FRACTURE CHARACTERISTICS OF STRUCTURAL METALS

Abstract

Results are obtained from smooth and notch tensile tests conducted on the 18% Ni maraging steels. A significant difference in smooth strength properties existed between two heats of the 250,000 psi grade of maraging steel (7% Co). This difference in strength could be correlated to differences in C and Ti content. Plane strain fracture toughness values determined by resistance measurements for one heat of the 7% Co steel over test temperatures ranging from -100 to 300 F indicated that this parameter varied from approximately 150,000 to 130,000 psi-in. to the 1/2 power. Plane strain fracture toughness determined for two heats of 9% Co maraging steel in sheet form (300,000 psi grade) indicated very little variation as a function of test temperature in the -100 to 300 F range. Heat 1 had a mean value of 116,000 psi-in. to the 1/2 power with a standard deviation of 3150 psi-in. to the 1/2 power while heat 2 had a mean value of 110,000 psi-in. to the 1/2 power with a standard deviation of 7130 psi-in. to the 1/2 power. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 31, 1962
Accession Number
AD0292902

Entities

People

  • E.a. Steigerwald
  • G.l. Hanna

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Data Science
  • Information Science
  • Maraging Steels
  • Measurement
  • Mechanical Properties
  • Physical Properties
  • Resistance
  • Standards
  • Steel
  • Toughness
  • Wear Resistance

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Thermal Physics or Thermal Science.