Abstract
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 language | English |
|---|---|
| Pages (from-to) | 72-77 |
| Number of pages | 6 |
| Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |
| Volume | 84 |
| Issue number | 3 |
| Publication status | Published - 1998 |
| Externally published | Yes |
Keywords
- 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