High thermal gradient directional solidification and its application in the processing of nickel-based superalloys
✍ Scribed by Lin Liu; Taiwen Huang; Min Qu; Gang Liu; Jun Zhang; Hengzhi Fu
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 910 KB
- Volume
- 210
- Category
- Article
- ISSN
- 0924-0136
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✦ Synopsis
The heat transfer during directional solidification by Bridgman-type directional solidification has been analyzed and a relationship has been established that reflects the effect of alloy properties, process parameters and equipment characteristics on thermal gradients. Based on this relationship, some methods for obtaining high thermal gradients have been developed. By using zone-intensified overheating and liquidmetal cooling, high thermal gradients of up to 800 K/cm were achieved. Application of these methods in the processing of single crystal superalloys indicated that high thermal gradient directional solidification produced more uniform microstructures and optimized mechanical properties.