BS 7590:1992
Current
The latest, up-to-date edition.
Method for statistically estimating the volume fraction of phases and constituents by systematic manual point counting with a grid
Hardcopy , PDF
English
15-10-1992
Committees responsible
Foreword
Method
1 Scope
2 Informative references
3 Principle
4 Symbols
5 Apparatus
6 Test samples
7 Procedure
8 Calculation of the volume fraction of alpha-phase
Vv, the 95 % confidence interval CI and the
relative error
9 Improving the volume fraction estimate
10 Test report
Annex
A (informative) Worksheet for the determination of
volume fraction by systematic manual point count
Tables
1 Guidelines for grid size selection (total number of
points on a grid) for visually estimated area
fractions
2 Number of fields (n) for a relative error of 33 %
for a given volume fraction and grid size
3 Number of fields (n) for a relative error of 20 %
for a given volume fraction and grid size
4 Number of fields (n) for a relative error of 10 %
for a given volume fraction and grid size
5 Number of fields (n) for a relative error of 5 %
for a given volume fraction and grid size
6 Multipliers for calculation of 95 % confidence
interval
Figures
1 Examples of circular grid configurations
2 Examples of square grid configurations
List of references
Describes clearly defined constituents or phases in microstructure of a steel on a metallographically prepared section.
| Committee |
ISE/1
|
| DevelopmentNote |
Supersedes 91/37958 DC (04/2005) Reviewed and confirmed by BSI, December 2009. (11/2009)
|
| DocumentType |
Standard
|
| Pages |
16
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
This British Standard describes a method for statistically estimating the volume fraction of clearly defined constituents or phases in the microstructure of a steel on a metallographically prepared section using a systematic manual point counting technique.
| Standards | Relationship |
| ISO 9042:1988 | Similar to |
| ISO 9042:1988 | Steels — Manual point counting method for statistically estimating the volume fraction of a constituent with a point grid |
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