DESIGN OF EXPERIMENTS TO INVESTIGATE RESIDUAL STRESSES AND FATIGUE LIFE IMPROVEMENT BY A SURFACE TREATMENT |
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| Authors: | A. Freddi D. Veschi M. Bandini G. Giovani |
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| Affiliation: | DIEM-Facoltàdi Ingeneria, Universitàdi Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy;R&D Center of Norblast Company, Bologna, Italy |
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| Abstract: | Abstract— The careful design of experiment (DOE) technique has been utilized to analyze the residual stress state and to investigate the fatigue life improvement of a material (nitriding steel) subjected to thermal and mechanical treatment.
Nitriding treatments have been performed on several specimens which have been subsequently shot- peened, varying the main parameters controlling the process. The design of experiment method has been accomplished in order to evaluate the influence of the main shot-peening parameters on the distribution and values of the residual stresses close to the surface, and also in order to estimate the influence of these parameters on fatigue resistance. |
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| Keywords: | Design of experiment Shot-peening Residual stresses Fatigue resistance Nitriding steel |
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