The microstructure of heat-treated nickel-based superalloy 718Plus

被引：26

作者：

Whitmore, Lawrence ^{[1
]}

Ahmadi, Mohammad Reza ^{[2
]}

Guetaz, Laure ^{[3
]}

Leitner, Harald ^{[1
]}

Povoden-Karadeniz, Erwin ^{[2
]}

Stockinger, Martin ^{[4
]}

Kozeschnik, Ernst ^{[2
]}

机构：

[1] Univ Leoben, Dept Phys Met & Mat Testing, Christian Doppler Lab Early Stages Precipitat, A-8700 Leoben, Austria

[2] Vienna Univ Technol, Christian Doppler Lab Early Stages Precipitat, A-1040 Vienna, Austria

[3] CEA Grenoble, LITEN, F-38054 Grenoble 9, France

[4] Bohler Schmiedetech GmbH Co KG, A-8600 Kapfenberg, Austria

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 610卷

关键词：

718Plus; Superalloy; Gamma prime; Anti-phase boundary; Precipitation strengthening; Strength modelling; MECHANICAL-PROPERTIES; DELTA-PHASE; PRECIPITATION; ALLOYS;

D O I：

10.1016/j.msea.2014.05.022

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The microstructure of thermally aged nickel-based 718Plus superalloy is investigated using transmission electron microscopy (TEM). Solution annealing at 980 degrees C for 30 min is followed by either the standard quenching to room temperature or quenching directly to 788 degrees C, before isothermal aging at 788 degrees C for four hours. Micro-hardness and yield strength are measured to compare the effects of the two variations. The size and phase fraction of gamma' precipitates are measured using dark-field TEM and related to the hardness and yield strength through a theoretical model based on coherency and antiphase boundary effects. A population of very small sub-precipitates is observed and the larger gamma' precipitates are investigated in detail using high resolution scanning TEM to reveal information about the chemical ordering. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：39 / 45

页数：7

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