Accession Number : AD0736937

Title :   Discontinuous Twinning during Essentially Elastic Compression of Steel at 4.2 K.

Descriptive Note : Technical rept.,

Corporate Author : MARYLAND UNIV COLLEGE PARK ENGINEERING MATERIALS GROUP

Personal Author(s) : Madhava,Murali N. ; Worthington,Peter J. ; Armstrong,Ronald W.

Report Date : DEC 1971

Pagination or Media Count : 12

Abstract : The report gives preliminary results on the compression and tensile testing of SAE 1010 steel at 4.2K. At this temperature, which is far below the ductile-brittle transition temperature, the extended stress-strain behaviour in compression, even to strains on the order of 30%; is totally accounted for by the strain occurring during discontinuous load drops. Otherwise, the specimen exhibits continued elastic loading and unloading. These results are attributed to essentially elastic twinning of the steel whereby the twins and accommodating matrix flow produce a 'locked-in' state of deformation. (Author)

Descriptors :   (*STEEL, CRYOGENICS), (*DEFORMATION, STEEL), TWINNING(CRYSTALLOGRAPHY), FRACTURE(MECHANICS), COMPRESSIVE PROPERTIES, DUCTILE BRITTLE TRANSITION

Subject Categories : Metallurgy and Metallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE