ASTM E1268-01(2016)
Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures

Standard No.

ASTM E1268-01(2016)

Release Date

2001

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E1268-18

Latest

ASTM E1268-19

Scope

5.1 This practice is used to assess the nature and extent of banding or orientation of microstructures of metals and other materials where deformation and processing produce a banded or oriented condition.

5.2 Banded or oriented microstructures can arise in single phase, two phase or multiphase metals and materials. The appearance of the orientation or banding is influenced by processing factors such as the solidification rate, the extent of segregation, the degree of hot or cold working, the nature of the deformation process used, the heat treatments, and so forth.

5.3 Microstructural banding or orientation influence the uniformity of mechanical properties determined in various test directions with respect to the deformation direction.

5.4 The stereological methods can be applied to measure the nature and extent of microstructural banding or orientation for any metal or material. The microindentation hardness test procedure should only be used to determine the difference in hardness in banded heat-treated metals, chiefly steels.

5.5 Isolated segregation may also be present in an otherwise reasonably homogeneous microstructure. Stereological methods are not suitable for measuring individual features, instead use standard measurement procedures to define the feature size. The microindentation hardness method may be used for such structures.

5.6 Results from these test methods may be used to qualify material for shipment in accordance with guidelines agreed upon between purchaser and manufacturer, for comparison of different manufacturing processes or process variations, or to provide data for structure-property-behavior studies.

1.1 This practice describes a procedure to qualitatively describe the nature of banded or oriented microstructures based on the morphological appearance of the microstructure.

1.2 This practice describes stereological procedures for quantitative measurement of the degree of microstructural banding or orientation.

Note 1: Although stereological measurement methods are used to assess the degree of banding or alignment, the measurements are only made on planes parallel to the deformation direction (that is, a longitudinal plane) and the three-dimensional characteristics of the banding or alignment are not evaluated.

1.3 This practice describes a microindentation hardness test procedure for assessing the magnitude of the hardness differences present in banded heat-treated steels. For fully martensitic carbon and alloy steels (0.10–0.658201;%C), in the as-quenched condition, the carbon content of the matrix and segregate may be estimated from the microindentation hardness values.

1.4 This standard does not cover chemical analytical methods for evaluating banded structures.

ASTM E1268-01(2016) Referenced Document

• ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• ASTM A572/A572M Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel
• ASTM A588/A588M Standard Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance
• ASTM E140 Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, and Scleroscope Hardness
• ASTM E3 Standard Practice for Preparation of Metallographic Specimens
• ASTM E384 Standard Test Method for Microindentation Hardness of Materials
• ASTM E407 Standard Practice for Microetching Metals and Alloys
• ASTM E562 Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count
• ASTM E7 Standard Terminology Relating to Metallography
• ASTM E883 Standard Guide for Reflected-Light Photomicrography

ASTM E1268-01(2016) history

• 2019 ASTM E1268-19 Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures
• 2018 ASTM E1268-18 Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures
• 2001 ASTM E1268-01(2016) Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures
• 2001 ASTM E1268-01(2007) Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures
• 2001 ASTM E1268-01 Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures
• 1999 ASTM E1268-99 Standard Practice for Assessing the Degree of Banding or Orientation of Microstructures