear mechanisms. Transfer of material from the Cu-alloy to the tool occurs and the wear is highly concentrated to specific areas. This wear occurs on a very fine scale, limited to within individual WC grains at each event. Tools coated with PVD CrC and PVD CrN have been studied for comparison with the uncoated cemented carbide. Both coatings successfully protect the cemented carbide tool from wear, however occasional flaking occurs and then the cemented carbide becomes exposed and subsequently worn. The differences in performance and wear mechanisms between the uncoated and coated tools are discussed, with focus on the capability of the coatings to prolong the tool life.

Emneord
Cemented carbide, Cutting, Shearing, Wear, Cu-alloy
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-375796 (URN)10.1016/j.wear.2018.12.075 (DOI)000456176100009 ()
Tilgjengelig fra: 2019-02-15 Laget: 2019-02-15 Sist oppdatert: 2019-02-15bibliografisk kontrollert
Roizard, X., Heinrichs, J., Buteri, A., Jacobson, S., Borgeot, M., Carpentiar, L., . . . Lallemand, F. (2018). Friction behavior of ferritic stainless steel in a strongly diluted alcohol solution of alkylphosphonic acid. Paper presented at 17th Nordic Symposium on Tribology (NORDTRIB), JUN 14-17, 2016, Hameenlinna, FINLAND. Tribology International, 118, 465-473
Åpne denne publikasjonen i ny fane eller vindu >>Friction behavior of ferritic stainless steel in a strongly diluted alcohol solution of alkylphosphonic acid
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2018 (engelsk)Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 118, s. 465-473Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The present study investigates the potential for using this more environmentally friendly lubrication at an industrial scale forming of stainless steel. Against this background we analyze the characteristics of the tribofilm formed on a stainless steel surface during sliding experiments performed in solutions containing alkylphosphonic acids, under various contact conditions. Specific tribological tests were designed to analyze the dynamics of the lubricating mechanism. It was found that both the grafting of molecules and the transformation of these into an efficient tribofihn are quick processes, irrespective of substrate roughness or contact pressure, systematically leading to low friction coefficient.

Emneord
Stainless steel, Forming, Low friction, Phosphonic acids
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-343657 (URN)10.1016/j.triboint.2017.04.027 (DOI)000423004700047 ()
Konferanse
17th Nordic Symposium on Tribology (NORDTRIB), JUN 14-17, 2016, Hameenlinna, FINLAND
Tilgjengelig fra: 2018-05-09 Laget: 2018-05-09 Sist oppdatert: 2018-05-09bibliografisk 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.

HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-351006 (URN)10.1016/j.wear.2018.04.017 (DOI)000436482000005 ()
Forskningsfinansiär
Knowledge Foundation, 20150193
Tilgjengelig fra: 2018-05-17 Laget: 2018-05-17 Sist oppdatert: 2018-09-12bibliografisk 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.

HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-363321 (URN)10.1016/j.ijrmhm.2018.04.022 (DOI)000445989200018 ()
Forskningsfinansiär
Knowledge Foundation
Tilgjengelig fra: 2018-10-16 Laget: 2018-10-16 Sist oppdatert: 2018-11-28bibliografisk kontrollert
Westlund, V., Heinrichs, J. & Jacobson, S. (2018). On the Role of Material Transfer in Friction Between Metals: Initial Phenomena and Effects of Roughness and Boundary Lubrication in Sliding Between Aluminium and Tool Steels. Tribology letters, 66(3), Article ID 97.
Åpne denne publikasjonen i ny fane eller vindu >>On the Role of Material Transfer in Friction Between Metals: Initial Phenomena and Effects of Roughness and Boundary Lubrication in Sliding Between Aluminium and Tool Steels
2018 (engelsk)Inngår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 66, nr 3, artikkel-id 97Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In the absence of a lubricant, the friction we measure in sliding contact between metals is typically high and quite erratic, with rapid fluctuations. If we filter out these rapid fluctuations, we can typically also notice slower trends, which can lead to quite dramatic friction changes. Unless careful studies are performed, the cause to this behaviour cannot be understood. How come a material couple cannot be characterised with a specific coefficient of friction? The present paper sets out to add understanding to this area, by conduction and analysing an experimental series involving sliding between a needle-like aluminium tip against tool steel flats. The load is high enough to cause substantial plastic deformation of the aluminium needle; its tip becomes formed by the contact against the tool steel. These small-scale, low sliding distance tests facilitate detailed studies of the initial stages of various friction trends, and the effects of initial surface roughness and shifts of this roughness caused by material transfer between the sliding surfaces. Specifically, the effects on the transfer and friction behaviour from presence or absence of a boundary lubricant film and atmospheric oxygen were studied. It was found that very smooth sliding surfaces can offer low-friction conditions for these metal types. However, the smooth sliding interface is very fragile. In all unlubricated cases tested, it very rapidly (in less than a few mm sliding) became ruined due to transfer, and the friction level correspondingly increased. The boundary lubricant could only offer low friction in cases where the flat steel surface was very smooth. The lubricant also facilitated smoothening of transferred aluminium. As long has been well known, boundary lubrication films typically do not totally hinder direct metallic contact in solid to solid contact. The present results strengthen this view and further suggests that in these direct contacts one of the major friction reducing effects of the lubricant is to efficiently limit transfer, which otherwise acts to make the sliding surface rough.

sted, utgiver, år, opplag, sider
SPRINGER/PLENUM PUBLISHERS, 2018
Emneord
Friction, Roughness, Material transfer, Lubrication, Friction fundamentals
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-360176 (URN)10.1007/s11249-018-1048-4 (DOI)000437046400001 ()
Forskningsfinansiär
Swedish Research Council, 621-2013-5858
Tilgjengelig fra: 2018-09-12 Laget: 2018-09-12 Sist oppdatert: 2018-09-12bibliografisk kontrollert
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