SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "swepub ;lar1:(du);pers:(Olsson Mikael);conttype:(refereed)"

Sökning: swepub > Högskolan Dalarna > Olsson Mikael > Refereegranskat

  • Resultat 41-50 av 105
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
41.
  • Saketi, Sara, et al. (författare)
  • On the diffusion wear of cemented carbide in the turning of 316L austenitic stainless steel
  • 2019
  • Ingår i: Wear. - : Elsevier BV. - 0043-1648 .- 1873-2577. ; 430-431, s. 202-213
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
  •  
42.
  • Saketi, Sara, et al. (författare)
  • Wear behaviour of two different cemented carbide grades in turning 316 L stainless steel
  • 2018
  • Ingår i: Materials Science Forum. - : TRANS TECH PUBLICATIONS LTD. - 0255-5476 .- 1662-9752. ; 941, s. 2367-2372, s. 2367-2372
  • Tidskriftsartikel (refereegranskat)abstract
    • Cemented carbides are the most common cutting tools for machining various grades of steels. In this study, wear behavior of two different cemented carbide grades with roughly the same fraction of binder phase and carbide phase but different grain size, in turning austenitic stainless steel is investigated. Wear tests were carried out against 316L stainless steel at 180 and 250 m/mincutting speeds. The worn surface of cutting tool is characterized using high resolution scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), Auger electron spectroscopy (AES) and 3D optical profiler.The wear of cemented carbide in turning stainless steel is controlled by both chemical and mechanical wear. Plastic deformation, grain fracture and chemical wear is observed on flank and rake face of the cutting insert. In the case of fine-grained, the WC grains has higher surface contact with the adhered material which promotes higher chemical reaction and degradation of WC grains, so chemical wear resistance of the composites is larger when WC grains are larger. The hardness of cemented carbide increase linearly by decreasing grain size, therefore mechanical wear resistance of the composites is larger when WC grains are smaller.
  •  
43.
  • Saketi, Sara, et al. (författare)
  • Wear of a high cBN content PCBN cutting tool during hard milling of powder metallurgy cold work tool steels
  • 2015
  • Ingår i: Wear. - : Elsevier. - 0043-1648 .- 1873-2577. ; 332, s. 752-761
  • Tidskriftsartikel (refereegranskat)abstract
    • The wear characteristics of a high cBN content PCBN cutting tool during hard milling of two different hardened cold work tool steels have been evaluated. Post-cutting examination of the worn cutting inserts were performed using high resolution field emission gun scanning electron microscopy, energy dispersive X-ray spectroscopy, Auger electron spectroscopy and optical surface profilometry. Also, the machined work material surfaces and collected chips were characterized in order to evaluate the prevailing wear mechanisms.The results show that both flank and crater wear is controlled by continuous wear due to tribochemical reactions, adhesive wear and mild abrasive wear. Besides, the cutting inserts show a tendency to micro chipping along the cutting edge especially at higher cutting speed. The latter mechanism was also found to be dependent on type of work material. High lateral resolution Auger electron spectroscopy of the crater region show that the worn surface is covered by a thin SixOy rich tribofilm with a thickness of 50-500 nm, the tribofilm being thicker on the binder phase regions. Also, the Co-rich regions of the binder phase seem to be more tribochemically affected by the prevailing contact conditions as compared with the Wrich regions of the binder phase and the cBN phase.
  •  
44.
  • Surreddi, Kumar Babu, 1977-, et al. (författare)
  • 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
  • 2018
  • Ingår i: La Metallurgia Italiana. - : ASSOC ITALIANA METALLURGIA. - 0026-0843. ; :3, s. 27-33
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
  •  
45.
  • Sveen, Susanne, et al. (författare)
  • Scratch adhesion characteristics of PVD TiAlN deposited on high speed steel, cemented carbide and PCBN substrates
  • 2013
  • Ingår i: Wear. - : Elsevier. - 0043-1648 .- 1873-2577. ; 308:1-2, s. 133-141
  • Tidskriftsartikel (refereegranskat)abstract
    • Modern tool materials, ranging from powder metallurgical high speed steel to super hard materials such as polycrystalline cubic boron nitride and diamond, are used as cutting tools in the metal cutting industry. In order to further improve the cutting performance, these tools are frequently coated by thin, hard PVD coatings such as TiN, TiAlN, AlCrO3, etc. In order to develop and design new PVD coatings it is important to characterize the mechanical properties of the coatings and understand the coating/substrate deformation mechanisms in a tribological contact, e.g. metal cutting. For example, it is important to be aware that the mechanical properties of the substrate (tool material) have a significant impact on the practical coating adhesion and the coating failure mechanisms.In the present study scratch testing has been used in order to evaluate to increase the understanding of the mechanical response and potential coating failure modes of cathodic arc evaporated TiAlN deposited on high speed steel, cemented carbide and polycrystalline cubic boron nitride. Post-test characterization of the scratched samples using optical profilometry, scanning electron microscopy and energy dispersive X-ray spectroscopy were performed and the cohesive and adhesive surface failure mechanisms are described and related to the substrate material properties. The results clearly show that, although all substrate materials can be regarded as hard, they result in completely different coating failure mechanisms at the normal load corresponding to substrate exposure. Also, coating failure resulting in substrate exposure does not necessarily correspond to interfacial cracking resulting in adhesive fracture along the coating-substrate interface.
  •  
46.
  • Westlund, Viktoria, et al. (författare)
  • Investigation of material transfer in sliding friction-topography or surface chemistry?
  • 2016
  • Ingår i: Tribology International. - : Elsevier BV. - 0301-679X .- 1879-2464. ; 100, s. 213-223
  • Tidskriftsartikel (refereegranskat)abstract
    • To differentiate between the roles of surface topography and chemical composition on influencing friction and transfer in sliding contact, a series of tests were performed in situ in an SEM. The initial sliding during metal forming was investigated, using an aluminum tip representing the work material, put into sliding contact with a polished flat tool material. Both DLC-coated and uncoated tool steel was used. By varying the final polishing step of the tool material, different surface topographies were obtained. The study demonstrates the strong influence from nano topography of an unpolished DLC coated surface on both coefficient of friction and material transfer. The influence of tool surface chemistry is also discussed.
  •  
47.
  • Engkvist, Josefin, 1972, et al. (författare)
  • Alumina scale formation on a powder metallurgical FeCrAl alloy (Kanthal APMT) at 900-1100°C in dry O2 and in O2 + H2O
  • 2010
  • Ingår i: Oxidation of Metals. - : Springer Science and Business Media LLC. - 1573-4889 .- 0030-770X. ; 73:1, s. 233-253
  • Tidskriftsartikel (refereegranskat)abstract
    • A Rapidly Solidified Powder (RSP) metallurgical FeCrAl alloy, Kanthal APMT, was exposed in dry and humid O-2 for 72 h at 900-1,100 A degrees C. The formed oxide scales were characterized using gravimetry in combination with advanced analysis techniques (SEM, EDX, TEM, XRD, AES and SIMS). The oxide scales were at all exposures composed of two-layered alpha-Al2O3 scales exhibiting a top layer of equiaxed grains and a bottom layer containing elongated grains. A Cr-rich zone, originating in the native oxide present before exposure, separated these two layers. The top alpha-Al2O3 layer is suggested to have formed by transformation of outwardly grown metastable alumina, while the inward-grown bottom alpha-Al2O3 layer had incorporated small Zr-, Hf- and Ti-rich oxide particles present in the alloy matrix. The scale also contained larger Y-rich oxide particles. Furthermore, in the temperature range studied, the presence of water vapour accelerated alloy oxidation somewhat and affected scale morphology.
  •  
48.
  • Engkvist, Josefin, 1972, et al. (författare)
  • Oxidation of FeCrAl foils at 500-900 degrees C in dry O-2 and O-2 with 40% H2O
  • 2009
  • Ingår i: Materials at High Temperatures. - 0960-3409 .- 1878-6413. ; 26:2, s. 199-210
  • Tidskriftsartikel (refereegranskat)abstract
    • High temperature resistant FeCrAl alloys are frequently used in high temperature applications Such as heating elements and metal based catalytic converter bodies. When exposed to high temperatures an adherent, slowly growing, dense aluminium oxide layer forms on the surface, which protects the underlying alloy from severe degradation. The composition, structure and properties of the formed oxide layer are strongly dependent on the alloy composition, temperature and oxidation environment. In this study, the Sandvik 0C404 FeCrAl alloy, in the form of 50 mu m thick foils, was exposed isothermally in the temperature range 500-900 degrees C for 168 hours in dry O-2 and in O-2 with 40 vol.% H2O. The surface morphology, composition and microstructure of the grown oxide scales were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), grazing incidence X-ray diffraction (GI-XRD), Auger electron spectroscopy (AES), and time of flight secondary ion mass spectrometry (TOF-SIMS). The oxidation process was faster at 900 degrees C than at 500 and 700 degrees C. At 500 degrees C a thin (10-20 nm) mixed oxide of Fe, Cr and Al was formed. Exposure at 700 degrees C resulted ill a similar (40-50 nm) duplex oxide, in both dry O-2 and in O-2 With 40 vol.% H2O. These oxide scales consisted of all inner and an outer relatively pure alumina separated by a Cr-rich band. This type of duplex oxide scale also formed at 900 degrees C with a thin inward growing alpha-Al2O3 at the oxide/metal interface and an outward growing layer outside a Cr-rich band. However, at 900 degrees C the Outward growing layer showed two types of oxide morphologies; a thin smooth base oxide and a much thicker nodular oxide grown on top of substrate ridges. In dry O-2 atmosphere, the main part of this outward growing layer had transformed to alpha-Al2O3. Only in the outer part of the thick oxide nodules, metastable alumina was found. When exposed in the presence of water vapour the main pall of the metastable alumina remained untransformed.
  •  
49.
  • Hatami, Sepehr, 1981, et al. (författare)
  • Tribological properties of powder metallurgical tool steels used in powder compaction pressing dies
  • 2011
  • Ingår i: Lubrication Science. - : Wiley. - 0954-0075 .- 1557-6833. ; 23:3, s. 139-152
  • Tidskriftsartikel (refereegranskat)abstract
    • The tribological properties of two powder metallurgical (PM) tool steels, high and low nitrogen containing, are investigated by means of three different wear tests: ball-on-disc, rubber wheel and scratch test. The ball-on-disc tests showed two distinct friction curves corresponding to each material. In order to simulate the tribosystem existing in metal powder compaction dies, the rubber wheel and the scratch test were modified. The rubber wheel test was performed using ferrous powder instead of sand, and scratch testing was carried out by sliding a powder compact over the tool steels. The scratch tests indicated a higher steady-state coefficient of friction for the low nitrogen containing PM steel as compared with the high nitrogen containing alloy. Additionally, the results from the rubber wheel tests were in agreement with industrial experiences, showing the low nitrogen containing tool steel to suffer from severe galling. Copyright (C) 2011 John Wiley & Sons, Ltd.
  •  
50.
  • Bejjani, Roland, et al. (författare)
  • An Experimental and Finite Element Approach for a Better Understanding of Ti-6Al-4V Behavior When Machining under Cryogenic Environment
  • 2021
  • Ingår i: Materials. - : MDPI AG. - 1996-1944 .- 1996-1944. ; 14:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Due to increasing demand in manufacturing industries, process optimization has become a major area of focus for researchers. This research optimizes the cryogenic machining of aerospace titanium alloy Ti-6Al-4V for industrial applications by studying the effect of varying the nozzle position using two parameters: the nozzle's separation distance from the tool-chip interface and its inclination angle with respect to the tool rake face. A finite element model (FEM) and computational fluid dynamics (CFD) model are used to simulate the cryogenic impingement of cryogenic carbon dioxide on the tool-workpiece geometry. Experiments are conducted to evaluate cutting forces, tool wear, and surface roughness of the workpiece, and the results are related to the CFD and FEM analyses. The nozzle location is shown to have a significant impact on the cutting temperatures and forces, reducing them by up to 45% and 46%, respectively, while the dominant parameter affecting the results is shown to be the separation distance. Cryogenic machining is shown to decrease adhesion-diffusion wear as well as macroscopic brittle chipping of the cutting insert compared to dry turning, while the workpiece surface roughness is found to decrease by 44% in the case of cryogenic machining.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 41-50 av 105
Typ av publikation
tidskriftsartikel (76)
konferensbidrag (29)
Typ av innehåll
Författare/redaktör
Jacobson, Staffan (14)
Carlsson, Per (9)
Nilsson, Maria (4)
Surreddi, Kumar Babu ... (3)
Johansson, M (2)
Ståhl, J. E. (2)
visa fler...
Johansson, Lars-Gunn ... (2)
Jacobson, Staffan, 1 ... (2)
Karlsson, Patrik, 19 ... (2)
Svensson, Jan-Erik, ... (2)
Nyborg, Lars, 1958 (2)
Pejryd, Lars, 1955- (2)
Norgren, Susanne (2)
Canovic, Sead, 1979 (2)
M'Saoubi, R. (1)
Gordon, S (1)
Jacobson, S (1)
Bengtsson, M (1)
Wiklund, Urban (1)
Samuelsson, J (1)
Andersson, J (1)
Thierry, Dominique (1)
Lindgren, Lars-Erik (1)
Liu, Fang (1)
Karlsson, E (1)
Karlsson, Erik (1)
Joshi, Shrikant V., ... (1)
Björklund, Stefan, 1 ... (1)
Johansson, Mats (1)
M’Saoubi, Rachid (1)
Lundberg, M (1)
Götlind, Helena, 197 ... (1)
Berglund, T (1)
Hogmark, Sture (1)
Gelius, Ulrik (1)
Almqvist, Bjarne (1)
Pejryd, Lars (1)
Surreddi, Kumar Babu (1)
Andersson, J. M. (1)
Hatami, Sepehr, 1981 (1)
Liu, Fang, 1975 (1)
Hellström, Kristina (1)
Johansson, Mats K. G ... (1)
Berger, R (1)
Nilsson, Malin (1)
Gunnarsson, S. (1)
Halvarsson, Mats, 19 ... (1)
Oikonomou, Christos (1)
Mahade, Satyapal, 19 ... (1)
Bengtsson, Maria (1)
visa färre...
Lärosäte
Uppsala universitet (34)
Chalmers tekniska högskola (4)
Örebro universitet (3)
Kungliga Tekniska Högskolan (2)
Linköpings universitet (2)
visa fler...
Luleå tekniska universitet (1)
Stockholms universitet (1)
Högskolan Väst (1)
RISE (1)
visa färre...
Språk
Engelska (104)
Odefinierat språk (1)
Forskningsämne (UKÄ/SCB)
Teknik (86)
Naturvetenskap (3)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy