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Title: The cast structure of a 7075 alloy produced by a water-cooling centrifugal casting method

Abstract

A water-cooling centrifugal casting method was applied to cast the 7075 Al alloy to generate a much finer cast structure than that produced by conventional ingot casting methods. The effects of casting parameters, i.e., rotation speed, pouring temperature, water flow, and grain refiner, on casting structure were systematically studied so that the optimum casting condition and the solidification mechanism could be established. The typical cast structure along the thickness direction of a cast ring could be divided into four equiaxed zones, including the chill zone which is in contact with the mold wall. All zones have their characteristic grain size, morphology, and relative thickness, which are all dependent on the casting condition. The optimum casting condition yielding the finest structure available was found to be 3,000 rpm, 650 C, and sufficient water cooling. A uniform portion occupying 90 pct of the whole thickness and having a grain size of 17 [mu]m could be achieved under such a casting condition. When a grain refiner was added, the whole ring became further concentrated with grains of fine structure. A mechanism concerning the overall effects of rapid solidification, turbulent flow, and centrifugal force has been proposed for the present casting method and mightmore » explain the zone-structure formation and the effects of the casting parameters on microstructural features.« less

Authors:
 [1];
  1. (National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering)
Publication Date:
OSTI Identifier:
7207567
Resource Type:
Journal Article
Journal Name:
Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
Additional Journal Information:
Journal Volume: 25:3; Journal ID: ISSN 0360-2133
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; CASTING; MICROSTRUCTURE; CENTRIFUGATION; KINETICS; PARAMETRIC ANALYSIS; ALLOYS; ALUMINIUM ALLOYS; FABRICATION; SEPARATION PROCESSES; 360101* - Metals & Alloys- Preparation & Fabrication; 360102 - Metals & Alloys- Structure & Phase Studies

Citation Formats

Yeh, J.W., and Jong, S.H. The cast structure of a 7075 alloy produced by a water-cooling centrifugal casting method. United States: N. p., 1994. Web. doi:10.1007/BF02651606.
Yeh, J.W., & Jong, S.H. The cast structure of a 7075 alloy produced by a water-cooling centrifugal casting method. United States. doi:10.1007/BF02651606.
Yeh, J.W., and Jong, S.H. Tue . "The cast structure of a 7075 alloy produced by a water-cooling centrifugal casting method". United States. doi:10.1007/BF02651606.
@article{osti_7207567,
title = {The cast structure of a 7075 alloy produced by a water-cooling centrifugal casting method},
author = {Yeh, J.W. and Jong, S.H.},
abstractNote = {A water-cooling centrifugal casting method was applied to cast the 7075 Al alloy to generate a much finer cast structure than that produced by conventional ingot casting methods. The effects of casting parameters, i.e., rotation speed, pouring temperature, water flow, and grain refiner, on casting structure were systematically studied so that the optimum casting condition and the solidification mechanism could be established. The typical cast structure along the thickness direction of a cast ring could be divided into four equiaxed zones, including the chill zone which is in contact with the mold wall. All zones have their characteristic grain size, morphology, and relative thickness, which are all dependent on the casting condition. The optimum casting condition yielding the finest structure available was found to be 3,000 rpm, 650 C, and sufficient water cooling. A uniform portion occupying 90 pct of the whole thickness and having a grain size of 17 [mu]m could be achieved under such a casting condition. When a grain refiner was added, the whole ring became further concentrated with grains of fine structure. A mechanism concerning the overall effects of rapid solidification, turbulent flow, and centrifugal force has been proposed for the present casting method and might explain the zone-structure formation and the effects of the casting parameters on microstructural features.},
doi = {10.1007/BF02651606},
journal = {Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)},
issn = {0360-2133},
number = ,
volume = 25:3,
place = {United States},
year = {1994},
month = {3}
}