Effect of melt homogenization temperature on the cast structures of in 738 LC superalloy
- Technische Univ. Berlin (Germany). Inst. fuer Metallforschung-Metallkunde
- Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany). Inst. fuer Werkstoffwissenschaft
The structure of investment cast superalloys can be controlled by optimizing the process variables such as melt treatment, including melt superheating (T[sub s]) and the time of homogenization (t[sub h]), as well as casting parameters including mold preheating temperature (T[sub m]) and pouring temperature of the melt (T[sub p]). The effect of casting parameters has been extensively studied for several superalloys. A variation of the melt superheat, i.e. the temperature above the liquidus of the alloy, produces a significant effect on the cast microstructure. The melt must be superheated sufficiently above the liquidus temperature of the alloy to homogenize the melt by dissolving all the previously present phases in the charge. It is generally known that low superheating temperatures cause significant reductions in the grain size. There is no report on the details of the processing and mechanism of this effect. This paper presents the results of heterogeneous nucleation of the primary crystallites of [gamma]-phase and some modes of carbide precipitation in the nickel-base superalloy Inconel 738 LC cast with low melt superheating temperatures.
- OSTI ID:
- 5188404
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 30:5; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INCONEL 738
CASTING
MICROSTRUCTURE
NICKEL BASE ALLOYS
PHASE STUDIES
TRANSITION TEMPERATURE
ALLOYS
FABRICATION
INCONEL ALLOYS
NICKEL ALLOYS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
360102* - Metals & Alloys- Structure & Phase Studies
360101 - Metals & Alloys- Preparation & Fabrication