scholarly journals Topologically inverse microstructure in single-crystal superalloys: microstructural stability and properties at ultrahigh temperature

2021 ◽  
Vol 9 (12) ◽  
pp. 497-506
Author(s):  
Yi Ru ◽  
Bin Hu ◽  
Wenyue Zhao ◽  
Heng Zhang ◽  
Yanling Pei ◽  
...  
Keyword(s):  
Single Crystal ◽  
Microstructural Stability ◽  
Ultrahigh Temperature

Precipitation Behavior during Ageing Treatment of a Single Crystal Nickel-Base Superalloy

2005 ◽  
Vol 475-479 ◽  
pp. 673-676
Author(s):  
D.Y. Yang ◽  
Tao Jin ◽  
Na Ru Zhao ◽  
Zhi Wang ◽  
Xiao Feng Sun ◽  
...  
Keyword(s):  
Single Crystal ◽  
Rupture Life ◽  
Creep Rupture ◽  
Nickel Base Superalloy ◽  
Microstructural Stability ◽  
Precipitation Behavior ◽  
Σ Phase ◽  
Ageing Treatment ◽  
Nickel Base ◽  
Base Superalloy

The precipitation behavior during ageing treatment of a single crystal nickel-base superalloy was investigated by SEM and TEM. The results showed that tetragonal needle-like σ phase and blocky -W phase precipitated during low temperature ageing treatment after this testing alloy was completely solution heat treated. σ and -W phases robbed of solid solution strengthening alloying element W、Mo in the matrix and degraded high temperature creep rupture property severely. The creep curve of the crystal tested at 1010 °C and 248 MPa exhibited that the steady state creep rate ε was as high as 9.46 × 10-3/h. The creep-rupture life was only 25 hours. -W phase was not formed by decrease of W content properly. A relatively low level of Co could inhibit σ phase precipitation and improve microstructural stability.

An Ultrahigh-Temperature, Single-Crystal Texture Camera Diffractometer*

1964 ◽  
Vol 8 ◽  
pp. 86-90
Author(s):  
Robert L. Prickett
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Ion Beam ◽  
Sample Surface ◽  
Refractory Materials ◽  
X Ray ◽  
First Order ◽  
Crystal Texture ◽  
Ultrahigh Temperature ◽  
Electronic Detector

AbstractA single-crystal high-temperature X-ray camera has been built with permissible operating temperatures of 2500°C. The camera is constructed to rest upon a Siemens horizontal diffractometer and may be used with either an external electronic detector or with film. The sample is supported on an externally adjustable goniometer head and is heated from the back by an ion beam. Controlled oscillation allows rotation photographs to be obtained from the sample surface not touched by the ion stream. Temperature is controlled by a thermocouple supporting the sample, the thermocouple being an intrinsic part of the goniometer. As a design limit, zero and first order layer lines with iron Kα. radiation on specimens with lattice parameters of 2.6 Å or larger may be recorded. Copper, cobalt, and molybdenum radiation allow even greater latitude. Types of samples that may be studied include powder (pellet), single crystal, wire, or rod. The camera serves equally well for single-crystal, texture, or powder studies on refractory materials.

Effect of Co on microstructural stability of the third generation Ni-based single crystal superalloys

2016 ◽  
Vol 31 (9) ◽  
pp. 1328-1337 ◽  
Author(s):  
Bo Wang ◽  
Jun Zhang ◽  
Taiwen Huang ◽  
Wenchao Yang ◽  
Haijun Su ◽  
...  
Keyword(s):  
Single Crystal ◽  
Third Generation ◽  
Microstructural Stability ◽  
The Third ◽  
Image Position

Abstract

Influence of W, Re, Cr, and Mo on microstructural stability of the third generation Ni-based single crystal superalloys

2016 ◽  
Vol 31 (21) ◽  
pp. 3381-3389 ◽  
Author(s):  
Bo Wang ◽  
Jun Zhang ◽  
Taiwen Huang ◽  
Haijun Su ◽  
Zhuoran Li ◽  
...  
Keyword(s):  
Single Crystal ◽  
Third Generation ◽  
Microstructural Stability ◽  
The Third ◽  
Image Position

Abstract

Influence of Ru on the Microstructure of Ni-Base Single Crystal Superalloys

2011 ◽  
Vol 306-307 ◽  
pp. 562-571 ◽  
Author(s):  
Fei Sun ◽  
Jian Xin Zhang
Keyword(s):  
Single Crystal ◽  
Volume Fraction ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Solid Solution Strengthening ◽  
Refractory Elements ◽  
Tcp Phases ◽  
Solution Strengthening ◽  
Strengthening Element ◽  
Partitioning Behavior

Addition of Ru in Ni-base single crystal superalloys had been used to improve the elevated temperature strength and other multiple properties. Significant decreases in stacking fault energy of the γ phase and the volume fraction of γ′ phase are observed with the addition of Ru. As well as serving as an effective solid-solution strengthening element in high refractory content Ni-base single crystal superalloys, Ru additions are able to effectively strengthen both the γ and γ′ phases and suppress the formation of TCP phases. Due to the changes in the partitioning behavior of elements and the slight decrease in the supersaturation of refractory elements in γ phase associated with Ru additions, high temperature creep resistance and the microstructural stability of the alloy are improved remarkable. The influence of Ru on the microstructure of Ni-base single crystal superalloys is reviewed.

Effects of Re on Microstructure of Ni3Al-Based Single Crystal Superalloys

2014 ◽  
Vol 788 ◽  
pp. 498-503 ◽  
Author(s):  
Jing Yang Chen ◽  
Ming Xue ◽  
Xin Tang ◽  
La Mei Cao
Keyword(s):  
Single Crystal ◽  
Volume Fraction ◽  
Lattice Misfit ◽  
Alloying Elements ◽  
Microstructural Stability ◽  
Segregation Ratios ◽  
Kinetics Of ◽  
Liquidus Temperatures

The effects of Re on solidus/liquidus temperatures, solidification segregation characteristics of alloying elements, γ′ morphology and volume fraction as well as microstructural stability at 1150 °C have been investigated in two experimental Ni3Al-based single crystal superalloys with and without Re (1.0 wt%) addition. The results indicated that Re addition increased the solidus/liquidus temperatures. The segregation characteristics of Ni3Al-based single crystal superalloys were similar with Ni-based single crystal superalloys, and the solidification segregation ratios of W and Mo increased slightly due to Re addition. Meanwhile, Re addition resulted in more negative lattice misfit, more cuboidal γ′ phase and higher γ′ volume fraction. The kinetics of γ′ coarsening and rafting at 1150 °C was lowered substantially compared with the addition of Re.

scholarly journals Design of a High Efficiency Industrial Turbine Blade Utilizing Third Generation Single Crystal Alloy CMSX®-10

1997 ◽  
Author(s):  
Michael D. Fitzpatrick ◽  
William D. Brentnall ◽  
Andrew Meier ◽  
Gary L. Erickson ◽  
Gary DeBoer
Keyword(s):  
Single Crystal ◽  
Gas Turbines ◽  
Life Cycle Cost ◽  
High Efficiency ◽  
The United States ◽  
Department Of Energy ◽  
Advanced Materials ◽  
United States Department ◽  
Third Generation ◽  
Microstructural Stability

Future advancements in the efficiency and reliability of Industrial Gas Turbines (IGT) will be closely tied to the application of advanced materials, together with increasingly sophisticated turbine hot section designs. An example of this trend is illustrated by the recent design of a first stage blade component for an advanced IGT concept utilizing the third generation single crystal superalloy CMSX-10. It is anticipated that alloy CMSX-10 will permit the use of increased turbine firing temperatures with reduced cooling flows compared to previous recuperated turbine designs, while maintaining acceptable blade durability and life-cycle cost. This paper discusses some of the design/materials analyses and cost studies performed on the blade, which ultimately led to the consideration of alloy CMSX-10 for the IGT application. The solid modeling and finite element blade design methods which allowed the incorporation of state-of-the-art cooling technology and aerodynamics are described. Alloy CMSX-10 characteristics, particularly mechanical properties and microstructural stability considerations, are discussed. Additionally, the results of a recent casting demonstration in an IGT blade configuration are presented. Finally, future tasks supporting the application of the alloy are outlined, such as coatings development efforts and the DOE/ORNL sponsored Land Based Turbine Casting Initiative; activities sponsored through a cooperative agreement with the United States Department of Energy within the Advanced Turbine System (ATS) Program.

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