Accession Number : AD0482841

Title :   STRENGTHENING MECHANISMS IN WIRE PRODUCTS.

Descriptive Note : Technical rept. 1 Jun 64-31 Jan 66,

Corporate Author : CRUCIBLE STEEL CO OF AMERICA PITTSBURGH PA

Personal Author(s) : Chandhok, V. K. ; Kasak, A. ; Wachtmeister, G. C.

Report Date : MAY 1966

Pagination or Media Count : 71

Abstract : Strengthening of a wide variety of alloys was studied in the wire form. Emphasis was on combinations of thermal and mechanical treatments. Plain carbon eutectoid steel was cold drawn in isothermally transformed as well as in quenched-plus-tempered conditions. The maximum obtainable strength increases with decreasing isothermal transformation temperature. Severe drawing results in progressive alignment and thinning of the lamellae. In the quenched-plus-tempered conditions, the carbide particle size had a critical effect on the drawability and maximum obtainable strength. Studies on the carbon steel led to the postulation of a strengthening mechanism. This involves dissolution of carbon, migration of carbon, and interaction of carbon with dilocations. The mechanism also appears to apply to steels in which diffusion of a substitutional alloying element is needed for dislocation pinning. Combinations of drawing and aging treatments led to the attainment of the 550,000 psi level on AFC-77 precipitation-hardenable stainless steel. The heat resistance of the AFC-77 wire was remarkable: at 1100 F, the tensile strength was 307,000 psi and the 10-hour creep-rupture strength was 170,000 psi. Thus AFC-77 wire exhibits excellent potential for elevated-temperature structural use; for example, as the high-strength heat-resistant component of advanced composite materials.

Descriptors :   (*STEEL, MECHANICAL PROPERTIES), (*WIRE, MECHANICAL PROPERTIES), CARBON ALLOYS, EUTECTICS, QUENCHING, DRAWING(FORMING), STAINLESS STEEL, HARDENING, AGING(MATERIALS), TENSILE PROPERTIES, COLD WORKING, DISPERSION HARDENING, INTERMETALLIC COMPOUNDS, NICKEL ALLOYS, COBALT ALLOYS, MANGANESE ALLOYS, AUSTENITE, REINFORCING MATERIALS, ALLOYS.

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE