White Etching Crack Root Cause Investigations

Autor:	Andris Jakovics, Joerg Loos, Daniel Merk, Marcus Wolf, Matthias Goss, Toni Blass, Soeren Barteldes, Walter Holweger
Rok vydání:	2014
Předmět:	Materials science Mechanical Engineering Metallurgy chemistry.chemical_element Surfaces and Interfaces Surfaces Coatings and Films Carbide Acoustic emission chemistry Mechanics of Materials Etching (microfabrication) Distortion Ferrite (iron) Slippage Composite material Carbon Weibull distribution
Zdroj:	Tribology Transactions. 58:59-69
ISSN:	1547-397X 1040-2004
Popis:	White etching crack (WEC) failure is distinct to classical fatigue and driven by the composition of lubricants under special loading conditions; for example, slippage and electricity. The white etching area (WEA) within WEC contains carbon supersaturated ferrite (bcc-iron) and carbides, with a size of a few nanometers. This article presents investigations supporting the hypothesis that WEC processes start within a failure-free period by successive accumulation of a structural distortion. This can be measured by acoustic emission. Failure statistics show a steep ascent in the Weibull diagram (s values beyond 1) leading to the assumption that WEC processes start unsuspicious, as one would see as a failure-free period, but imply a hidden subsurface accumulation of material defects. It is suggested and supported by the evidence presented within this article that WEC is neither related to the presence of nonmetallic inclusions nor related to other impurities in the steel. Instead, the failure is a sequence and...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c6fb54fc4b3e0bfebc1920beafff175d https://doi.org/10.1080/10402004.2014.942938 Zobrazit plný text záznamu