Development of extra fine grain structure of superalloy 718

Wun-Sinhou, Shih Feng Chang, Chung Chun Tsai, Hwa-Teng Lee, Yu-Leiliu, Wei Cheng Kuo, Shang Chih Wang

Research output: Contribution to journalArticle

Abstract

The thermomechanical process is commonly used for the manufacturing of the fine grain structure for Inconel 718, but it is energy consumptive and hard to control precisely. In this study, cold forming combined with recrystallized treatment were used as an alternative method for achieving a fine grain structure, wherein proper control of δ phase formation is quite essential. With the aid of fine uniformly dispersed δ phase precipitates in the matrix, the rapid growth of recrystallized grains that usually happens at high temperature is substantially retarded. Consequently, a fine recrystallized structure with an average grain size of 2-3μm is obtained, which is much finer than the reported finest grains of 11.2μm obtainable by conventional thermomechanical process.

Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalSEAISI Quarterly (South East Asia Iron and Steel Institute)
Volume39
Issue number4
Publication statusPublished - 2010

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Crystal microstructure
heat resistant alloys
Superalloys
Precipitates
cold working
Inconel (trademark)
precipitates
manufacturing
grain size
fine structure
Temperature
matrices
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Wun-Sinhou, Chang, S. F., Tsai, C. C., Lee, H-T., Yu-Leiliu, Kuo, W. C., & Wang, S. C. (2010). Development of extra fine grain structure of superalloy 718. SEAISI Quarterly (South East Asia Iron and Steel Institute), 39(4), 31-36.
Wun-Sinhou ; Chang, Shih Feng ; Tsai, Chung Chun ; Lee, Hwa-Teng ; Yu-Leiliu ; Kuo, Wei Cheng ; Wang, Shang Chih. / Development of extra fine grain structure of superalloy 718. In: SEAISI Quarterly (South East Asia Iron and Steel Institute). 2010 ; Vol. 39, No. 4. pp. 31-36.
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Wun-Sinhou, Chang, SF, Tsai, CC, Lee, H-T, Yu-Leiliu, Kuo, WC & Wang, SC 2010, 'Development of extra fine grain structure of superalloy 718', SEAISI Quarterly (South East Asia Iron and Steel Institute), vol. 39, no. 4, pp. 31-36.

Development of extra fine grain structure of superalloy 718. / Wun-Sinhou; Chang, Shih Feng; Tsai, Chung Chun; Lee, Hwa-Teng; Yu-Leiliu; Kuo, Wei Cheng; Wang, Shang Chih.

In: SEAISI Quarterly (South East Asia Iron and Steel Institute), Vol. 39, No. 4, 2010, p. 31-36.

Research output: Contribution to journalArticle

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T1 - Development of extra fine grain structure of superalloy 718

AU - Wun-Sinhou,

AU - Chang, Shih Feng

AU - Tsai, Chung Chun

AU - Lee, Hwa-Teng

AU - Yu-Leiliu,

AU - Kuo, Wei Cheng

AU - Wang, Shang Chih

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AB - The thermomechanical process is commonly used for the manufacturing of the fine grain structure for Inconel 718, but it is energy consumptive and hard to control precisely. In this study, cold forming combined with recrystallized treatment were used as an alternative method for achieving a fine grain structure, wherein proper control of δ phase formation is quite essential. With the aid of fine uniformly dispersed δ phase precipitates in the matrix, the rapid growth of recrystallized grains that usually happens at high temperature is substantially retarded. Consequently, a fine recrystallized structure with an average grain size of 2-3μm is obtained, which is much finer than the reported finest grains of 11.2μm obtainable by conventional thermomechanical process.

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