FACTORS INFLUENCING THE STRENGTH DIFFERENTIAL OF HIGH STRENGTH STEELS

Room temperature tensile and compressive true stress-true strain curves of various high strength steels (quenched and tempered 4340 steel, 410 martensitic stainless steel and H-11 steel; and aged 300-grade 18 Ni maraging steel) were analysed to determine the effect of the various microstructures on what has been termed the strength differential (SD), i.e., the strength level difference between the tensile and compressive flow curves. Care was taken to insure that the compressive deformation was homogeneous. Regardless of the amount of plastic deformation, the quenched and tempered steels exhibited a higher flow stress in homogeneous compressive deformation than in tensile deformation. The extent of the SD was dependent on tempering temperature. This observation is consistent with what others have observed regarding yield strength behavior of quenched and quenched-and-tempered steels. Despite the low carbon content, aged maraging steel also showed a greater resistance to homogeneous compressive deformation. Metallographic examination of the maraging steel revealed the banding that is indicative of segregation. However, homogenization had little effect on the SD despite a change in austenite grain size, reverted austenite content, and the austenite-to-martensite transformational strains shown by Goldberg to be present in segregated material.

  • Corporate Authors:

    Army Materials and Mechanics Research Center

    Materials Testing Division
    Watertown, MA  USA  02172
  • Authors:
    • Chait, R
  • Publication Date: 1971-11

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00028806
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: AMMRC TR 71-48
  • Files: TRIS
  • Created Date: Apr 21 2003 12:00AM