A Wear Damage Assessment of High Temperature Forging Tool

Abstract:

High temperature forging tools are highly damaged by wear shearing under cyclic loading which reduces the life of tools. In real conditions, depending upon the tool areas, the level of wear can change. The surfaces of tools can be treated by cobalt-based hardfacing using different welding processes. This study focuses on tribological damages of Stellite 21 deposited by MIG process. Wear tests are carried out at room and high temperature on a ring on disc tribometer under high normal load. Different testing conditions are examined. The surface plastic strain due to the friction shear stresses is demonstrated by different methods like SEM observations, micro-hardness measurements and XRD analyses. More particularly, it is shown that the initial (200) crystallographic preferred orientation due to the welding process is modified into (111) crystallographic preferred orientation due to shear stresses regardless the loading. Moreover, a relationship between the gradient of the plastic shear strain at the friction subsurface and the level of the micro-hardness measurement has been established. In regard of the results, when the shear strain exceeds a threshold, the micro-hardness measurement is stabilised. The ultimate value could be induced by the stacking fault energy that is considered as weak in Stellites.

• Periodical: Advanced Materials Research (Volumes 966-967)
• Pages: 103-110
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.966-967.103
• Online since: June 2014
• Authors: Elodie Cabrol, Christine Boher*, Vanessa Vidal, Farhad Rezai-Aria, Fabienne Touratier
• Keywords: Hardfaced Hot Forging Die, MIG Welding Process, Plastic Deformation, Stellite 21, Texture, Tribological Test

References

[1] Atamert, S.; Bhadeshia, H.K.D.H.: Comparison of the Microstructures and Abrasive Wear Properties of Stellite Hardfacing Alloys Deposited by Arc Welding and Laser Cladding, Metallurgical Transactions A, 1989, 20(6), p.1037–1054.

DOI: 10.1007/bf02650140

[2] De Mol Van Otterloo, J.L.; De Hosson J. TH. M. : Microstructural features and mechanical properties of a cobalt-based laser coating, Acta Materilia, 1997, 45(3), pp.1225-1236.

DOI: 10.1016/s1359-6454(96)00250-9

[3] Radu, I.; Li, D.Y.; Llewellyn, R.: Tribological behavior of Stellite 21 modified with yttrium, Wear, 2004, 257(11), pp.1154-1166.

DOI: 10.1016/j.wear.2004.07.013

[4] Shin, J.C.; Doh, J.M.; Yoon, J.K.; Lee, D.Y.; Kim, J.S.: Effect of molybdenum on the microstructure and wear resistance of cobalt-base Stellite hardfacing alloys, Surface and Coatings Technology, 2003, 166(2-3), p.117–126.

DOI: 10.1016/s0257-8972(02)00853-8

[5] Fouilland, L.; El Mansori, M.; Gerland, M.: Role of welding process energy on the microstructural variations in a cobalt base superalloy hardfacing, Surface and Coatings Technology, 2007, 201(14), p.6445–6451.

DOI: 10.1016/j.surfcoat.2006.12.020

[6] Persson, D. H. E.: On the Mechanisms behind the Tribological Performance of Stellites, Digital Comprehensive Summaries of Uppsala dissertations from the Faculty of Science and technology 129, (2005).

[7] Persson, D. H. E.; Jacobson, S.; Hogmark, S.: Antigalling and low friction properties of a laser processed Co-based material, Journal of laser applications, 2003, 15(2), pp.115-119.

DOI: 10.2351/1.1514218

[8] Kashani, H.; Amadeh, A.; Ohadizadeh, A.: Effect of temperature on the strain induced γàε phase transformation in Stellite 21 during wear test, Materials Science and Engineering A, 2006, 435-436, pp.474-477.

DOI: 10.1016/j.msea.2006.07.022

[9] Kashani, H.; Sadeghi Laridjani, M.; Amadeh, A.; Khodagholi, M.; Ahmadzadeh, S.; The influence of volumetric dilution on the strain induced γ→ɛ martensitic transformation in GTAW processed Co–Cr–Mo alloy, Materials Science and Engineering A, 2008, 478(1-2), p.38.

DOI: 10.1016/j.msea.2007.05.061

[10] Huang, P.; López, H.F.: Strain induced ε-martensite in a Co-Cr-Mo alloy: grain size effects, Materials Letters, 1999, 39, pp.244-248.

DOI: 10.1016/s0167-577x(99)00021-x

[11] Bhansali, K.J.; Miller, A.E.: The role of stacking fault energy on galling and wear behavior, Wear, 1982, 75(2), pp.241-252.

DOI: 10.1016/0043-1648(82)90151-x

[12] Fouilland, L.; El Mansori, M.; Massaq, A.: Friction-induced work hardening of cobalt-base hardfacing deposits for hot forging tools, Journal of Materials Processing Technology, 2009, 209(7), p.3366–3373.

DOI: 10.1016/j.jmatprotec.2008.07.039

[13] Kashani, H.; Amadeh, A.; Ghasemi, H.M.: Room and high temperature wear behaviors of nickel and cobalt base weld overlay coatings on hot forging dies, Wear, 2007, 262(7-8), pp.800-806.

DOI: 10.1016/j.wear.2006.08.028

[14] Farhani, M.; Amadeh, A.; Kashani, H.; Saeed-Akbari, A.: The study of wear resistance of a hot forging die, hardfaced by a cobalt-base superalloy, Materials forum, 2006, 30, pp.212-218.