Alternative Methods for Determining Microcleanliness: A Study Based on Hot Work Tool Steels

Wolfgang Schützenhöfer, Christina Decker, Bernhard Plank, Ernst Plesiutschnig

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


This study focuses on the development and comparison of standard a
nd alternative methods to evaluate the cleanliness of hot work tool steels
(for comparison reasons also other tool steels) used for dies on a microscopic level. The steels subjected to this study are hot working tool steels produced by an electric arc furnace and ladle furnace (abbreviation of the
investigated materials: conv). After re-melting by either an electric slag (abbrev. PESR) or a vacuum arc furnace (abbrev. VAR), the forged or rolled specimen were taken as subject to investigate cleanliness with different methods. The
typical investigation method for non-metallic inclusions (NMI) is light optical microscopy (LOM) according to different standards such as ASTM E45, ISO 4967, DIN 50602, EN 10247, JIS G0555. For comparison, the alternative methods Gig a Cycle Fatigue tests with automated SEM-EDS-investigations, electrolytic extraction and X-ray computed tomography (XCT) are applied.
To obtain comparative results from the standard and alternative methods,
cylindrical specimens with a circle diameter of ~2 mm and length ~20 mm
used for XCT experiments were destructively investigated with automated LOM according to the LOM - standards as mentioned above and
additionally statistical analysis on specific amount of NMI. Comparative results for the different production routes show a similar size of NMI
within each method. Each method has its advantages and disadvantages concerning additional information, e.g. time for preparation and measurement and costs.

Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication20th International Forgemasters Meeting - IFM 2017
Number of pages9
Publication statusPublished - 2017
Event20th International Forgemasters Meeting - IFM 2017 - Congress Graz, Graz, Austria
Duration: 11 Sept 201715 Sept 2017


Conference20th International Forgemasters Meeting - IFM 2017

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science


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