ISO 24674:2022
(Main)Method and requirements for plasma nitriding and follow-up PVD hard coatings on cold-work mould steels
Method and requirements for plasma nitriding and follow-up PVD hard coatings on cold-work mould steels
This document specifies a method and requirements for plasma nitriding and follow-up PVD hard coatings intended for use in cold-work moulds. This document provides the necessary information, such as the original structure of nitriding steels, process requirements, surface quality and adhesion of duplex PVD coatings, to create an optimal combination of high performance.
Titre manque
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 24674
First edition
2022-09
Method and requirements for plasma
nitriding and follow-up PVD hard
coatings on cold-work mould steels
Reference number
ISO 24674:2022(E)
© ISO 2022
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ISO 24674:2022(E)
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© ISO 2022
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ISO 24674:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements of cold-work mould steels . 1
5 Process requirements . 2
5.1 Requirements for plasma nitriding . 2
5.1.1 Surface polishing . 2
5.1.2 Surface cleaning . 2
5.1.3 Protection against plasma nitriding . 2
5.1.4 Plasma nitriding process . 2
5.2 Requirements for PVD coatings . 3
5.2.1 Mechanical grinding and polishing. 3
5.2.2 Surface cleaning . 3
5.2.3 PVD coating deposition . 3
5.3 Nitriding compound layer and case depth . 3
5.4 Nitriding diffusion layer . . 3
5.5 Brittleness of nitrided layer . 4
5.6 Adhesion of duplex coating . 5
Bibliography . 6
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ISO 24674:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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on the ISO list of patent declarations received (see www.iso.org/patents).
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings,
Subcommittee SC 9, Physical vapor deposition coatings.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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ISO 24674:2022(E)
Introduction
Cold-work moulds in automotive application are subjected to heavy wear and severe pressures, while
meeting key criteria including high surface hardness and good core strength. Due to higher hardness
and better wear resistance compared with the physical vapour deposition (PVD) coating, the duplex
treatment based on plasma nitriding and follow-up PVD hard coating has been widely used to improve
the lifetime of cold-work moulds in the automotive industry. Plasma nitriding is contributed to improve
the loading capacity of the substrate prior to PVD coating deposition. It prevents the plastic deformation
of the substrate and delamination of thin and brittle coating, and provides proper stress and hardness
gradients between the coating and the substrate, which contributes considerably to the increase in
performance of the PVD coating. However, there is no standard to qualify the process, specification and
quality of the duplex treatment, which hinders the further development of duplex PVD coatings in the
cold-work moulds.
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INTERNATIONAL STANDARD ISO 24674:2022(E)
Method and requirements for plasma nitriding and follow-
up PVD hard coatings on cold-work mould steels
1 Scope
This document specifies a method and requirements for plasma nitriding and follow-up PVD hard
coatings intended for use in cold-work moulds. This document provides the necessary information,
such as the original structure of nitriding steels, process requirements, surface quality and adhesion of
duplex PVD coatings, to create an optimal combination of high performance.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
IS
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