Residual Stresses in Rapidly Formed Die Steels

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Background

Objective is to develop direct fabrication of tooling and die components

  • Spray-forming developed at INEEL is fast but has poor control of shape
  • Laser Engineered Net Shaping (LENS) process developed at SNL is slow but has tight control of shape
  • Combination of methods gives speed and precision
  • Materials characterization undertaken at ORNL

  • Sample consists of a spray-formed substrate with two LENS layers deposited on as-received and polished surfaces

  • The interfaces between the LENS and spray-formed layers are prone to cracking

Polishing the surface of the spray-formed material alters the final residual stress state

  • Strains were mapped at discrete locations along line A-A
  • The stress distributions for the polished interface are different from as-received surface

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Acknowledgments

URL: http://www.html.ornl.gov/rsuc/die.html