Improvement of strength and toughness of SKD11 type cold work tool steel

Kenzo Fukaura, Hisakichi Sunada, Yoshihiko Yokoyama, Katsuyuki Teramoto, Daien Yokoi, Nobuhiro Tsujii

Research output: Contribution to journalArticlepeer-review


The strength and toughness of a newly developed 0.8C-8Cr cold work tool steel whose composition was controlled to suppress the precipitation of massive eutectic M 7C 3 carbides were investigated with reference to microstructure and were compared with conventional SKD11. The toughness was evaluated by the area under the stress-strain curve. The tensile strength of the newly developed steel (designated as Mod.SKD11) is about 400MPa higher and the toughness is 1.8 times larger than that of SKD11 throughout a wide range of tempering temperatures. It is revealed from microstructure examination, the fracture surface observation and the estimation of the tensile stress required to generate cleavage crack within M 7C 3 carbide based on Stroh's theory that superior mechanical properties of Mod.SKD11 are attributed to the refinement and homogeneous distribution of M 7C 3 carbides that retards the crack generation and prevents the crack growth, respectively.

Original languageEnglish
Pages (from-to)72-77
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number3
Publication statusPublished - 1998
Externally publishedYes


  • Cold work tool steel
  • Fracture mechanism
  • M C carbide
  • Secondary hardening
  • Tensile strength
  • Toughness

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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