GB/T 15970.6-2007 (GB/T15970.6-2007, GBT 15970.6-2007, GBT15970.6-2007)
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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
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GB/T 15970.6-2007
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Corrosion of metals and alloys--Stress corrosion testing--Part 6: Preparation and use of pre-cracked specimens
| Obsolete |
GB/T 15970.6-1998
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| Standard ID | GB/T 15970.6-2007 (GB/T15970.6-2007) | | Description (Translated English) | 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 | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H25 | | Classification of International Standard | 77.060 | | Word Count Estimation | 35,320 | | Date of Issue | 2007-05-14 | | Date of Implementation | 2007-12-01 | | Older Standard (superseded by this standard) | GB/T 15970.6-1998 | | Quoted Standard | GB/T 15970.1; GB/T 20120.2 | | Adopted Standard | ISO 7539-6-2003, IDT | | Drafting Organization | CISRI | | Administrative Organization | National Steel Standardization Technical Committee | | Regulation (derived from) | National Standard Announcement 2007 No.5 (Total No.105) | | Proposing organization | China Iron and Steel Association | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the design of pre- designed stress corrosion cracking susceptibility, preparation and the use of other content. Gives the design for the pre- study stress corrosion cracking susceptibility of the sample, preparation and use recommendations. Recommendation concerning notched See Appendix A. As used in this section the term "metal" also includes alloys. Because at the crack tip elastic restraint required to maintain state, so is not suitable for evaluation of pre- cracked specimens such as fine or thin sheet or wire and other materials. Usually only applicable to the evaluation as thick, rods and forgings thicker or coarser material. Pre- cracked specimens are also suitable for welding pieces. Available pre- cracked specimens loaded constant load device, or the device can produce a constant displacement load, increasing load and increasing displacement of the test are described in force 15, 970. 9 points in GB/T. Highlight the advantages of pre- cracked specimens are: data from the side can be calculated from the known geometry and components to withstand the stress limits of known defect size. If the defect size exceeds a critical value, it will cause stress corrosion cracking. Pre- cracked specimens can also be used to browse the expansion rate of stress corrosion cracking. When monitoring is being used defective parts, we can consider the recent data. |
GB/T 15970.6-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.060
H 25
GB/T 15970.6-2007 / ISO 7539-6.2003
Replacing GB/T 15970.6-1998
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, IDT)
ISSUED ON. MAY 14, 2007
IMPLEMENTED ON. DECEMBER 01, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative reference ... 5
3 Terms and definitions ... 6
4 Principle ... 10
5 Specimens ... 11
6 Initiation and propagation of fatigue cracks ... 31
7 Procedure ... 34
8 Test report ... 44
Annex A (normative) Use of notched specimens for stress corrosion tests ... 46
Annex B (normative) Determination of crack growth velocity ... 50
Foreword
GB/T 15970 consists of the following parts under the general title of “Corrosion
of metals and alloys - Stress corrosion testing”.
Part 1. General guidance on testing procedures (GB/T 15970.1-1995);
Part 2. Preparation and use of bent-beam specimens (GB/T 15970.2-2000);
Part 3. Preparation and use of U-bend specimens (GB/T 15970.3-1995);
Part 4. Preparation and use of uniaxially loaded tension specimens (GB/T
15970.4-2000);
Part 5. Preparation and use of C-ring specimens (GB/T 15970.5-1998);
Part 6. Preparation and use of pre-cracked specimens for tests under constant
load or constant displacement (GB/T 15970.6-2007);
Part 7. Slow strain rate testing (GB/T 15970.7-2017);
Part 8. Preparation and use of specimens to evaluate weldments (GB/T
15970.8-2005);
Part 9. Preparation and use of pre-cracked specimens for tests under rising
load or rising displacement (GB/T 15970.9-2007).
This Part is identical to the International Standard 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”.
This Part has made the following editorial modification.
- DELETE the foreword of the International Standard;
This Part replaces GB/T 15970.6-1998 “Corrosion of metals and alloys - Stress
corrosion testing - Part 6. Preparation and use of pre-cracked specimens”
Compared with GB/T 15970.6-1998, the main changes are as follows.
- DELETE the content related to incremental load or incremental
displacement;
- ADD the influence of residual stress and electrode potential change on the
test results;
- ADD a description of the possible influence of residual stress during
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
1 Scope
1.1 This Part of GB/T 15970 covers procedures for designing, preparing and
using pre-cracked specimens for investigating susceptibility to stress corrosion.
It gives recommendations for the design, preparation and use of pre-cracked
specimens for investigating susceptibility to stress corrosion.
Recommendations concerning notched specimens are given in Annex A. The
term “metal” as used in this Part 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 may 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 GB/T 15970.9.
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 may 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 may be taken into account when
monitoring parts containing defects during service.
2 Normative reference
The following documents contain the provisions which, through reference in this
Part of GB/T 15970, become the provisions of this Part. For dated references,
their subsequent amendments (excluding corrigendum) or revisions do not
apply to this Part. However, the parties who enter into agreement based on this
Part are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Part.
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