Accession Number : AD0857775

Title :   A Critical Evaluation of the Boron Hardenability Effect in Steel.

Descriptive Note : Technical rept.,

Corporate Author : OHIO STATE UNIV COLUMBUS

Personal Author(s) : Spretnak, Joseph W. ; Speiser, Rudolph

Report Date : JUN 1952

Pagination or Media Count : 86

Abstract : The chemistry of boron and the metallurgy of boron in iron and steel are thoroughly reviewed. On the basis of critical evaluation of the existing information, a working hypothesis for the mechanism of the boron hardenability effect is presented. The principal effect of boron is to retard the formation of pro-eutectoid ferrite which forms from austenite by a shear mechanism. This retardation occurs because of the excessively high strain energy peaks associated with boron atoms dissolved in austenite. Nucleation and growth processes are expected only when the system passes from a disordered state to a more highly ordered state. (Author)

Descriptors :   (*STEEL, BORON), (*BORON, HARDNESS), METALLURGY, CRYSTAL STRUCTURE, FERRITES, STRAIN(MECHANICS), MAGNETIC PROPERTIES, DIFFUSION, CARBON, TRANSFORMATIONS, CASTING, GRAIN BOUNDARIES, DYNAMICS, SHEAR STRESSES, SOLVENT EXTRACTION, CHEMICAL EQUILIBRIUM, OPTICAL PROPERTIES, MICROSTRUCTURE, BAINITE, ADSORPTION, INTERACTIONS, SOLID SOLUTIONS, NITROGEN.

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE