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Title: Effect of melt homogenization temperature on the cast structures of in 738 LC superalloy

Abstract

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.

Authors:
; ; ;  [1];  [2]
  1. (Technische Univ. Berlin (Germany). Inst. fuer Metallforschung-Metallkunde)
  2. (Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany). Inst. fuer Werkstoffwissenschaft)
Publication Date:
OSTI Identifier:
5188404
Resource Type:
Journal Article
Journal Name:
Scripta Metallurgica et Materialia; (United States)
Additional Journal Information:
Journal Volume: 30:5; Journal ID: ISSN 0956-716X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 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

Citation Formats

Liu, L., Zhen, B.L., Banerji, A., Reif, W., and Sommer, F. Effect of melt homogenization temperature on the cast structures of in 738 LC superalloy. United States: N. p., 1994. Web. doi:10.1016/0956-716X(94)90435-9.
Liu, L., Zhen, B.L., Banerji, A., Reif, W., & Sommer, F. Effect of melt homogenization temperature on the cast structures of in 738 LC superalloy. United States. doi:10.1016/0956-716X(94)90435-9.
Liu, L., Zhen, B.L., Banerji, A., Reif, W., and Sommer, F. Tue . "Effect of melt homogenization temperature on the cast structures of in 738 LC superalloy". United States. doi:10.1016/0956-716X(94)90435-9.
@article{osti_5188404,
title = {Effect of melt homogenization temperature on the cast structures of in 738 LC superalloy},
author = {Liu, L. and Zhen, B.L. and Banerji, A. and Reif, W. and Sommer, F.},
abstractNote = {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.},
doi = {10.1016/0956-716X(94)90435-9},
journal = {Scripta Metallurgica et Materialia; (United States)},
issn = {0956-716X},
number = ,
volume = 30:5,
place = {United States},
year = {1994},
month = {3}
}