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.

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General Information

Status
Published
Publication Date
15-Sep-2022
Current Stage
6060 - International Standard published
Due Date
14-Apr-2023
Completion Date
16-Sep-2022
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ISO 24674:2022 - Method and requirements for plasma nitriding and follow-up PVD hard coatings on cold-work mould steels Released:16. 09. 2022
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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
---------------------- Page: 1 ----------------------
ISO 24674:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

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Published in Switzerland
© ISO 2022 – All rights reserved
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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

iii
© ISO 2022 – All rights reserved
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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

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

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

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
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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.
© ISO 2022 – All rights reserved
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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
...

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