Določevanje dobe trajanja nerjavnih jekel v pogojih napetostno korozijskega pokanja
Lifetime prediction of stainless steels in stress corrosion environments

slovenian

2001

volume 35, issue 6

Inštitut za kovinske materiale in tehnologije
(Obvezni izvod spletne publikacije)

A survey of the literature has shown that there is no clear or accurate definition of stress corrosion cracking processes. Because of this and because of the complexity of these processes, it is very difficult to determine the lifetime of metallic materials when exposed to stress corrosion cracking. Over the last few years a new method for defining corrosion elongation curves has been developed, on the basis of which such lifetimes can be predicted. Using various modifications of this method, it is possible to determine accuratelt the primary, secondary and tertiart regions of corrosion elongation curves. On the basis of experimentally-determined relationships between log i$_ss$, and log sigma, on the one hand, and log t, on the other hand, working diagrams have been constructed from which it is possible to predict the time to crack initiation, the time of the crack's stable growth, and the time to failure of the material. Based on the results of laboratory tests, and the correlation of these results with those obtained in practice, such working diagrams can be used to determine the lifetime of vital parts of machinery and other structures in various branches of industry.

16.09.2009