Investigation on the Influence of Manufacturing Parameters on the Fatigue Strength of Components

Abstract:

With cold forging processes it is possible to produce parts characterized by high strength, high dimensional accuracy and high surface quality. In order to optimize the forming process and to be able to use the advantages of cold forging specifically and combined, it is necessary to find correlations between the manufacturing parameters, the strength and the properties, like hardness distribution and surface quality, of the component. The research work covered in this paper focuses on the influence of the components properties influenced by its manufacturing history on their fatigue strength. The used component is a flange hub, produced by a four-stage cold forging process. To obtain different component properties the production process of the hub was varied for example by changing the heat treatment or by producing the parts by turning process. First of all, the components’ properties, for example hardness distribution, remaining residual stresses, orientation of fibers and surface quality, were determined. Moreover, a special experimental setup for the fatigue tests has been designed. The components’ fatigue behavior was determined using a high frequency pulsator and evaluated in terms of finite life fatigue strength and fatigue endurance limit. These examinations were used to produce Woehler curves for the differently manufactured components with a certain statistical data analysis method.

• Periodical: Key Engineering Materials (Volumes 554-557)
• Pages: 280-286
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.554-557.280
• Online since: June 2013
• Authors: Andrea Reiss, Ulf Engel, Marion Merklein
• Keywords: Cold Forging, Fatigue Strength, Influence of Components Properties on Fatigue Life

References

[1] W. Müller, B. Hager, K. Pöhlandt: Einfluss von Verfahrensparametern beim Fließpressen auf das Ermüdungsverhalten. Materialwissenschaft und Werkstofftechnik 66 (1986) 49-50

DOI: 10.1002/mawe.19940250807

[2] A. Yoshida, K. Miyanishi, Y. Ohue, K. Yamamoto, N. Satoh, K. Fujita: Effect of hardended depth on fatigue strength of carbonitrided gears. JSME International Journal 38 (1995) 3, 135-142

DOI: 10.1299/jsmec1993.38.135

[3] E. Siebel, M. Gaier: Untersuchungen über den Einfluss der Oberflächenbeschaffenheit auf die Dauerschwingfestigkeit metallischer Bauteile. VDI-Z (98) 1956, 1715-1724

[4] J.E. Hoffmann, D. Löhe: Influence of macro residual stresses on the fatigue behavior of smooth and notched specimens made from quenched SAE 1045 steel. HTM – Härterei Technische Mitteilungen 57 (2002) 2, 79-85

DOI: 10.4271/2002-01-1408

[5] B. Knolle: Untersuchungen über die Schwingfestigkeit von Schmiedeteilen aus unlegierten Vergütungsstählen und ihre Beeinflussung durch kostenreduzierende Maßnahmen. Dissertation TU Hannover, (1978)

[6] M. Hueck: An improved method for the evaluation of staircase tests. Zeitschrift fuer Werkstofftechnik 14 (1983) 12, 406-417

[7] D. Dengel, M. Karim Khani: Arc sine square root of P transformation - an effective tool for graphical and numerical evaluation of planned Wöhler experiments. International Journal of Fracture 80 (1996) 4, 339-351

DOI: 10.1007/bf00018511