Corrosion fatigue crack propagation in metals

Conference · Fri Jun 01 04:00:00 EDT 1990

OSTI ID:6599019

Gangloff, R P

This review assesses fracture mechanics data and mechanistic models for corrosion fatigue crack propagation in structural alloys exposed to ambient temperature gases and electrolytes. Extensive stress intensity-crack growth rate data exist for ferrous, aluminum and nickel based alloys in a variety of environments. Interactive variables (viz., stress intensity range, mean stress, alloy composition and microstructure, loading frequency, temperature, gas pressure and electrode potential) strongly affect crack growth kinetics and complicate fatigue control. Mechanistic models to predict crack growth rates were formulated by coupling crack tip mechanics with occluded crack chemistry, and from both the hydrogen embrittlement and anodic dissolution/film rupture perspectives. Research is required to better define: (1) environmental effects near threshold and on crack closure; (2) damage tolerant life prediction codes and the validity of similitude; (3) the behavior of microcrack; (4) probes and improved models of crack tip damage; and (5) the cracking performance of advanced alloys and composites.

• Research Organization: Virginia Univ., Charlottesville, VA (USA)
• OSTI ID: 6599019
• Report Number(s): N-90-24405; NASA-CR--4301; NAS--1.26:4301; CONF-8809496--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CORROSION
CRACK PROPAGATION
CRYSTAL STRUCTURE
ELECTROLYTES
ELEMENTS
EMBRITTLEMENT
FATIGUE
FRACTURE MECHANICS
HYDROGEN EMBRITTLEMENT
IRON ALLOYS
MECHANICAL PROPERTIES
MECHANICS
METALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS