| 1. |
- Bravo, L, et al.
(författare)
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- 2021
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swepub:Mat__t
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| 2. |
- Tabiri, S, et al.
(författare)
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- 2021
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swepub:Mat__t
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| 3. |
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| 4. |
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| 5. |
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| 6. |
- Bakshi, S. Das, et al.
(författare)
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Dry rolling/sliding wear of nanostructured bainite
- 2014
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Ingår i: Wear. - : Elsevier BV. - 0043-1648 .- 1873-2577. ; 316:1-2, s. 70-78
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Tidskriftsartikel (refereegranskat)abstract
- The abrasive wear of carbide-free bainitic steel under dry rolling/sliding conditions has been studied. It is demonstrated that this nanostructure, generated by isothermal transformation at 200 °C, has a resistance to wear that supersedes that of other carbide-free bainitic steels transformed at higher temperatures. The experimental results, in combination with a theoretical analysis of rolling/sliding indicates that under the conditions studied, the role of sliding is minimal, so that the maximum shear stresses during contact are generated below the contact surface. Thus, the hardness following testing is found to reach a maximum below the contact surface. The fine scale and associated strength of the structure combats wear during the running-in period, but the volume fraction, stability and morphology of retained austenite plays a significant role during wear, by work-hardening the surface through phase transformation into very hard martensite
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| 7. |
- Bakshi, S. Das, et al.
(författare)
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Dry rolling/sliding wear of nanostructured pearlite
- 2015
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Ingår i: Materials Science and Technology. - 0267-0836 .- 1743-2847. ; 31:14, s. 1735-1744
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Tidskriftsartikel (refereegranskat)abstract
- The dry rolling-sliding wear behaviour of pearlite that has an interlamellar spacing of just 85 nm has been characterised. Its wear resistance is found to be comparable to that of much harder bainitic steels. Microstructural observations indicate that there is substantial plastic deformation of both ferrite and cementite components of pearlite in the vicinity of the wear surface. Plasticity is not expected from Hertzian analysis that assumes a smooth contact surface. Instead, it is likely to be a consequence of exaggerated stresses due to surface roughness. The material remains ductile to shear strains in the order of 4. Diffraction data indicate that the coherent domain size is reduced to about half the interlamellar spacing and that some of the cementite may dissolve and contribute to the expansion of the lattice parameter of ferrite
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| 8. |
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| 9. |
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| 10. |
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| 11. |
- Hernandez, Sinuhe, et al.
(författare)
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High temperature friction and wear mechanism map for tool steel and boron steel tribopair
- 2014
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Ingår i: Tribology - Materials, Surfaces & Interfaces. - 1751-5831 .- 1751-584X. ; 8:2, s. 74-84
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Tidskriftsartikel (refereegranskat)abstract
- Tribological systems working under severe conditions like high pressures, sliding velocities and temperatures are subjected to different phenomena such as wear, oxidation and changes in mechanical properties. In many cases, there are several mechanisms occurring simultaneously.The predominating type(s) of wear mechanism(s) presented will depend on the materials in contact, operating parameters and surrounding environment. In this work, high temperature tribological studies of boron steel sliding against tool steel were conducted using a pin-on-disc machine under unlubricated conditions at five different temperatures ranging from 25 to 400C, three different loads: 25, 50 and 75 N (contact pressures of 2, 4 and 6 MPa respectively) and a sliding speed of 0.2 ms-1. Scanning electron microscopy/energy dispersive spectroscopy and X-ray techniques were used for analysing the resulting damage and tribolayers of the worn surfaces. Additionally, hardness measurements were carried out in a special hot hardness rig in the same temperature range as that used in pin-on-disc tests. The results have shown that for a given load, the wear rate of boron steel decreased as the temperature increased, reaching itslowest value at 400C at 50 N. In the case of the tool steel, it could be observed that at 200C and above, the wear rate decreased as the load increased. This behaviour is consistent with the formation of a protective oxidised layer initiated at 100C. At higher temperatures, such layers become more pronounced. The obtained data were finally used to construct a friction and wear mechanism map for this material pair that takes temperature and pressure into account.
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| 12. |
- Hiratsuka, K., et al.
(författare)
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Effect of reciprocal sliding on severe-mild wear transition
- 2005
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Ingår i: Proceedings of the World Tribology Congress III - 2005. - New York : American Society of Mechanical Engineers. ; , s. 439-449
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Konferensbidrag (refereegranskat)abstract
- It is well known that adhesive wear is strongly dependent on load, sliding velocity, temperature and several other operating parameters. Besides these parameters, test configuration and type of motion also significantly affect the wear mode. For example, severe-mild wear transition is strongly dependent on the orientation of a test rig and the possibility of retention of wear particles on rubbing surface. It has earlier been shown that the retention of mild wear particles is crucial for severe-mild wear transition [1].
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| 13. |
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| 14. |
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| 15. |
- Torres, Hector, et al.
(författare)
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The tribology of Ag/MoS2-based self-lubricating laser claddings for high temperature forming of aluminium alloys
- 2020
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Ingår i: Wear. - : Elsevier. - 0043-1648 .- 1873-2577. ; 442
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Tidskriftsartikel (refereegranskat)abstract
- In recent years, the use of aluminium alloys in the automotive industry has gained significant attention due to their specific strength, corrosion resistance and recyclability. However, their forming at high temperature in processes like hot stamping is challenging due to the poor tribological behaviour of aluminium alloys, which is the source of severe adhesive wear and a poor surface quality of the finished product.In an effort to overcome these tribological problems, iron- and nickel-based self-lubricating laser claddings with the addition of solid lubricants such as silver and molybdenum disulfide have been evaluated under conditions representative of hot stamping against the aluminium alloy AA6082. It has been found that self-lubricating claddings decrease friction and counter body wear at high temperatures compared to alloys commonly used in forming tools such as grade 1.2367 steel. Furthermore, nickel-based self-lubricating claddings have shown a better tribological behaviour than their iron-based counterparts, due to the formation of a nickel-based sulfide layer on the counter body. It is thus expected that the implementation of self-lubricating claddings can improve the quality of the final product while reducing the need for added lubricant during the hot stamping of aluminium alloys.
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| 16. |
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| 17. |
- Yonehara, M., et al.
(författare)
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Proposal of Biomimetic Tribological System to Control Friction Behavior under Boundary Lubrication by Applying 3D Metal Printing Process
- 2018
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Ingår i: Tribology Online. - : Japanese Society of Tribologists. - 1881-218X .- 1881-2198. ; 13:1, s. 8-14
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Tidskriftsartikel (refereegranskat)abstract
- A new concept was proposed as biomimetic tribological (BMT) system by using three-dimensional (3D) printing process. The BMT had a lubricant supply path (LSP) beneath the sliding surface. The tribological properties could be actively controlled by directly supplying lubricant additives (anti-wear additive and friction modifier) alone to the sliding surface through the LSP during a friction process. To confirm the effectiveness of the LSP surface for improving the tribological performance under boundary lubrication, friction tests were conducted on a plate specimen with a lubricant supply path that was manufactured by a 3D metal printer. Experimental results suggest that the LSP surface system was more effective for friction reduction than a conventional system, and it offered an effective way to actively control the tribological performance under boundary lubrication.
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