Accession Number : AD0706909

Title :   THERMODYNAMICS OF PRECIPITATION AND TRANSFORMATION IN SOLID STEELS.

Descriptive Note : Final rept. 1 Mar 67-31 Mar 70,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Chipman,John ; Elliott,John F.

Report Date : 05 MAY 1970

Pagination or Media Count : 12

Abstract : The objective of the project was to secure accurate laboratory data which could serve as a basis for a complete thermodynamic description of the changes occurring in the heat treatment of carbon and alloy steels. The important changes considered are the transformations from liquid to solid, and from austenite to ferrite, and precipitations of graphite, cementite and other carbides from the liquid or solid phases, particularly from austenite. These changes and combinations thereof control the ultimate structure and, hence, the strength and toughness of the steel. The classic approach to the problem utilizes phase diagrams to show the limits of composition and temperature for each phase of the alloy system under equilibrium conditions. A second objective was the development of a method of computation which makes such diagrams unnecessary. (Author)

Descriptors :   (*STEEL, *HEAT TREATMENT), DISPERSION HARDENING, PHASE STUDIES, THERMODYNAMICS, AUSTENITE, CARBON ALLOYS, NICKEL ALLOYS, SILICON ALLOYS

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE