Accession Number : ADA194662

Title :   Characterization of High Damping Fe-Cr-Mo and Fe-Cr-Al Alloys for Naval Ships Application.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Ferguson, David B

PDF Url : ADA194662

Report Date : Mar 1988

Pagination or Media Count : 100

Abstract : The metallurgical basis for high damping in Fe-Cr-based alloys was investigated. Two alloys similar to VACROSIL-010 were studied, with compositions of 84.7 Fe-11.44 Cr-2.91 A1 and 84.8 Fe-11.65 Cr-2.92 Mo. The strain dependence of specific damping capacity (SDC) was evaluated using a modified version of the resonant dwell technique. Heat treatment variations were introduced by annealing in argon gas at temperatures between 950 C and 1100 C and then furnace cooling. Cantilever beam specimens were evaluated for SDC at their first three resonant modes (0-1,000 Hz) at room temperature. Changes in damping capacity were correlated with the results of tensile hysteresis testing and dilatometry. Keywords: Damping; Ship silencing; Ferritic stainless steels.

Descriptors :   *FERRITES, *NOISE REDUCTION, *STAINLESS STEEL, *STEEL, ANNEALING, ARGON, BEAMS(STRUCTURAL), CANTILEVER BEAMS, COOLING, DAMPING, DILATOMETERS, DWELL TIME, HYSTERESIS, MILITARY APPLICATIONS, NAVAL VESSELS, RESONANCE, SHIP NOISE, TENSILE TESTERS, CHROMIUM, MOLYBDENUM, ALUMINUM, SHIP NOISE, FERROMAGNETIC MATERIALS, HEAT TREATMENT, THESES

Subject Categories : Properties of Metals and Alloys
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE