Accession Number:

AD0692165

Title:

THE EFFECT OF HEAT TREATMENT ON THE FRACTURE TOUGHNESS AND SUBCRITICAL CRACK GROWTH CHARACTERISTICS OF A 350-GRADE MARAGING STEEL

Descriptive Note:

Research rept.

Corporate Author:

BOEING CO RENTON WA COMMERCIAL AIRPLANE GROUP

Personal Author(s):

Report Date:

1969-06-01

Pagination or Media Count:

18.0

Abstract:

The heat treatment response of a 350-grade maraging steel, with the nominal composition 18.5 Ni, 12 Co, 4.6 Mo, 1.4 Ti, balance Fe, has been determined in billet and bar form. When aged at temperatures below 900F, the material was very susceptible to subcritical crack growth, and premature brittle fracture occurred in unnotched tension specimens loaded at a slow strain rate in laboratory air. Fracture mechanics was used to interpret this behavior.

Subject Categories:

  • Metallurgy and Metallography
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE