Microstructural Stability and Properties of New Nickel-Base Superalloys with Varying Aluminium: Niobium Ratio

被引：4

作者：

Wise, George J. ^{[1
]}

Miller, James R. ^{[1
]}

Church, Nicole L. ^{[1
]}

Mignanelli, Paul M. ^{[2
]}

Hardy, Mark C. ^{[2
]}

Jones, Nicholas G. ^{[1
]}

Stone, Howard J. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England

[2] Rolls Royce Plc, POB 31, Derby DE24 8BJ, England

来源：

ADVANCED ENGINEERING MATERIALS | 2023年 / 25卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

electron microscopy; microstructure; nickel-base superalloys; Vickers hardness; HEAT-TREATMENT; INCONEL; 718; NI; PRECIPITATION; TEMPERATURE; BEHAVIOR; GROWTH; PHASE; NB;

D O I：

10.1002/adem.202201669

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

New nickel-base superalloys with higher temperature capability are required for future, more efficient gas turbine engines. In designing such alloys, careful consideration is required of the elemental concentrations to ensure a suitable balance of properties is obtained. Herein, the phase equilibria and microstructural stability of new nickel-base superalloys with varying Al:Nb ratio are assessed via long-term thermal exposures at 700 degrees C. The alloys are analyzed using scanning and transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, and Vickers hardness testing, with the results rationalized through mechanical property predictions based on strong- and weak-pair dislocation coupling mechanisms. The alloys are shown to have greater thermal stability than Inconel 718 and exhibit a pronounced hardening effect after thermal exposure. Herein, their ability for controlled age hardening and potential ease of processing is highlighted in the results.

引用

页数：11