Effects of Si content on the microstructure of modified-HP austenitic steels
Journal Article
·
· Materials Characterization; (United States)
- COPPE/UFRJ, Rio de Janeiro (Brazil)
- COPPE/UFRJ, Rio de Janiero (Brazil) Metallurgical Consulting Services Ltd., Saskatoon (Canada)
The microstructures of two centrifugally cast modified-HP steels with 1.97 wt% Nb and two different Si contents, 1.84 and 2.62 wt.%, were investigated using light and electron microscopy and x-ray diffraction. As noted in a previous study, the instability of the niobium carbide at elevated temperature is a particular feature of these alloys, exhibiting a partial transformation to a nickel-niobium silicide, G phase. The time-temperature-transformation diagram shows that the time to reach the nose of the transformation curve decreases with increase in silicon content. After aging at 900C for 1000h, the alloy with higher silicon content showed extensive secondary precipitation, and at the same time the niobium carbide particles were almost completely transformed to G phase.
- OSTI ID:
- 6209580
- Journal Information:
- Materials Characterization; (United States), Journal Name: Materials Characterization; (United States) Vol. 30:4; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
AGING
ALLOYS
AUSTENITIC STEELS
CARBIDES
CARBON COMPOUNDS
COHERENT SCATTERING
CONCENTRATION RATIO
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
IRON ALLOYS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
MICROSCOPY
MICROSTRUCTURE
NICKEL COMPOUNDS
NICKEL SILICIDES
NIOBIUM ALLOYS
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
NIOBIUM SILICIDES
OPTICAL MICROSCOPY
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SCATTERING
SEMIMETALS
SILICIDES
SILICON
SILICON ALLOYS
SILICON COMPOUNDS
STABILITY
STEELS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
360102* -- Metals & Alloys-- Structure & Phase Studies
AGING
ALLOYS
AUSTENITIC STEELS
CARBIDES
CARBON COMPOUNDS
COHERENT SCATTERING
CONCENTRATION RATIO
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
IRON ALLOYS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
MICROSCOPY
MICROSTRUCTURE
NICKEL COMPOUNDS
NICKEL SILICIDES
NIOBIUM ALLOYS
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
NIOBIUM SILICIDES
OPTICAL MICROSCOPY
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SCATTERING
SEMIMETALS
SILICIDES
SILICON
SILICON ALLOYS
SILICON COMPOUNDS
STABILITY
STEELS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION