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Influence of Surface Finish on Bending Fatigue of Forged Steel Including Heating Method, Hardness, and Shot Cleaning Effects

McKelvey, Sean Ambrose
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302110057

Abstract Details

2011, Master of Science in Mechanical Engineering, University of Toledo, Mechanical Engineering.
The overall objective of this study was to conduct a systematic and comprehensive experimental investigation to evaluate and quantify forged surface finish effect at several hardness levels (19 HRC, 25 HRC, 35 HRC, and 45 HRC) on bending fatigue specimens of a commonly used forged steel (10B40 steel). Specimens were subjected to reverse cantilever bending and rotating bending fatigue. Two surface conditions were evaluated, a smooth-polished surface finish to be used as the reference surface, and a hot-forged surface finish. The heating methods used for forging were gas furnace heating as well as induction heating, to allow comparison of the two heating methods, as decarburization depth differs between the two methods. Since shot blasting is commonly used as a forged surface cleaning process with the additional benefit of inducing compressive residual stress, the hot-forged surface finish was evaluated with and without shot blasting. Some testing was also conducted to investigate the effect of the flash left by the forging process. In addition, the effect of grain flow resulting from the forging process was evaluated by testing smooth specimens machined from the same rolled bar used for forging. Fatigue test results in this investigation confirm that the old data commonly used for the as-forged surface condition are too conservative. New forged surface finish factors and curves as a function of hardness or tensile strength and fatigue life were developed based on experimental data. A fracture mechanics-based approach was also used to predict fatigue life for the as-forged fatigue specimens.
Dr. Ali Fatemi (Committee Chair)
Dr. Phillip White (Committee Member)
Dr. Lesley Berhan (Committee Member)
237 p.
Engineering
Fatigue; Surface Finish Effects; Forged Steel; Bending Fatigue

Recommended Citations

Citations

  • McKelvey, S. A. (2011). Influence of Surface Finish on Bending Fatigue of Forged Steel Including Heating Method, Hardness, and Shot Cleaning Effects [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302110057

    APA Style (7th edition)

  • McKelvey, Sean. Influence of Surface Finish on Bending Fatigue of Forged Steel Including Heating Method, Hardness, and Shot Cleaning Effects. 2011. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302110057.

    MLA Style (8th edition)

  • McKelvey, Sean. "Influence of Surface Finish on Bending Fatigue of Forged Steel Including Heating Method, Hardness, and Shot Cleaning Effects." Master's thesis, University of Toledo, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302110057

    Chicago Manual of Style (17th edition)

toledo1302110057
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© 2011, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.