Accession Number : AD0287893

Title :   PROCESS CONTROL - HEAT TREATMENT OF 17-7 PH; EFFECT OF VARYING TIME AND TEMPERATURE ON TH-1050 CONDITION

Corporate Author : GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s) : TOKEN,WM. A.

Report Date : SEP 1958

Pagination or Media Count : 1

Abstract : Graphs of varying time and temperatures of brazing, transformation, refrigeration and precipitation hardening cycles are presented which show how the mechanical properties of 17-7 PH are affected. The graphs are computed from an average of the 5 specimens used for each individual test. Photomicrographs of random selected heat treatments are shown. An ttempt was made to identify by photomicrographs the heat treatment used, but that is physically impossible. Subsequent heating of the transformed steel in the range of 200 to 1200 F develops additional increases in strength with the maximum effect in the vicinity of 950 F. This behavior is believed caused principally by the precipitation of an intermetallic compound. X-ray diffraction measurements indicate the presence of such a compound in the hardened steel, but it has not been seen in the optical microscope. The compound is unidentified, but is presumed to be nickel-aluminum. (Author)

Descriptors :   *STAINLESS STEEL, BRAZING, COOLING, DISPERSION HARDENING, HEAT TREATMENT, MECHANICAL PROPERTIES, MICROSTRUCTURE, SHEETS, TEMPERATURE, THICKNESS, TIDEWATER, TRANSFORMATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE