| Issue |
MATEC Web of Conferences
Volume 7, 2013
JA 2013 – Journées Annuelles de la SF2M 2013 / SF2M Annual Meeting 2013
|
|
|---|---|---|
| Article Number | 01014 | |
| Number of page(s) | 3 | |
| Section | Colloque 1 : Matériaux pour le Transport / Materials for Transportation | |
| DOI | https://doi.org/10.1051/matecconf/20130701014 | |
| Published online | 07 November 2013 | |
Fragilisation par le zinc liquide des aciers haute résistance pour l'automobile
Liquid zinc embrittlement of high strength automotive steels
1 Institut des Matériaux Jean Rouxel UMR6502, Site de la Chantrerie, BP. 50609, 44306 Nantes, France
2 ArcelorMittal R&D, Automotive Products, Voie Romaine, BP. 30320, 57283 Maizières-lès-Metz, France
3 INSA-Lyon, MATEIS UMR5510, 69621 Villeurbanne, France
Cette étude présente les investigations menées sur la fragilisation par le zinc liquide d'un acier électro-zingué. La caractérisation mécanique par essais de traction à haute température montre un important puits de ductilité entre environ 700 ∘C et environ 950 ∘C. L'observation au MEB des éprouvettes de traction indique que, dans la gamme de température observée pour laquelle il y a fragilisation, on a mouillage intergranulaire des joints de grains de l'acier à l'interface acier/revêtement par des films de Zn. La corrélation entre mouillage intergranulaire thermiquement activé d'une part, et propagation de fissure lors du chargement d'autre part, est discutée.
Abstract
This study deals with liquid zinc embrittlement for electro-galvanized steel. Mechanical characterization by high temperature tensile tests shows a drastic loss of ductility between 700 ∘C and 950 ∘C. SEM investigations show that steel grain boundaries under the steel/coating interface are penetrated by a liquid Zn channel, only in the temperature range of embrittlement. A correlation can be drawn between i) thermal activated-grain boundary wetting and ii) crack propagation in presence of external stress.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.