Electrically-assisted manufacturing for reduction in forging forces of bearing steels

Christopher D. Lang, C. R. Hasbrouck, Austin S. Hankey, Paul C. Lynch, Bryan D. Allison, John T. Roth

Research output: Contribution to journalConference articlepeer-review


The aerospace industry regularly uses three high-strength steel alloys in the manufacture of their bearings: M50, M50 NiL, and Pyrowear P675. The high strength of these alloys causes increased force, friction, and temperature rise during forging operations, resulting in residual stresses and creating issues with distortion and springback in subsequent machining operations. Electrically-assisted manufacturing (EAM) has been studied for reduction or elimination of these issues in magnesium, aluminum, and titanium alloys as well as A2 tool steel and 304 stainless steel. This research determined the threshold current densities for EAM of Pyrowear P675, M50, and M50 NiL steels. Threshold current densities were determined for each material at 33, 48, and 37 A/mm2 respectively. Once the test reached this threshold a significant reduction in yield stress occurred and the samples had an increase in hardness near the exterior, the authors assess the probability of a phase change due to resistive heating during this forming operation.

Original languageEnglish (US)
Pages (from-to)349-357
Number of pages9
JournalProcedia Manufacturing
StatePublished - 2020
Event48th SME North American Manufacturing Research Conference, NAMRC 48 - Cincinnati, United States
Duration: Jun 22 2020Jun 26 2020

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Artificial Intelligence

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