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Improving the Fatigue Crack Resistance of Waspaloy by Shot Peening

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Abstract:

Four-point bending fatigue tests were conducted to study the effect of shot peening on the fatigue life of the nickel-base superalloy, Waspaloy. The influence of shot peening intensity on crack initiation, Stage I crack growth and the Stage I-to-Stage II crack growth transition phases, has been examined to identify the mechanisms by which shot peening improves fatigue resistance. The potential for extending the fatigue life of fatigue-damaged Waspaloy components has been explored by shot peening specimens which had been cyclic damaged to various degrees. The fatigue test was then continued after peening to ascertain the possibility of crack arrest or extending fatigue life. These experiments explore the possibility of ‘healing’ fatigue damage by a surface engineering treatment.

Keywords: Fatigue crack resistance; Shot peening; Waspaloy

Document Type: Research Article

Affiliations: 1: SIRIUS, Department of Mechanical Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK 2: Department of Mechanical Engineering, University of Capetown, P.B. Rondebosch 7700, Capetown, Republic of South Africa 3: Ecole Centrale de Lille, Cité Scientifique BP 48, F 59 651, Villeneuve d’Ascq Cedex France 4: EMBRACO, Empresa Brasileira de Compressores S.A., Joinville, Brazil

Publication date: December 1, 1998

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