GB/T 41076-2021Microbeam analysis—Electron backscatter diffraction—Quantitative determination of austenite in steel (English PDF)
微束分析 电子背散射衍射 钢中奥氏体的定量分析
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 31, 2021
Implementation date
July 1, 2022
Scope
GB/T 41076-2021 is the English-translated version of 微束分析 电子背散射衍射 钢中奥氏体的定量分析.
GB/T 41076-2021 describes how to quantify austenite in steel with electron backscatter diffraction (EBSD) in a scanning electron microscope.
It covers both the amount and the morphology of the austenite, and sets out the method principle, the equipment, sampling and sample preparation, the measurement steps, data processing and the content of the inspection report.
It defines the equivalent circle diameter and the aspect ratio used to describe grain shape. The method applies to medium and low carbon steels and alloy steels whose austenite grains are larger than 50 nm; finer austenite is excluded because it would seriously affect the accuracy of the result.
An informative annex works through an example on TRIP590 steel. It was issued on 31 December 2021 and has applied since 1 July 2022.
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Document preview — GB/T 41076-2021
National Standard of the People's Republic of China
- ICS
- 71.040.40
- Classification
- G 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Method overview
- 5 Device
- 6 Sampling and sample preparation
- 7 Measurement step
- 8 Data processing
- 9 Inspection report
- Appendix A (Informative) Example of EBSD Quantitative Analysis of Austenite in TRIP590 Steel
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1 Structure and Drafting Rules of Standardization Documents" drafted.
1 Scope
This document specifies the measurement of austenite in steel by electron backscatterdiffraction (EBSD) method.
Methods, equipment, sampling and sample preparation, measurement procedures, data processing and inspection reports for integration and morphology.
This document is applicable to the analysis of medium and low carbon steels and medium and low carbon alloy steels containing austenite with a grain size above 50 nm.
This document is not applicable to the analysis of austenite with a grain size smaller than 50 nm, which will seriously affect the quantification The accuracy of the analysis results.
NOTE: The lower grain size limit is the smallest observable austenite grain size. The lower grain size limit depends on equipment conditions and operating parameters.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.
GB/T 13298 Metal Microstructure Test Method
GB/T 19501 Microbeam Analysis General Rules for Electron Backscatter Diffraction Analysis Methods
GB/T 23414 Microbeam Analysis Scanning Electron Microscopy Terminology
GB/T 30067 Metallographic Terminology
GB/T 30703 Microbeam Analysis Electron Backscatter Diffraction Orientation Analysis Method Guidelines
GB/T 34172 Microbeam Analysis Electron Backscatter Diffraction Phase Analysis Method for Metals and Alloys
GB/T 38532 Microbeam Analysis Electron Backscatter Diffraction Determination of Average Grain Size
YB/T 4377 Electrolytic Polishing Method of Metal Specimens
3 Terms and Definitions
GB/T 19501, GB/T 23414, GB/T 30067, GB/T 30703, GB/T 34172 and GB/T 38532 as defined and below Listed terms and definitions apply to this document.
3.1 Equivalent circle diameter
The diameter of the circle equivalent to the grain cross-sectional area.
3.2 Aspect ratio
The ratio of the short axis to the long axis of the grain cross-section fitting ellipse.
Note 1. Also known as the elongation of the grain.
Note 2. The value range of the aspect ratio is 0~1.
Note 3. There are various methods for ellipse fitting of grain sections, and the obtained aspect ratios are slightly different. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 13298Inspection Methods of Microstructure for Metals
- GB/T 19501Microbeam analysis - General guide for electron backscatter diffraction analysis
- GB/T 23414Microbeam analysis - Scanning electron microscopy - Vocabulary
- GB/T 30067Standard terminology relating to metallography
- GB/T 30703Microbeam analysis -- Guidelines for orientation measurement using electron backscatter diffraction
- GB/T 34172Microbeam analysis—Electron backscatter diffraction—Phase analysis method of metal and alloy
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Related Standards
GB/T 13298-2015 — Inspection Methods of Microstructure for Metals
GB/T 19501-2013 — Microbeam analysis - General guide for electron backscatter diffraction analysis
GB/T 23414-2026 — Microbeam analysis - Scanning electron microscopy - Vocabulary
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