Overview
EN ISO 5754:2023 - "Sintered metal materials, excluding hardmetals - Unnotched impact test piece" defines the geometry and basic requirements for unnotched Charpy impact test specimens made from sintered metal materials. Published as a CEN-adopted version of ISO 5754:2023, this standard is aimed at powder metallurgy (PM) applications where impact testing on sintered parts or machined sintered specimens is required. It excludes hardmetals and clarifies when a notched specimen (see ISO 148-1) may be more appropriate.
Key topics and requirements
- Specimen dimensions: The standard specifies the unnotched test piece dimensions in millimetres:
- Length L = 55 ± 1 mm
- Cross-section A = 10 ± 0.2 mm
- Cross-section B = 10 ± 0.2 mm
- Tooling guidance: A corner radius of up to 1 mm on dies and punches is permitted to improve tool life and robustness.
- Specimen origin: Test pieces may be produced directly by pressing and sintering or by machining a sintered part.
- Marking: Specimens must be marked so the pressing direction is identifiable.
- Impact direction: Unless otherwise specified, the direction of the Charpy impact is normal to the pressing direction.
- Test method: Impact testing is performed on a Charpy impact testing machine in accordance with ISO 148-1.
- Scope limitations: The standard applies to all sintered metals and alloys except hardmetals. A NOTE warns that for porous sintered materials, results from unnotched specimens may not be directly comparable with results from notched specimens on solid metals.
Applications and practical use
EN ISO 5754:2023 is used to standardize test-piece geometry and handling for impact testing of sintered components in contexts such as:
- Quality control and acceptance testing for sintered metal parts
- Material development and R&D in powder metallurgy
- Supplier specifications and contractual testing requirements
- Failure analysis where impact toughness of sintered alloys is relevant
- Tooling and die design guidance for producing reproducible specimens
Typical users include PM manufacturers, metallurgists, mechanical testing laboratories, design engineers, and certification bodies that require consistent Charpy impact results for sintered materials.
Related standards
- ISO 148-1 - Charpy pendulum impact test - Part 1: Test method (referenced for test execution and notched specimen guidance)
- EN ISO 5754:2023 supersedes EN ISO 5754:2017 and was prepared by ISO/TC 119 and CEN/SS M11.
By following EN ISO 5754:2023, organizations ensure consistent specimen geometry and test orientation for reliable impact data on sintered metals, improving comparability and traceability in powder metallurgy testing.
