Ultrasonic Characterization of Consolidated Rapidly Solidified Powders: Application to Type 304 Stainless Steel

  • K. L. Telschow
  • J. E. Flinn


Rapid solidification processing (RSP) of materials is an active field with a potential for producing advanced materials with significantly improved properties compared to materials produced by conventional means. For metal powders, RSP can promote certain beneficial features of the material which depend on the cooling rate of the powder, e.g. chemical homogeneity, very fine structures such as grain size, extension of solid solutions, and the development of metastable phases 1,2. Consolidation of these powders into useful forms requires an in-depth understanding of the response of the microstructure to extrinsic consolidation parameters such as pressure (stress), temperature, and the time of application for these parameters. At the Idaho National Engineering Laboratory (INEL), a program is underway to consolidate and characterize the consolidation products of rapidly solidified Type 304 stainless steel (SS) powders. Powders produced by two different methods, centrifugal atomization (CA) and vacuum gas atomization (VGA), are being studied. Three approaches for consolidating the RSP Type 304 SS powders are being investigated: hot isostatic pressing (HIPping), hot extrusion, and dynamic consolidation with explosives. The first two methods are associated with fairly high temperatures and, therefore, present the possibility of altering the rapidly solidified microstructures.


Ultrasonic Measurement Attenuation Measurement Rapid Solidification Processing Stainless Steel Powder Helium Bubble 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. E. Flinn, “Rapid Solidification Technology for Reduced Consumption of Strategic Materials,” Noyes Publications, Park Ridge, NJ, (1985).Google Scholar
  2. 2.
    M. Cohen, B. H. Kear and R. Mehrabian, Rapid Solidification Processing-An Outlook, in: “Rapid Solidification Processing: Principles and Technologies-II,” R. Mehrabian, B. H. Kear and M. Cohen, eds., Claitor’s Publ. Div., Baton Rouge, LA, (1980), pp. 1–23.Google Scholar
  3. 3.
    J. E. Flinn, et al., “Characterization of Extrusion Consolidated -Centrifugally Atomized Type 304 SS Powder,” EGG-SCM-7221 (to be published.)Google Scholar
  4. 4.
    E. P. Papadakis, Scattering in Polycrystalline Media, in: “Methods of Experimental Physics,” Vol.19, P. D. Edmonds ed., Academic Press, New York, (1981), pp. 237–298.Google Scholar
  5. 5.
    E. P. Papadakis, K. A. Fowler and L. C. Lynnworth, Ultrasonic Attenuation by Spectrum Analysis of Pulses in Buffer Rods: Method and Diffraction Corrections, J. Acoust. Soc. Am. 53:1336–1343 (1973).CrossRefGoogle Scholar
  6. 6.
    K. L. Telschow and J. E. Flinn, Ultrasonic Backscatter and Attenuation in Consolidated RSP Powder, “Review of Progress in Quantitative NDE,” Vol. 5B, D. O. Thompson and D. E. Chimenti eds., Plenum Pub. Co., New York, (1986), pp. 1355–1363.Google Scholar
  7. 7.
    K. L. Telschow and J. E. Flinn, “Ultrasonic Backscatter and Attenuation Measurements for Microstructure Characterization: Application to Consolidated Rapidly Solidified Type 304 Stainless Steel Powder,” EGG-SCM-7198, March 1986.Google Scholar
  8. 8.
    J. E. Flinn, et al., “Explosive Consolidation and Post Annealing Response of Rapidly Solidified Type 304 SS Powders,” EGG-SCM-7219 (to be published).Google Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • K. L. Telschow
    • 1
  • J. E. Flinn
    • 1
  1. 1.Idaho National Engineering LaboratoryEG&G Idaho Inc.Idaho FallsUSA

Personalised recommendations