EN ISO 7539-6:2011

Corrosion of metals and alloys - Stress corrosion testing - Part 6: Preparation and use of precracked specimens for tests under constant load or constant displacement (ISO 7539-6:2011)

ISO 7539-6:2011 covers procedures for designing, preparing and using precracked specimens for investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use of precracked specimens for investigating susceptibility to stress corrosion.
The term "metal" as used in ISO 7539-6:2011 includes alloys.
Because of the need to confine plasticity at the crack tip, precracked 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.
Precracked specimens can be loaded with equipment for application of a constant load or can incorporate a device to produce a constant displacement at the loading points. Tests conducted under increasing displacement or increasing load are dealt with in ISO 7539-9.
A particular advantage of precracked 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. The latter data can be taken into account when monitoring parts containing defects during service.

Korrosion der Metalle und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 6: Vorbereitung und Anwendung von angerissenen Proben für die Prüfung unter konstanter Kraft oder konstanter Verformung (ISO 7539-6:2011)

Dieser Teil von ISO 7539 behandelt Verfahren für die Gestaltung, Vorbereitung und Anwendung von
angerissenen Proben zur Untersuchung der Beständigkeit von Metallen gegen Spannungsrisskorrosion.
Empfehlungen für gekerbte Proben werden im Anhang A angegeben.
In diesem Teil von ISO 7539 werden mit der Benennung „Metall“ auch Legierungen erfasst.
1.2 Für die Bewertung dünner Erzeugnisse, z. B. Feinblech oder Draht, sind angerissene Proben wegen
der Notwendigkeit, die Plastizität auf die Rissspitze zu beschränken, nicht geeignet; sie werden im
Allgemeinen für die Bewertung dickerer Erzeugnisse angewendet, zu denen Grobbleche, Stangen und
Schmiedestücke gehören. Sie können auch auf miteinander verschweißte Teile angewendet werden.
1.3 Zur Beanspruchung der angerissenen Proben können Prüfeinrichtungen angewendet werden, die eine
konstante Kraft aufbringen oder die eine Vorrichtung aufnehmen können, mit der eine konstante Verformung
an den Kraftangriffspunkten erzeugt wird. Prüfungen mit ansteigender Auslenkung oder ansteigender Last
sind nach ISO 7539-9 durchzuführen.
1.4 Ein spezieller Vorteil der angerissenen Proben besteht darin, dass mit ihrer Hilfe Daten erhalten werden
können, mit denen kritische Fehlergrößen, bei deren Überschreiten Spannungsrisskorrosionsanfälligkeit
auftreten kann, für Teile mit bekannter Geometrie, die bekannten Spannungen ausgesetzt sind, ermittelt
werden können. Mit Hilfe von angerissenen Proben ist es ferner möglich, die Ausbreitungsgeschwindigkeit
von Spannungskorrosionsrissen zu bestimmen. Diese Daten können für die Überwachung von Teilen
herangezogen werden, in denen beim Einsatz Fehler auftreten.

Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 6: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge constante ou sous déplacement constant (ISO 7539-6:2011)

L'ISO 7539-6:2011 couvre les procédures de conception, de préparation et d'utilisation d'éprouvettes préfissurées servant à évaluer la sensibilité d'un métal à la corrosion sous contrainte. Elle donne des recommandations pour la conception, la préparation et l'utilisation d'éprouvettes préfissurées pour évaluer la sensibilité à la corrosion sous contrainte.
Pour les besoins de l'ISO 7539-6:2011, le terme «métal» inclut également les alliages.
Comme il est nécessaire de confiner la déformation plastique 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.
Les éprouvettes préfissurées peuvent être soumises à une contrainte à l'aide d'appareils exerçant une charge constante ou comprenant un dispositif qui engendre un déplacement constant des points d'application de la charge. Les essais sous déplacement croissant ou sous charge croissante sont traités dans l'ISO 7539‑9.
Les éprouvettes préfissurées présentent l'avantage de permettre l'acquisition de données dont on peut 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. Ces dernières données peuvent être prises en compte dans le cadre de la surveillance, en service, de pièces comportant des défauts.

Korozija kovin in zlitin - Preskušanje napetostne korozije - 6. del: Priprava in uporaba preskušancev z umetno razpoko za preskuse pri konstantni obremenitvi ali konstantni deformaciji (ISO 7539-6:2011)

1.1 Ta del ISO 7539 zajema postopke za načrtovanje, pripravo in uporabo preskušancev z umetno razpoko za preiskavo dovzetnosti za napetostno korozijo. Navaja priporočila za načrtovanje, pripravo in uporabo preskušancev z umetno razpoko za preiskavo dovzetnosti za napetostno korozijo. Priporočila v zvezi s preskušanci z zarezo so navedena v dodatku A.
Izraz »kovina«, kot se uporablja v tem delu ISO 7539, vključuje tudi zlitine.
1.2 Zaradi potrebe po omejitvi plastičnosti na odprtju razpoke preskušanci z umetno razpoko niso primerni za vrednotenje tankih proizvodov, kot so listi ali žice, in se v splošnem uporabljajo za debelejše proizvode, vključno s ploščami, palicami in odkovki. Uporabljajo se lahko tudi za dele, združene z varjenjem.
1.3 Preskušanci z umetno razpoko se lahko obremenijo z opremo za vnos konstantne obremenitve, lahko pa vključujejo pripomoček, ki izvaja konstantno deformacijo na točkah obremenitve. Preskuse, opravljene z naraščajočo deformacijo ali naraščajočo obremenitvijo, obravnava ISO 7539-9.
1.4 Konkretna prednost preskušancev z umetno razpoko je, da omogočajo pridobivanje podatkov, iz katerih se lahko ocenijo kritične velikosti okvare, nad katerimi lahko pride do pokanja zaradi napetostne korozije, komponent znane geometrije, na katere deluje znana napetost. Omogočajo tudi določevanje stopnje širjenja razpoke zaradi napetostne korozije. Zadnji podatki se lahko upoštevajo pri spremljanju delov, ki vsebujejo okvaro, med delovanjem.

General Information

• Status: Withdrawn
• Publication Date: 14-Oct-2011
• Withdrawal Date: 25-Sep-2018
• 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: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 26-Sep-2018
• Ref Project: SIST EN ISO 7539-6:2011 - Corrosion of metals and alloys - Stress corrosion testing - Part 6: Preparation and use of precracked specimens for tests under constant load or constant displacement (ISO 7539-6:2011)

Relations

• Replaces: EN ISO 7539-6:2003 - Corrosion of metals and alloys - Stress corrosion testing - Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement (ISO 7539-6:2003)
• Effective Date: 24-Oct-2011
• Replaced By: EN ISO 7539-6:2018 - Corrosion of metals and alloys - Stress corrosion testing - Part 6: Preparation and use of precracked specimens for tests under constant load or constant displacement (ISO 7539-6:2018, Corrected version 2018-11)
• Effective Date: 03-Oct-2018

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2011
1DGRPHãþD
SIST EN ISO 7539-6:2003
Korozija kovin in zlitin - Preskušanje napetostne korozije - 6. del: Priprava in
uporaba preskušancev z umetno razpoko za preskuse pri konstantni obremenitvi
ali konstantni deformaciji (ISO 7539-6:2011)
Corrosion of metals and alloys - Stress corrosion testing - Part 6: Preparation and use of
precracked specimens for tests under constant load or constant displacement (ISO 7539
-6:2011)
Korrosion der Metalle und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 6:
Vorbereitung und Anwendung von angerissenen Proben für die Prüfung unter konstanter
Kraft oder konstanter Verformung (ISO 7539-6:2011)
Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 6:
Préparation et utilisation des éprouvettes préfissurées pour essais sous charge
constante ou sous déplacement constant (ISO 7539-6:2011)
Ta slovenski standard je istoveten z: EN ISO 7539-6:2011
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 7539-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2011
ICS 77.060 Supersedes EN ISO 7539-6:2003
English Version
Corrosion of metals and alloys - Stress corrosion testing - Part
6: Preparation and use of precracked specimens for tests under
constant load or constant displacement (ISO 7539-6:2011)
Corrosion des métaux et alliages - Essais de corrosion Korrosion der Metalle und Legierungen - Prüfung der
sous contrainte - Partie 6: Préparation et utilisation des Spannungsrisskorrosion - Teil 6: Vorbereitung und
éprouvettes préfissurées pour essais sous charge Anwendung von angerissenen Proben für die Prüfung unter
constante ou sous déplacement constant (ISO 7539- konstanter Kraft oder konstanter Verformung (ISO 7539-
6:2011) 6:2011)
This European Standard was approved by CEN on 14 October 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7539-6:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 7539-6:2011) 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” 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 April 2012, and conflicting national standards shall be withdrawn at the
latest by April 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 7539-6:2003.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 7539-6:2011 has been approved by CEN as a EN ISO 7539-6:2011 without any modification.

INTERNATIONAL ISO
STANDARD 7539-6
Third edition
2011-10-15
Corrosion of metals and alloys — Stress
corrosion testing —
Part 6:
Preparation and use of precracked
specimens for tests under constant load
or constant displacement
Corrosion des métaux et alliages — Essais de corrosion sous
contrainte —
Partie 6: Préparation et utilisation des éprouvettes préfissurées pour
essais sous charge constante ou sous déplacement constant

Reference number
ISO 7539-6:2011(E)
©
ISO 2011
ISO 7539-6:2011(E)
©  ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
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Published in Switzerland
ii © ISO 2011 – All rights reserved

ISO 7539-6:2011(E)
Contents Page
Foreword . iv
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Principle . 4
5  Specimens . 5
5.1  General . 5
5.2  Specimen design . 6
5.3  Stress intensity factor considerations . 17
5.4  Specimen preparation . 22
5.5  Specimen identification . 23
6  Initiation and propagation of fatigue cracks . 23
7  Procedure . 25
7.1  General . 25
7.2  Environmental considerations . 25
7.3  Environmental chamber. 26
7.4  Environmental control and monitoring . 27
7.5  Determination of K by crack arrest . 28

ISCC
7.6  Determination of K by crack initiation . 31
ISCC
7.7 Measurement of crack velocity . 32
8  Test report . 33
Annex A (normative) Use of notched specimens for stress corrosion tests . 35
Annex B (normative) Determination of crack growth velocity . 38

ISO 7539-6:2011(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 7539-6 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys, in
collaboration with the National Physical Laboratory (United Kingdom).
This third edition cancels and replaces the second edition (ISO 7539-6:2003), of which it constitutes a minor
revision.
ISO 7539 consists of the following parts, under the general title Corrosion of metals and alloys — Stress
corrosion testing:
 Part 1: General guidance on testing procedures
 Part 2: Preparation and use of bent-beam specimens
 Part 3: Preparation and use of U-bend specimens
 Part 4: Preparation and use of uniaxially loaded tension specimens
 Part 5: Preparation and use of C-ring specimens
 Part 6: Preparation and use of precracked specimens for tests under constant load or constant
displacement
 Part 7: Method fo slow strain rate testing
 Part 8: Preparation and use of specimens to evaluate weldments
 Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement
The following parts are under preparation:
 Part 10: Testing of alloys using reverse U-bend test method
 Part 11: Guidelines for testing the resistance of metals and alloys to hydrogen embrittlement and
hydrogen assisted cracking
iv © ISO 2011 – All rights reserved

INTERNATIONAL STANDARD ISO 7539-6:2011(E)

Corrosion of metals and alloys — Stress corrosion testing —
Part 6:
Preparation and use of precracked specimens for tests under
constant load or constant displacement
1 Scope
1.1 This part of ISO 7539 covers procedures for designing, preparing and using precracked specimens for
investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use
of precracked specimens for investigating susceptibility to stress corrosion. Recommendations concerning
notched specimens are given in Annex A.
The term “metal” as used in this part of ISO 7539 includes alloys.
1.2 Because of the need to confine plasticity at the crack tip, precracked 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 Precracked specimens can be loaded with equipment for application of a constant load or can
incorporate a device to produce a constant displacement at the loading points. Tests conducted under
increasing displacement or increasing load are dealt with in ISO 7539-9.
1.4 A particular advantage of precracked 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. The latter data can be taken into account when monitoring parts containing defects during
service.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
...