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Characterization of the effect of cryogenic treatment on the tempering behavior of a secondary hardening high Co-Ni steel
- Source :
- IOP Conference Series: Materials Science and Engineering. 119:012018
- Publication Year :
- 2016
- Publisher :
- IOP Publishing, 2016.
-
Abstract
- For high Co-Ni steels sub-zero treatments are conducted to reduce the retained austenite phase fraction for obtaining excellent fracture toughness properties, but in general, cryogenic treatment has a great impact on the microstructural evolution of steels during tempering. Hence, the aim of this work was to analyze the influence of cryogenic treatments on the microstructural evolution of high Co-Ni steels, including carbide precipitation kinetics and austenite phase fraction evolution, during heating to elevated temperatures. In order to study the formation properties of carbides, the heating processes of cryogenically and non- cryogenically treated specimens were analyzed by dilatometer measurements. Furthermore, for determining the evolution of austenite phase fraction and hardness due to tempering, dilatometer investigations were combined with X-ray diffraction analyses and hardness measurements. It is revealed that sub-zero treated samples exhibit much stronger carbide precipitation signals. This was ascribed to the lower phase fraction of retained austenite, as more carbon is available for carbide precipitation.
- Subjects :
- Austenite
0209 industrial biotechnology
Microstructural evolution
Materials science
Metallurgy
02 engineering and technology
021001 nanoscience & nanotechnology
Carbide
020901 industrial engineering & automation
Fracture toughness
Hardening (metallurgy)
Cryogenic treatment
Tempering
Dilatometer
0210 nano-technology
Subjects
Details
- ISSN :
- 1757899X and 17578981
- Volume :
- 119
- Database :
- OpenAIRE
- Journal :
- IOP Conference Series: Materials Science and Engineering
- Accession number :
- edsair.doi...........46a12aac83b656babd00e78fc2456b89
- Full Text :
- https://doi.org/10.1088/1757-899x/119/1/012018