Gas nitriding of h13 tool steel used for extrusion dies: Numerical and experimental Investigation

S. S. Akhtar*, A. F.M. Arif, B. S. Yilbas

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

4 Scopus citations


Gas nitriding under controlled nitriding potential represents one of the most important factors in enhancing the service life of dies used in the hot aluminum extrusion industry. Nitriding of complex-shaped extrusion dies, which is a very sensitive process with regard to achieving a nitride layer with uniform quality, may result in nonuniform nitride layers; therefore, required hardness may not be achieved in some regions of the bearing area. The focus of this chapter is to investigate the influence of various factors like surface texture, multiple nitriding, and die geometry on the kinetics of the nitrided layer developed during the gas nitriding process under controlled nitriding potential. Both experimental and numerical results are presented and compared. In experimental parts, the nitride layers are characterized using different techniques, including optical microscopy, scanning electron microscopy, X-ray diffraction analysis, microhardness analysis, and energy dispersive spectrometry techniques. A sequentially coupled heat-diffusion analysis of nitriding treatment is also conducted numerically using a finite element code, ABAQUS. The numerically predicted results are in close agreement with experimental results in terms of nitride layer growth and nitrogen concentration distribution in the diffusion zone.

Original languageEnglish
Title of host publicationSurface Coating Processes
PublisherElsevier Inc.
Number of pages20
ISBN (Electronic)9780128032503
ISBN (Print)9780128032497
StatePublished - 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Inc. All rights reserved.


  • AISI H13 steel
  • Extrusion
  • Gas nitriding
  • Microstructure
  • Multiple nitriding
  • Profile geometry
  • SEM
  • Simulation
  • Surface preparation

ASJC Scopus subject areas

  • General Engineering
  • General Materials Science


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