The microstructure of discontinuously precipitated lamellae in an austenitic Fe-42. 4 wt pct Ni-4. 15 wt pct Al-0. 45 wt pct C alloy
- Korea Advanced Inst. of Science and Tech., Taejon (Korea, Republic of)
Phase decomposition of austenitic Fe-42.4 wt pct Ni-4.15 wt pct Al-0.45 wt pct C on aging at 823 K was investigated by means of electron microscopy, selected area diffraction and micro-diffraction, and microprobe chemical analysis. During annealing, [kappa] phase of L[prime]1[sub 2] structure fully coherent with the matrix formed via the nucleation and growth mechanism. The matrix phase and cubic [kappa] carbide were later gradually encroached upon by discontinuously precipitated lamellar phases. The duplex fine lamellae are composed of alternately arranged carbon-depleted L1[sub 2] phase and cementite. Between the two constituents in the lamellae, the Pitsch orientation relationship is fulfilled, and at the same time, the matrix phase of the grain which the discontinuously precipitated lamellar colony has left behind maintains the crystallographic cube-to-cube correspondence with the product L1[sub 2] phase.
- OSTI ID:
- 6354543
- Journal Information:
- Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24:5; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
AGING
ALLOYS
ALUMINIUM ALLOYS
ANNEALING
AUSTENITE
CARBON ADDITIONS
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
LAMELLAE
MICROANALYSIS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NONDESTRUCTIVE ANALYSIS
PHASE TRANSFORMATIONS
PRECIPITATION
SCATTERING
SEPARATION PROCESSES
X-RAY DIFFRACTION