Fracture threshold and shock induced strengthening of stainless steel

E. Zaretsky, M. Kaluzhny

Research output: Contribution to journalArticlepeer-review

Abstract

Hugoniot Elastic Limit and spall strength of Fe-Cr-Ni stainless steel near its dynamic fracture threshold at temperature from 293 K up to 173 K were determined from free surface velocity measurements of the samples shocked up to velocities 120-350 m/sec. The recovered samples were studied metallographically. The martensite generation in rarefaction wave was found starting at temperature 240 K while the static martensite transformation starting point in this steel is MS=214 K. The martensite generation in tension is responsible for the the stainless steel spall strength increase. A model capable of explaining of this phenomena as well as of the stainless steel behavior near its fracture threshold is suggested.

Keywords

  • Fatigue brittleness fracture and cracks
  • High-pressure and shock wave effects in solids and liquids
  • Martensitic transformations
  • Defects and impurities in crystals
  • microstructure

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