Inconel 718高溫合金電渣重熔熱力學分析

段生朝; 郭漢杰; 石驍; 郭靖; 李彬; 韓少偉; 楊文晟

doi:10.13374/j.issn2095-9389.2018.s1.009

Inconel 718高溫合金電渣重熔熱力學分析

doi: 10.13374/j.issn2095-9389.2018.s1.009

段生朝^1,2,
郭漢杰^1,2, ,,
石驍^1,2,
郭靖^1,2,
李彬^1,2,
韓少偉^1,2,
楊文晟^1,2

1. 北京科技大學冶金與生態工程學院;
2. 高端金屬材料特種熔煉與制備北京市重點實驗室

基金項目:

國家自然科學基金資助項目 (51274031)

國家自然科學基金聯合基金資助項目 (U1560203)

詳細信息

通訊作者:
郭漢杰, E-mail:guohanjie@ustb.edu.cn

中圖分類號: TF14;TG132.3
計量
- 文章訪問數: 11
- HTML全文瀏覽量: 3
- PDF下載量: 0
- 被引次數: 0
出版歷程
- 收稿日期: 2018-02-03
- 網絡出版日期: 2023-07-18

Thermodynamic analysis of the smelting of Inconel 718 superalloy during electroslag remelting process

DUAN Sheng-chao^1,2,
GUO Han-jie^{1,2
, ,},
SHI Xiao^1,2,
GUO Jing^1,2,
LI Bin^1,2,
HAN Shao-wei^1,2,
YANG Wen-sheng^1,2

1. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;
2. Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials

摘要

摘要: 基于離子-分子共存理論建立了計算電渣重熔Inconel 718高溫合金過程中平衡Al和Ti含量的熱力學模型.并討論了Ca O-Si O₂-MgO-Fe O-Al₂O₃-Ti O₂-Ca F₂電渣重熔渣系成分變化時, 渣中各組元的活度、活度比值與爐渣成分的關系.與此同時, 研究了不同溫度條件下, 鎳基合金中平衡的Al和Ti含量與爐渣成分之間的關系.結果表明:冶煉溫度升高時, 合金中平衡的Al含量隨之升高, 而平衡Ti含量降低;渣中MgO和Ca F₂只起到調整爐渣物理化學性質的作用, 對控制鎳基合金中Al和Ti元素燒損作用不大.
- 高溫合金 /
- 電渣重熔 /
- 熱力學 /
- 離子-分子共存理論
Abstract: Inconel 718, a precipitation strengthening nickel-based superalloy, is widely used in aerospace and other high-temperature process industries because of its adequate strength, ductility, and good workability.The increasing demand for alloys with remarkable comprehensive performance necessitates the development of alloys with highly uniform microstructures and highly homogeneous composition;therefore, electroslag remelting (ESR) has attracted much attention in metallurgical circles.However, strong chemical reactions, such as (Al₂O₃) +[Ti]= (Ti O₂) +[Al], usually occur at the electrode-slag interface (ESI) or the droplet-slag interface (DSI) and the metal pool-slag interface (MSI) ;therefore, the concentrations of Al and Ti cannot be maintained within specifications, or the elements cannot be uniformly distributed along the height of the ingots during the ESR process.Consequently, mechanical property deteriorates and the production cost of nickel-based alloy increases.To overcome these issues, in this study, a thermodynamic model for calculating equilibrium content of Al and Ti in a nickel-based alloy during ESR was developed based on the ion and molecule coexistence theory (IMCT) .The chemical composition of slags plays a key role in the physicochemical properties of slags and controls the loss of alloying element during ESR process.Therefore, the respective relations between the activity and activity ratio of individual slag components with chemical composition of Ca O-Si O₂-MgO-Fe O-Al₂O₃-Ti O₂-Ca F₂slag were studied.Furthermore, effect of the slag composition on the equilibrium content of Al and Ti in Inconel 718 superalloy under various metallurgical temperatures during ESR was investigated.The results indicate that the equilibrium content of Al increases with increasing temperature, however, the equilibrium content of Ti decreases.MgO and Ca F₂have little influence on the control of the loss of active alloy elements.
- superalloy /
- electroslag remelting /
- thermodynamic analysis /
- ion and molecule coexistence theory

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