Influence of high-power diode laser heat treatment on wear resistance of a mold steel

Changkyoo Park, Jinwoo Kim, Ahjin Sim, In duck Park, Ho Jang, Eun Joon Chun

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The effect of hardness on wear loss and wear behavior during fretting was studied. A high-power diode laser was used to achieve the surface hardening of a mold steel (AISI P20-improved) at temperatures of 1000 and 1200 °C. A hardness increment was detected in laser heat-treated specimens, which may be attributed to phase transformation from ferrite to martensite, influencing wear loss and fretting wear behavior. In the fretting test results, smaller wear scars and less wear loss were observed for laser heat-treated specimens in comparison to those of base metal. Moreover, relatively more stable friction coefficient profiles were obtained for the laser heat-treated specimens due to uniform contact characteristics at two contacting surfaces. The effectiveness of the proposed technique was verified by the morphology of the wear scars of the treated specimens, which had a smooth appearance and minor abrasion grooves.

Original languageEnglish
Pages (from-to)829-836
Number of pages8
JournalJournal of Mechanical Science and Technology
Issue number2
Publication statusPublished - 2019 Feb 1

Bibliographical note

Funding Information:
This research was conducted as part of the project AI2870, funded by the Ministry of SMEs and Startups, Republic of Korea.

Publisher Copyright:
© 2019, KSME & Springer.


  • AISI P20-improved
  • Fretting
  • Laser surface treatment
  • Mold steel
  • Wear

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering


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