EN ISO 7539-9:2021

Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-9:2021)

1.1  This document specifies procedures for designing, preparing and using pre-cracked specimens for investigating the susceptibility of metal to stress corrosion cracking (SCC) by means of tests conducted under rising load or rising displacement. Tests conducted under constant load or constant displacement are dealt with in ISO 7539-6.
The term “metal” as used in this document includes alloys.
1.2  Because of the need to confine plasticity at the crack tip, pre-cracked specimens are not suitable for the evaluation of thin products such as sheet or wire and are generally used for thicker products including plate, bar, and forgings. They can also be used for parts joined by welding.
1.3  Pre-cracked specimens can be stressed quantitatively with equipment for application of a monotonically increasing load or displacement at the loading points.
1.4  A particular advantage of pre-cracked specimens is that they allow data to be acquired from which critical defect sizes, above which stress corrosion cracking can occur, can be estimated for components of known geometry subjected to known stresses. They also enable rates of stress corrosion crack propagation to be determined.
1.5  A principal advantage of the test is that it takes account of the potential impact of dynamic straining on the threshold for stress corrosion cracking.
1.6  At sufficiently low loading rates, the threshold stress intensity factor for susceptibility to stress corrosion cracking, KISCC, determined by this method can be less than or equal to that obtained by constant load or displacement methods and can be determined more rapidly.

Korrosion von Metallen und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 9: Vorbereitung und Anwendung von angerissenen Proben für die Prüfung mit zunehmender Kraft oder zunehmender Verformung (ISO 7539-9:2021)

1.1 Dieses Dokument legt Verfahren für die Gestaltung, Vorbereitung und Anwendung von angerissenen Proben zur Untersuchung der Beständigkeit von Metallen gegen Spannungsrisskorrosion (SCC, en: stress corrosion cracking) mithilfe von Prüfungen, die mit zunehmender Kraft oder zunehmender Verformung durchgeführt werden, fest. Prüfungen mit konstanter Kraft oder konstanter Verformung werden in ISO 7539 6 behandelt.
In diesem Dokument werden mit der Benennung „Metall“ auch Legierungen erfasst.
1.2 Für die Bewertung dünner Produkte, z. B. Feinbleche oder Drähte, sind angerissene Proben nicht geeignet, weil die Notwendigkeit besteht, die Plastizität an der Rissspitze zu beschränken; sie werden im Allgemeinen zur Bewertung dickerer Produkte angewendet, zu denen Grobbleche, Stangen und Schmiedestücke gehören. Sie können auch zur Bewertung von Schweißverbindungen angewendet werden.
1.3 Zur quantitativen Beanspruchung der angerissenen Proben kann eine Prüfeinrichtung verwendet werden, die an den Kraftangriffspunkten eine monoton zunehmende Kraft oder Verformung aufbringt.
1.4 Ein besonderer Vorteil angerissener Proben ist die Möglichkeit zur Ermittlung von Daten zur Abschätzung kritischer Fehlergrößen, bei deren Überschreitung Spannungsrisse auftreten können, für Komponenten mit bekannter Geometrie, die bekannten Spannungen ausgesetzt werden. Mithilfe von angerissenen Proben ist es ferner möglich, die Ausbreitungsgeschwindigkeit von Spannungskorrosionsrissen zu bestimmen.
1.5 Der wichtigste Vorteil dieser Prüfung ist, dass der potentielle Einfluss einer dynamischen Verformung auf den Wert zur Auslösung von durch Spannungskorrosion erzeugten Rissen berücksichtigt wird.
1.6 Nach diesem Verfahren kann bei einer ausreichend niedrigen Beanspruchungsgeschwindigkeit ein kleinerer oder gleich großer KISCC Wert (kritischer Spannungsintensitätsfaktor für die Beständigkeit gegen Spannungsrisskorrosion) als nach dem Verfahren mit konstanter Kraft oder Verformung ermittelt werden und kann schneller bestimmt werden.

Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 9: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge croissante ou sous déplacement croissant (ISO 7539-9:2021)

1.1     Le présent document spécifie les modes opératoires de conception, de préparation et d’utilisation d’éprouvettes préfissurées servant à évaluer la sensibilité d’un métal à la fissuration par corrosion sous contrainte à l’aide d’essais sous charge croissante ou sous déplacement croissant. Les essais effectués sous charge constante ou sous déplacement constant font l’objet de l’ISO 7539‑6.
Pour les besoins du présent document, le terme « métal » inclut également les alliages.
1.2     Comme il est nécessaire de maintenir la plasticité en fond de fissure, les éprouvettes préfissurées ne se prêtent pas à l’évaluation des produits minces tels que les tôles minces et les fils, et sont généralement utilisées pour des produits plus épais tels que les tôles fortes, les barres et les pièces forgées. Elles peuvent aussi être utilisées pour des pièces assemblées par soudage.
1.3     Les éprouvettes préfissurées peuvent être soumises à une contrainte à l’aide d’appareils exerçant une charge ou un déplacement en croissance constante aux points d’application de charge.
1.4     Les éprouvettes préfissurées présentent l’avantage de permettre l’acquisition de données dont il est possible de déduire les tailles critiques de défaut au‑delà desquelles une fissuration par corrosion sous contrainte peut se produire au niveau de pièces de géométrie connue soumises à des efforts connus. Ces éprouvettes permettent également de déterminer la vitesse de propagation des fissures de corrosion sous contrainte.
1.5     L’essai a pour principal avantage de prendre en compte l’effet potentiel de la déformation dynamique sur la limite de fissuration par corrosion sous contrainte.
1.6     À des taux de charge suffisamment faibles, le facteur d’intensité de contrainte limite pour la fissuration par corrosion sous contrainte KISCC déterminé par cette méthode peut être inférieur ou égal à celui obtenu par des méthodes d’essai sous charge constante ou sous déplacement constant et peut être déterminé plus rapidement.

Korozija kovin in zlitin - Preskušanje napetostne korozije - 9. del: Priprava in uporaba preskušancev z umetno razpoko za preskuse pri naraščajoči obremenitvi ali naraščajoči deformaciji (ISO 7539-9:2021)

General Information

• Status: Published
• Publication Date: 24-Aug-2021
• Withdrawal Date: 27-Feb-2022
• ICS: 77.060 - Corrosion of metals
• Technical Committee: CEN/TC 262 - Metallic and other inorganic coatings
• Drafting Committee: CEN/TC 262 - Metallic and other inorganic coatings
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-Aug-2021
• Completion Date: 25-Aug-2021
• Ref Project: SIST EN ISO 7539-9:2021 - Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-9:2021)

Relations

• Replaces: EN ISO 7539-9:2008 - Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-9:2003)
• Effective Date: 01-Sep-2021

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2021
Nadomešča:
SIST EN ISO 7539-9:2008
Korozija kovin in zlitin - Preskušanje napetostne korozije - 9. del: Priprava in
uporaba preskušancev z umetno razpoko za preskuse pri naraščajoči obremenitvi
ali naraščajoči deformaciji (ISO 7539-9:2021)
Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of
pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-
9:2021)
Korrosion von Metallen und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 9:
Vorbereitung und Anwendung von angerissenen Proben für die Prüfung mit
zunehmender Kraft oder zunehmender Verformung (ISO 7539-9:2021)
Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 9:
Préparation et utilisation des éprouvettes préfissurées pour essais sous charge
croissante ou sous déplacement croissant (ISO 7539-9:2021)
Ta slovenski standard je istoveten z: EN ISO 7539-9:2021
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7539-9
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2021
EUROPÄISCHE NORM
ICS 77.060 Supersedes EN ISO 7539-9:2008
English Version
Corrosion of metals and alloys - Stress corrosion testing -
Part 9: Preparation and use of pre-cracked specimens for
tests under rising load or rising displacement (ISO 7539-
9:2021)
Corrosion des métaux et alliages - Essais de corrosion Korrosion von Metallen und Legierungen - Prüfung der
sous contrainte - Partie 9: Préparation et utilisation des Spannungsrisskorrosion - Teil 9: Vorbereitung und
éprouvettes préfissurées pour essais sous charge Anwendung von angerissenen Proben für die Prüfung
croissante ou sous déplacement croissant (ISO 7539- mit zunehmender Kraft oder zunehmender
9:2021) Verformung (ISO 7539-9:2021)
This European Standard was approved by CEN on 24 July 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7539-9:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7539-9:2021) has been prepared by Technical Committee ISO/TC 156
"Corrosion of metals and alloys" in collaboration with Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys”
the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2022, and conflicting national standards
shall be withdrawn at the latest by February 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 7539-9:2008.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN websites.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 7539-9:2021 has been approved by CEN as EN ISO 7539-9:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 7539-9
Second edition
2021-08
Corrosion of metals and alloys —
Stress corrosion testing —
Part 9:
Preparation and use of pre-cracked
specimens for tests under rising load
or rising displacement
Corrosion des métaux et alliages — Essais de corrosion sous
contrainte —
Partie 9: Préparation et utilisation des éprouvettes préfissurées pour
essais sous charge croissante ou sous déplacement croissant
Reference number
ISO 7539-9:2021(E)
©
ISO 2021
ISO 7539-9:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 7539-9:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Specimens . 3
5.1 General . 3
5.2 Specimen design . 4
5.3 Stress intensity factor considerations . .11
5.4 Specimen preparation .15
5.5 Specimen identification .17
6 Initiation and propagation of fatigue cracks .18
7 Procedure.19
7.1 General .19
7.2 Environmental considerations .20
7.3 Environmental chamber .20
7.4 Environmental control and monitoring .21
7.5 Selection of initial K value prior to dynamic loading .22
7.6 Determination of K .
ISCC 22
7.6.1 General.22
7.6.2 Determination schedule .22
7.6.3 Validation of test results .24
7.7 Determination of crack velocity .25
8 Test report .25
Annex A (informative) Determination of a suitable displacement rate for determining K
ISCC
from constant displacement rate tests .27
Annex B (informative) Determination of crack growth velocity.29
Annex C (informative) Information on indirect methods for measuring crack length (see
also ISO 21153) .30
Bibliography .32
ISO 7539-9:2021(E)
Foreword
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