DIN EN ISO 7539-6 2012-01 PDF

Full title and description

STB DIN EN ISO 7539-6 2012-01 — Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of precracked specimens for tests under constant load or constant displacement. This document is the German (DIN/EN) adoption of ISO 7539-6 (text equivalent to ISO 7539-6:2011) as issued for national use in January 2012; it specifies specimen geometries, fatigue precracking procedures, test-fixture and loading arrangements, environmental control and measurement methods for assessing susceptibility to stress corrosion cracking (SCC) using precracked specimens.

Abstract

This standard provides detailed procedures for designing, preparing and using precracked specimens to evaluate stress corrosion cracking behaviour of metals and alloys under constant-load or constant-displacement test conditions. It covers specimen geometry and dimensions, fatigue precracking, environmental exposure and control, methods to determine KISCC (threshold stress intensity for SCC) by initiation or crack-arrest techniques, crack-growth measurements and test reporting requirements.

General information

• Status: Superseded / historical national adoption (original DIN/EN adoption 2012); replaced by later edition EN/ISO 7539-6:2018 (ISO 7539-6:2018) and subsequent amendment work.
• Publication date: 01 January 2012 (DIN/EN national adoption of ISO 7539-6:2011).
• Publisher: DIN (Deutsches Institut für Normung) — published as DIN EN ISO 7539-6 (national adoption of the ISO text).
• ICS / categories: 77.060 — Corrosion of metals.
• Edition / version: National adoption of ISO 7539-6:2011 (published as EN ISO 7539-6:2011; adopted by DIN in 2012).
• Number of pages: Approximately 38 pages (typical paginated version of the EN/ISO 7539-6:2011 publication).

Scope

This part of ISO 7539 specifies procedures for the design, preparation and use of precracked specimens to investigate susceptibility of metals and alloys to stress corrosion cracking under constant-load or constant-displacement conditions. It is intended for use with thicker product forms (plate, bar, forgings and weldments) where plane‑strain conditions at the crack tip can be maintained; it is not generally suitable for very thin products (sheet or wire). The document includes guidance on specimen geometries, stress intensity calculations, fatigue precracking, environmental chambers and monitoring, methods for determining KISCC by initiation or crack-arrest and requirements for test reports.

Key topics and requirements

• Specimen design and recommended geometries for producing and controlling precracks (dimensions, stress‑intensity considerations).
• Fatigue precracking procedures (R‑ratio guidance, minimum precrack length, measurement and inspection).
• Loading modes and fixtures for constant-load and constant-displacement tests; procedures for applying and monitoring load/displacement.
• Environmental chamber design, control and monitoring: temperature, solution composition, aeration, electrode potential and flow conditions.
• Methods to determine KISCC by crack initiation and by crack-arrest; procedures for measuring crack-growth velocity as a function of stress intensity.
• Test reporting requirements: specimen details, precrack data, environmental conditions, measured KISCC, crack-growth data and full test record.

Typical use and users

Used by corrosion testing laboratories, materials and metallurgical engineers, research institutions, failure‑investigation specialists, welding and quality assurance teams and certification bodies to quantify susceptibility to stress corrosion cracking, determine KISCC thresholds and obtain crack-growth data for design, material selection and lifetime assessment. Laboratories performing SCC testing commonly apply this part of ISO 7539 when precracked specimen techniques are required.

Related standards

ISO 7539 is a multi‑part series on stress corrosion testing; related parts include ISO 7539‑1 (general guidance), 7539‑2 (bent‑beam specimens), 7539‑3 (U‑bend specimens), 7539‑4 (uniaxially loaded tension specimens), 7539‑5 (C‑ring specimens), 7539‑7 (slow strain rate testing) and other parts covering specimen types and specific methods. Later editions of Part 6 were published (ISO 7539‑6:2018 and amendments). Users should consult the full ISO 7539 series for complementary procedures and part‑specific guidance.

Keywords

stress corrosion cracking; SCC; precracked specimens; fatigue precrack; KISCC; crack arrest; crack initiation; constant load testing; constant displacement testing; environmental chamber; specimen geometry; corrosion testing; ISO 7539.

FAQ

Q: What is this standard?

A: It is the DIN/EN national adoption (January 2012) of ISO 7539‑6 — a standard that specifies how to prepare and use precracked specimens to evaluate susceptibility of metals and alloys to stress corrosion cracking under constant‑load or constant‑displacement test conditions.

Q: What does it cover?

A: It covers specimen geometries and dimensions, methods for producing controlled fatigue precracks, loading fixtures and procedures for constant‑load and constant‑displacement tests, environmental control and monitoring, methods to determine KISCC (threshold stress intensity for SCC) by initiation or crack‑arrest, crack‑growth measurement techniques and required test report content.

Q: Who typically uses it?

A: Corrosion test laboratories, materials and metallurgical engineers, researchers studying SCC mechanisms, failure analysts, welding/quality engineers and conformity assessment bodies use this part when precracked specimen methods are appropriate for SCC evaluation.

Q: Is it current or superseded?

A: The DIN EN ISO 7539‑6 national adoption dated January 2012 corresponds to ISO 7539‑6:2011 and has since been superseded by a later edition (ISO 7539‑6:2018, adopted as EN ISO 7539‑6:2018) and subsequent amendment activity; users should consult the most recent edition/amendments (2018 edition and later amendment notices) for up‑to‑date requirements.

Q: Is it part of a series?

A: Yes — ISO 7539 is a multipart series addressing stress corrosion testing of metals and alloys (Parts 1–11 and others under development) covering a range of specimen types and test methods; Part 6 is specifically about precracked specimens.

Q: What are the key keywords?

A: Key keywords include stress corrosion cracking (SCC), precracked specimen, fatigue precrack, KISCC, crack arrest, crack initiation, constant load, constant displacement, specimen geometry and environmental control.