Accession Number : AD0762541

Title :   Mechanism of Stress Corrosion Cracking.

Descriptive Note : Final rept. Sep 60-Oct 73,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Uhlig,H. H.

Report Date : 20 JUN 1973

Pagination or Media Count : 6

Abstract : The susceptibility of any metal-environment system to stress corrosion cracking (s.c.c.) is sensitive to (1) metallurgical factors, e.g. purity, alloying components, heat treatment, cold work, grain size, stress (2) environmental factors, e.g. prevailing electrochemical potential, extraneous ions, temperature, pH. The mechanism of s.c.c. in general, based on presently available facts, is best described in terms of metal-bond disruption by specifically damaging ions adsorbed on appropriate defect sites of a yielding metal surface (stress-sorption cracking). The mechanism is related to that accounting for liquid metal embrittlement and stress cracking of plastics. The use of measured critical potentials below which s.c.c. does not occur provides a promising approach to the practical problem of avoiding environmental failures of stressed metals. (Author)

Descriptors :   (*STRESS CORROSION, STEEL), EMBRITTLEMENT, FRACTURE(MECHANICS), METALS, ALLOYS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE