Gas nitriding of AISI H13 steel extrusion dies: Consideration of sharp features in the die profiles

Syed Sohail Akhtar, Abul Fazal M. Arif*, Abba A. Abubakar

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


A uniform nitride layer development at various features of extrusion dies is an important factor in the service life of dies. The present study is performed to investigate the influence of die profile corner angles and their orientation on the growth behaviour of nitride layer. Various corner features (including right-angled, acute-angled and obtuse-angled) are machined in AISI H13 steel plates using wire EDM in local die manufacturing plant using the usual die manufacturing process. Samples were then gas nitride under controlled nitriding potential. Uniformity and depth of nitride layers have been investigated in terms of compound layer and total nitride case depth for these three types of corner features using optical and scanning electron microscopes. Hardness across the nitride layer for each feature is measured and compared. The growth behaviour of nitride layer at each feature location is explained in terms of nitrogen concentration and shape of the corner. This study highlighted the need for some design modifications in the hot extrusion die cavities for improved service life.

Original languageEnglish
Title of host publicationProceedings - MONTREAL'2014 AES-ATEMA
Subtitle of host publication17th AES-ATEMA International Conference on Advances and Trends in Engineering Materials and Their Applications, ATEMA MONTREAL 2014
EditorsYehia M. Haddad
PublisherAdvanced Engineering Solutions
Number of pages9
ISBN (Electronic)9781927838020
StatePublished - 2014

Publication series

NameAES-ATEMA International Conference Series - Advances and Trends in Engineering Materials and their Applications
ISSN (Print)1924-3642

Bibliographical note

Publisher Copyright:
© 2014, Advanced Engineering Solutions (AES.COM) Ottawa, Canada.


  • Extrusion die
  • H13 steel
  • Hardness
  • Microstructure
  • Nitriding

ASJC Scopus subject areas

  • Mechanics of Materials
  • General Materials Science


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