High-temperature Properties of Hot-Work Tool Steel (AISI H13) Deposited via Direct Energy Deposition

Jongyoun Son, Gwangyong Shin, Kiyong Lee, Chang hwan Choi, Dosik Shim

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

3 Scopus citations

Abstract

Conventionally, a defected tool steel is repaired by welding; however, that repairing does not guarantee homogeneous quality. Hence, this study focused on developing an alternative repairing technique using direct energy deposition (DED) to minimize thermal effects. To investigate a repair using powder-fed DED, AISI H13 powder was deposited onto heat-treated JIS SKD61. The deposited material was observed through scanning electron microscopy and its hardness and tensile properties were determined at 25, 200, 400, 600, and 800 °C. The deposited material showed different hardness distributions in its cross-section, revealing four representative features. The deposited region and dilution showed a hardness of 620 HV with a dendrite structure. The hardness decreased to 490 HV in the heat-affected zone, revealing a tempered martensite structure; however, it increased to 550 HV in the substrate and revealed a typical martensite structure. At all temperatures, the deposited material showed higher hardness than heat-treated SKD61. Moreover, it showed higher ultimate tensile strength and lower elongation in the deposited region. Therefore, this result indicates that without pre- or post-heat treatment, a part repaired using powder-fed DED can have better mechanical properties than heat-treated SKD61.

Original languageEnglish
Title of host publicationForming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity
EditorsGlenn Daehn, Jian Cao, Brad Kinsey, Erman Tekkaya, Anupam Vivek, Yoshinori Yoshida
Pages1665-1676
Number of pages12
DOIs
StatePublished - 2021
Event13th International Conference on the Technology of Plasticity, ICTP 2021 - Virtual, Online
Duration: 25 Jul 202130 Jul 2021

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

Conference13th International Conference on the Technology of Plasticity, ICTP 2021
CityVirtual, Online
Period25/07/2130/07/21

Keywords

  • AISI H13
  • Direct energy deposition
  • Elevated temperature
  • Repair
  • Tensile properties

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