Accession Number : ADA181324

Title :   Micromechanisms of Fracture and Crack Arrest in Two High Strength Steels.

Descriptive Note : Research and development rept. Sep 84-Oct 85,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD SHIP MATERIALS ENGINEERING DEPT

Personal Author(s) : Gudas,J P

PDF Url : ADA181324

Report Date : Feb 1987

Pagination or Media Count : 322

Abstract : An investigation of fracture properties of a quenched and tempered martensitic steel and copper precipitation on strengthened low carbon ferritic steel possessing similar yield strengths was conducted. The objective included evaluation of fracture toughness, and explanation of metallurgical mechanisms causing changes in relative fracture performance. A crack arrest toughness test procedure was developed to obtain full plate thickness, lower bound measurements of dynamic fracture toughness at various test temperatures. Micromechanisms of fracture processes were described using metallurgical analysis techniques. Keywords: crack arrest, crack initiation, cleavage fracture, and structural steel.

Descriptors :   *FRACTURE(MECHANICS), *ARRESTING(PROCESS), *CRACK PROPAGATION, *STEEL, CLEAVAGE, COPPER, CRACKING(FRACTURING), DYNAMICS, HIGH STRENGTH ALLOYS, MARTENSITE, MEASUREMENT, METALLURGY, PLATES, PRECIPITATION, QUENCHING, STRUCTURAL STEEL, TEMPERATURE, THICKNESS, TOUGHNESS, YIELD STRENGTH, CARBIDES, LOW TEMPERATURE, MECHANICAL PROPERTIES, PHOTOMICROGRAPHY, HIGH STRENGTH ALLOYS, FERRITES

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE