Accession Number : ADA132272

Title :   Thermomechanical Processing of M-50 Steel.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Larson,Keith Robert , Jr

PDF Url : ADA132272

Report Date : Jun 1983

Pagination or Media Count : 48

Abstract : Thermomechanical processing of AISI M-50 bearing steel was accomplished by an initial austenitize and quench followed by reheating and warm-rolling to a true strain of 2.0. Warm-rolling was successfully conducted at 650, 700, or 750 deg. C. The effect of austenitizing temperature on grain size and residual carbides was evaluated following austenitizing at temperatures from 1090 to 1250 deg. C. Grain growth was noted with increasing austenitizing temperature, especially for temperatures above 115 deg. C. Evaluation of the effect of warm-rolling on both carbide refinement and composition was performed using scanning electron microscopy. Comparison of as-received M-50 and the warm-rolled product were made. Temper carbides, those precipitated during the warm-rolling process, are refined by the processing. Residual carbides, those not dissolved in the initial austenitizing treatment, were only slightly refined in the rolling process. Stress-strain testing was conducted on both as-received and warm rolled materials and the increased strength observed were correlated with refined carbide and grain structures resulting from the warm-rolling. (Author)

Descriptors :   *Steel, *Roller bearings, *Thermomechanics, *Mechanical properties, Thermal properties, Gas turbines, Carbides, Dispersions, Processing, Hot working, Austenite, High temperature, Grain growth, Heat treatment, Stress strain relations, Hardness, Microstructure, Electron microscopy, X rays, Structural analysis, Tensile strength, Research management, Theses

Subject Categories : Properties of Metals and Alloys
      Machinery and Tools
      Mechanics
      Thermodynamics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE