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Related Experiment Video

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Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
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Cavitation During Superplastic Forming.

John Campbell1

  • 1University of Birmingham, Birmingham, B15 2TT, UK. jc@campbelltech.co.uk.

Materials (Basel, Switzerland)
|August 22, 2017
PubMed
Summary
This summary is machine-generated.

Cavitation during superplastic forming is unlikely due to intrinsic metal properties. Instead, it initiates at oxide bifilms, defects introduced during casting, significantly impacting material behavior.

Keywords:
bifilmcasting defectcavitationsuperplasticity

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Cavitation, the formation of pores, occurs during superplastic forming, often at grain boundaries.
  • Existing theories suggest intrinsic metal properties like dislocation mechanisms are unlikely causes.
  • Cavitation is frequently observed at grain boundary triple points or on second-phase particles.

Purpose of the Study:

  • To review theories on cavitation initiation during superplastic forming.
  • To propose a novel mechanism for cavitation based on extrinsic defects.
  • To identify methods for mitigating cavitation and improving superplastic behavior.

Main Methods:

  • Literature review of cavitation theories.
  • Analysis of proposed extrinsic defect mechanisms (oxide bifilms).
  • Correlation of defect presence with cavitation initiation and material failure.

Main Results:

  • Intrinsic metal processes are unlikely to cause cavitation.
  • Cavitation is proposed to initiate at non-bonded interfaces, specifically oxide bifilms.
  • Oxide bifilms, introduced during casting, act as crack initiation sites within grain boundaries.
  • Second-phase particles likely grow on bifilms, not nucleate independently at boundaries.

Conclusions:

  • Oxide bifilms are the primary cause of cavitation during superplastic forming.
  • Improved melting and casting techniques can reduce bifilm populations.
  • Minimizing bifilms promises significant enhancements in superplastic material performance.