Friction-induced work hardening of cobalt-base hardfacing deposits for hot forging tools

Fouilland, Laurence; Mansori, Mohamed El; Massaq, A.

doi:10.1016/j.jmatprotec.2008.07.039

Cited by 31 publications

(23 citation statements)

References 17 publications

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“…1. Phase diagram of stellite 6 used in the current study [20]. of the solidification, co-solidification of eutectic solid solution and eutectic (Cr,Co) 7 C 3 carbides occurs [16].…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and wear behavior of stellite 6 cladding on 17-4 PH stainless steel

Gholipour

Shamanian

Ashrafizadeh

2011

Journal of Alloys and Compounds

135

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“…1. Phase diagram of stellite 6 used in the current study [20]. of the solidification, co-solidification of eutectic solid solution and eutectic (Cr,Co) 7 C 3 carbides occurs [16].…”

Section: Resultsmentioning

confidence: 99%

“…The dilution of stellite by iron causes increased toughness, reduced hardness and corrosion resistance in many corrosive environments [18,19]. It also causes reduced wear resistance because of increase in cobalt lattice stacking fault energy [20]. Therefore, the application of an inter-layer is usually suggested to minimize the dilution [14].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and wear behavior of stellite 6 cladding on 17-4 PH stainless steel

Gholipour

Shamanian

Ashrafizadeh

2011

Journal of Alloys and Compounds

135

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“…The stacking fault energy (SFE) of Stellites is low, between 10 and 50 mJ/m 2 and is influenced by the alloying elements [6,7]: Ni, C and Fe tend to increase the SFE and so to stabilize the FCC phase, while Cr, Mo and W tend to stabilize the HCP phase and so to promote the SIT. Plastic strain of Stellites leads to an important work-hardening, this work-hardening ability of Stellites increases with alloying elements reducing the SFE [8]. During the hardfacings deposition process, a part of the substrate is melted and intermixed with the Stellites to insure a good metallurgical bonding.…”

Section: Introductionmentioning

confidence: 99%

Plastic strain of cobalt-based hardfacings under friction loading

Cabrol

Boher

Vidal

et al. 2015

Wear

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Hardfacing Plastic strain High load tribological test Work-hardening Strain-induced phase transformation a b s t r a c t Aeronautic forging dies are subjected to very high loads and temperatures for a long contact time between the pre-heated parts and dies. Cobalt-based hardfacings are commonly deposited on dies and their main wear mechanism is large plastic deformation of the die radii.This paper deals with the wear damage mechanisms of three different cobalt-based hardfacings: Stellite 21 deposited by a MIG process, Stellite 21 and Stellite 6 deposited by a LASER process. The tribological tests are carried out on a high load Ring on Disc tribometer at room temperature. The postmortem investigations are undertaken by SEM observations, micro-hardness measurements as well as by X-ray diffraction analyses.Results show that the increase of the hardness, in order to improve the wear behaviour, can be achieved by a higher carbon content and by a lesser iron dilution that depends on the deposition process. A very important work-hardening, up to 90%, is also observed under sliding conditions and a relationship is established between the increase of the micro-hardness and the plastic strain level. Two different plastic strain mechanisms are observed. For high (MIG) or low (LASER) iron dilution levels, the plastic strain causes respectively a reorientation of grains or a FCC to HCP phase transformation; the latter being associated with a lower friction coefficient.

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“…Although Alloy A had a lower hardness than tool steel, it had a very low wear rate. As can be seen in Table 4, it reached a very high hardness level after the wear test since cold work and oxide formation occurred [25][26][27][28]. It is known that when oxides are present at high temperatures they play the role of a solid lubricant by forming glazed surfaces.…”

Section: Selection Of Welding Electrodelaboratory Studies and Numericmentioning

confidence: 97%

Performance of Fe-based hardfacings on hot forging die: experimental, numerical and industrial studies

Saklakoğlu¹,

İrizalp²,

Doğan³

et al. 2018

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This paper is an investigation into the use of Fe-based alloys as part of wear resistant hardfacing materials in AISI 1.2714 tool steel. Four different weld hardfacing alloys were deposited on 1.2714 steel substrates using tungsten inert gas welding (TIG) process. Wear tests were carried out using a pin-on-disc wear tester at room temperature. Microhardness and micrographs of the weld overlays were obtained. High-temperature properties were estimated by numerical analysis. The phases of the hardfacings were obtained by XRD and also estimated by numerical analysis. The results from the laboratory tests were then compared with the results obtained from field studies. The results showed that some Fe-based alloys improved dies lifetime; others created poor surfaces. A Fe-based hardfacing alloy D which included high C with Cr, W, Mo had the best wear behavior among the weld overlays.K e y w o r d s : hardfacing, Fe-based alloy, JmatPro, die failure mode, hot forging performance tests

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Friction-induced work hardening of cobalt-base hardfacing deposits for hot forging tools

Cited by 31 publications

References 17 publications

Microstructure and wear behavior of stellite 6 cladding on 17-4 PH stainless steel

Microstructure and wear behavior of stellite 6 cladding on 17-4 PH stainless steel

Plastic strain of cobalt-based hardfacings under friction loading

Performance of Fe-based hardfacings on hot forging die: experimental, numerical and industrial studies

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