SAE AMS 2315J-2025 三角洲铁素体含量的测定

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For more information on this standard, visit

https://www.sae.org/standards/content/AMS2315J/

AEROSPACE

MATERIAL SPECIFICATION

AMS2315™

REV. J

Issued 1963-01

Reaffirmed 2006-04

Revised 2025-05

Superseding AMS2315H

(R) Determination of Delta Ferrite Content

RATIONALE

AMS2315J is the result of a Five-Year Review and update of the specification. The revision updates sample selection

(see 3.1.3 and 3.1.3.4), revises heat-treatment requirements (see 3.1.4), modifies procedure for limited delta ferrite control

(see 3.2), modifies grid counts (see 3.2.1.1), removes exceptions to reporting %RA (see 3.2.1.3.6), reduces sampling

(see 4.3.1.2), and addresses retesting (see 4.5.2.5).

1. SCOPE

This specification covers two methods for determining the percentage of delta ferrite in steels and other iron alloys. When

applicable, this specification will be invoked by the material specification.

2. APPLICABLE DOCUMENTS

The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the

extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is

specified. When the referenced document has been cancelled and no superseding document has been specified, the last

published issue of that document shall apply.

2.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA

and Canada) or +1 724-776-4970 (outside USA), www.sae.org.

AS7766 Terms Used in Aerospace Metals Specifications

2.2 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,

Tel: 610-832-9585, www.astm.org.

ASTM E3 Preparation of Metallographic Specimens

ASTM E1245 Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image Analysis

2.3 Definitions

Terms used in AMS are defined in AS7766.

SAE INTERNATIONAL AMS2315™J Page 2 of 8

3. TECHNICAL REQUIREMENTS

3.1 Specimen Preparation

3.1.1 Heat Qualification

Sampling for heat qualification shall be in accordance with 4.3.1. Samples shall be converted into test specimens in

accordance with 3.1.3.

3.1.2 Product Qualification

Product from a heat not qualified shall be qualified based on sampling as in 4.3.1 and shall be sampled in accordance with

4.3.2. Samples shall be converted into test specimens in accordance with 3.1.3.

3.1.3 Specimen Selection

Samples of sufficient size to provide specimens having an area sufficient to select the required number of fields to accurately

examine the sample shall be cut from the product as in 3.1.3.1, 3.1.3.2, or 3.1.3.3, as applicable. Each specimen shall be

marked in such a manner that its orientation with respect to the direction of rolling, drawing, or extruding is easily identifiable.

3.1.3.1 For round, hexagonal, or square product, specimens shall be selected from an area midway between the edge

and the center of the sample.

3.1.3.2 For rectangular product, specimens shall be selected from an area midway between the longitudinal edge and

the center of the sample.

3.1.3.3 For tubing and other hollow shapes, specimens shall be selected from samples that include the full wall thickness

of the product if the full wall thickness is 0.500 inch or under and mid-wall if the full wall thickness is over

0.500 inch.

3.1.3.4 For product geometries other than the above, specimens shall be selected at 1/4 thickness or diameter for solid

product and 1/2 wall thickness for hollow/ring products. Alternate specimen locations may be agreed upon

between the purchaser and producer.

3.1.4 Heat Treatment

Specimens, except as specified in 3.1.4.1, may be austenitized at the normal recommended temperature for the grade of

steel being examined and adequately quenched. Quenched specimens shall be tempered at a sufficiently high temperature

to develop good metallographic contrast, unless good metallographic contract can be achieved without tempering.

3.1.4.1 Solution- and precipitation-hardenable steels may be solution heat treated and may be precipitation heat treated

to develop good metallographic contrast.

3.1.5 Polishing

After heat treatment as in 3.1.4, a face of each specimen, perpendicular to the direction of maximum deformation, shall be

ground and polished using standard metallographic polishing techniques in accordance with ASTM E3 to produce a surface

suitable for microscopic examination.

3.1.6 Etching

The polished surface of each specimen shall be suitably etched to reveal delta ferrite (see 8.3).

SAE INTERNATIONAL AMS2315™J Page 3 of 8

3.2 Procedure for Limited Delta Ferrite Criterion

Inspect the specimen surface at a magnification appropriate to observe the relative amount and distribution of delta ferrite

present. If it is evident that many fields will have a zero value, and no single field shall have a value exceeding the material

specification maximum when that maximum is 2% or over or no more than five fields shall have a value exceeding the

material specification maximum when that maximum is less than 2%, then measure a set number of fields defined in a

laboratory procedure sufficient to ensure the upper control limit of the mean (mean + 95% CI) is less than 50% of the

material specification maximum as in 3.2.1 or 3.2.2. A 10% relative accuracy level is not required in this case. For dispute

over the percentage of delta ferrite, the value determined as in 3.2.2 shall govern.

3.2.1 Point Count Method

3.2.1.1 Field Measurement

Project the image of the microstructure of each specimen onto the ground-glass screen of a reflection-type microscope or

metallograph. Place a transparent point-counting grid template either in front of or behind the ground glass. The template

should consist of systematically spaced grid points, such as 100, either in the form of fine crosses or a grid lattice. The

magnification chosen should be high enough to clearly resolve the delta ferrite grains but not so high that the number of

grid points falling in the ferrite grains exceeds one, on average. For each specimen, count the number of grid points (i.e.,

the intersection point of the crosses or grid blocks) that fall within the ferrite grains as one and those that fall on the phase

boundaries as one-half.

3.2.1.2 Field Selection

Select the fields to be measured randomly (that is, without looking at the image) by moving the stage controls. Do not alter

the position so that grid points fall on or miss ferrite grains. Space the fields selected around the specimen surface in a

systematic pattern. Measure a sufficient number of fields so that the relative accuracy (see 3.2.1.3.5) is 10% or less. The

relative accuracy of the measurement is influenced by the volume fraction of the ferrite, the magnification, the grid point

density, the number of fields measured, and the field-to-field variation of the ferrite phase.

3.2.1.3 Calculation

3.2.1.3.1 Ferrite per Field

Calculate the volume fraction of ferrite using Equation 1 for each field measured.

(Eq. 1)

where:

Vδ,i = volume fraction of ferrite in percent of each field

Pδ,i = number of grid points in the ferrite phase or on the phase boundaries

Pt = number of grid points

δi,

--------- 100×=

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标签： #铁素体 #素体 #测定

摘要：

本文档详细介绍了SAE AMS 2315J-2025标准，即关于三角洲铁素体含量测定的最新规范。该标准由SAE International发布，专门用于指导航空航天及高端制造领域中不锈钢与合金材料中三角洲铁素体含量的精确测量与评估。文档涵盖了测定原理、取样方法、试验步骤及结果判定准则，旨在帮助材料工程师、质检人员及研究机构确保材料在焊接、高温或腐蚀环境下的组织稳定性和力学性能。作为AMS 2315J的2025年更新版本，本规范强化了对热处理工艺及化学成分波动的适应性，适用于常见奥氏体-铁素体双相

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SAE AMS 2315J-2025 三角洲铁素体含量的测定

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