Fractography survey on high cycle fatigue failure: Crack origin characterisation and correlations between mechanical tests and microstructure in Fe-C-Cr-Mo-X alloys
tool stells; high cycle fatigue; forging; inclusions; carbides; boundary method; fractographic; crack initiation, soakness; LiMaRC - Liège Materials Research Center
Abstract :
[en] Raw materials were cast from different specific processes in order to produce cleaner steels with a reduced amount of inclusions. Studied materials that are HSS hardened alloys belonging to the Fe-Cr-C-X system were shared out in four groups depending on the tempering temperature and the presence of secondary and primary carbides. Both inclusions and carbides were roughly assessed by means of Image Analysis. Forging was done on all studied materials with different reduction ratios in order to highlight the texture influence oil mechanical properties. High cycle fatigue tests were made using the boundary method to allow a quick evaluation of results. Fractographic analyses carried out on broken samples led to the definition of four failure modes depending on the nature and the location of the point from which the crack was initiated in one hand, and the roughness of striations in the propagating area over and around the initiation point. Internal and surface crack initiation points were found, the latter being more harmful than the first ones. Though oxides appeared to be more detrimental than other inclusions, primary carbides were also found to be both crack initiation candidates and crack propagation enhancers. Various parameters likely to influence high cycle fatigue failures were finally defined, the most significant one dealing with the nature and location of embedded precipitates and the forging reduction ratio. (c) 2006 Elsevier Ltd. All rights reserved.
Tchuindjang, Jérôme Tchoufack ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Lecomte-Beckers, Jacqueline ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Language :
English
Title :
Fractography survey on high cycle fatigue failure: Crack origin characterisation and correlations between mechanical tests and microstructure in Fe-C-Cr-Mo-X alloys
Hwang, K.C., Lee, S., Lee, H.C., Effect of alloying elements on microstructure and fracture properties of cast high speed steels rolls. Part I: microstructural analysis (1998) Mater Sci Eng, A256, pp. 282-295
Tchoufang Tchuindjang, J., Lecomte-Beckers, J., Use of microscopy for identification of complex carbides in high-speed steels (2005) GIT Imaging Microsc, 2, pp. 2-3
Murakami, Y., Yokoyama, N.N., Nagata, J., Mechanism of fatigue failure in ultralong life regime (2002) Fatigue Fract Eng Mater Struct, 25, pp. 735-746
Wang, Q.Y., Bathias, C., Kawagoishi, N., Chen, Q., Effect of inclusion on subsurface crack initiation and gigacycle fatigue strength (2002) Int J Fatigue, 24, pp. 1269-1274
Furuya, Y., Matsuoka, S., Abe, T., Yamaguchi, K., Gigacycle fatigue properties for high-strength low-alloy steel at 100 Hz, 600 Hz and 20 kHz (2002) Scripta Mater, 46, pp. 157-162
Suh, C.-M., Hwang, B.-W., Murakami, R.-I., Characteristics of fatigue crack initiation and fatigue strength of nitrided 1Cr-1Mo-0.25V turbine rotor steels (2002) KSME Int J, 16 (8), pp. 1109-1116
Billaudeau, T., Nadot, Y., Support for an environmental effect on fatigue mechanisms in the long life regime (2004) Int J Fatigue, 26, pp. 839-847
Chapetti, M.D., Tagawa, T., Miyata, T., Ultra-long cycle fatigue of high-strength carbon steels part I: review and analysis of the mechanism of failure (2003) Mater Sci Eng, A356, pp. 227-235
Murakami, Y., Nomoto, T., Ueda, T., Murakami, Y., On the mechanism of fatigue failure in super long life regime (N>
107 cycles). Part I: influence of hydrogen trapped by inclusions (2000) Fatigue Fract Eng Mater Struct, 23, pp. 893-902
Meurling, F., Melander, A., Tidesten, M., Westin, L., Influence of carbide and inclusion contents on the fatigue properties of high speed steels and tools steels (2001) Int J Fatigue, 23, pp. 215-224
Billaudeau, T., Nadot, Y., Bezine, G., Multiaxial fatigue limit for defective materials: mechanisms and experiments (2004) Acta Mater, 52, pp. 3911-3920
Nadot, Y., Denier, V., Fatigue failure of suspension arm: experimental analysis and multiaxial criterion (2004) Eng Fail Anal, 11, pp. 485-499
Farfan, S., Rubio-Gonzalez, C., Cervantes-Hernandez b, T., Mesmacque, G., High cycle fatigue, low cycle fatigue and failure modes of carburized steel (2004) Int J Fatigue, 26, pp. 673-678
Lin, S.-K., Lee, Y.-L., Lu, M.-W., Evaluation of the staircase and the accelerated test methods for fatigue limit distributions (2001) Int J Fatigue, 23, pp. 75-83
Jahn, J., Maennig, W.-W., Safe evaluation of fatigue data in the range of finite endurance (1997) Int J Fatigue, 19 (4), pp. 335-344
Sunder, R., Porter, J., Ashbaugh, N.E., The effect of stress ratio on fatigue crack growth rate in the absence of closure (1997) Int J Fatigue, 19 (1), pp. 211-221
Oh, H.-K., Characterization of dynamic fatigue life by the uniaxial tensile test (1995) J Mater Process Technol, 54, pp. 365-371