High temperature shakedown of a 2nd generation nickel-base single crystal superalloy under tension-torsion loadings

2022 ◽  
Vol 832 ◽  
pp. 142457
Author(s):  
Zhen Zhang ◽  
Shen Wang ◽  
Bailey Brown ◽  
I. Soner Cinoglu ◽  
Natasha Vermaak ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystal Superalloy ◽  
2Nd Generation ◽  
Nickel Base

Creep Behavior of a 4.5% Re Nickel-Base Single Crystal Superalloy at High Temperature

2015 ◽  
Vol 750 ◽  
pp. 139-144 ◽  
Author(s):  
De Long Shu ◽  
Su Gui Tian ◽  
Xin Ding ◽  
Jing Wu ◽  
Qiu Yang Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Single Crystal ◽  
Deformation Mechanism ◽  
Creep Property ◽  
Single Crystal Superalloy ◽  
Micro Cracks ◽  
Initiation And Propagation ◽  
Temperature Ranges ◽  
Nickel Base

By means of heat treatment and creep property measurement, an investigation has made into the creep behaviors of a containing 4.5% Re nickel-base single crystal superalloy at high temperature. Results show that the elements W, Mo and Re are enriched in the dendrite arm regions, the elements Al, Ta, Cr and Co are enriched in the inter-dendrite region, and the segregation extent of the elements may be obviously reduced by means of heat treatment at high temperature. In the temperature ranges of 1070--1100 °C, the 4.5% Re single crystal nickel-based superallloy displays a better creep resistance and longer creep life. The deformation mechanism of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. In the later stage of creep, the deformation mechanism of alloy is dislocations slipping in the γ matrix, and shearing into the rafted γ′ phase, which may promote the initiation and propagation of the micro-cracks at the interfaces of γ/γ′ phases up to the occurrence of creep fracture.

A Viscoplastic Theory for Anisotropic Materials

1992 ◽  
Vol 114 (1) ◽  
pp. 97-104 ◽  
Author(s):  
D. Nouailhas ◽  
A. D. Freed
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Anisotropic Materials ◽  
Single Crystal Superalloy ◽  
Cyclic Behavior ◽  
Internal Variables ◽  
Cubic Symmetry ◽  
Viscoplastic Model ◽  
Nickel Base

The purpose of this work is the development of a unified, cyclic, viscoplastic model for anisotropic materials. The first part of the paper presents the foundations of the model in the framework of thermodynamics with internal variables. The second part considers the particular case of cubic symmetry, and addresses the cyclic behavior of a nickel-base single-crystal superalloy, CMSX-2, at high temperature (950°C).

High Temperature Multiaxial Creep-Fatigue Life Prediction for YH61 Nickel-Base Single Crystal Superalloy

2014 ◽  
Vol 891-892 ◽  
pp. 1027-1032 ◽  
Author(s):  
Wen Zhu Wang ◽  
Masao Sakane ◽  
Takamoto Itoh ◽  
Akira Yoshinari ◽  
Nobuhiro Isobe ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Evaluation Method ◽  
Biaxial Tension ◽  
Fatigue Tests ◽  
Single Crystal Superalloy ◽  
Compression Tests ◽  
Creep Fatigue ◽  
Multiaxial Creep ◽  
Nickel Base

This paper discusses an evaluation method of creep-fatigue lives of YH61 single crystal superalloy under multiaxial loading at high temperature. Three types of creep-fatigue tests were performed using three types of the single crystalsuperalloy specimens at 1173K. They were push-pull tests using solid bar specimens, tension-torsion tests using hollow cylinder specimens and biaxial tension-compression tests using cruciform specimens. Anisotropic strain and Mises stress in combination with frequency modified fatigue equation were applied for evaluating the creep-fatigue lives in the three types of tests. The former parameter gave a relatively large scatter but the latter parameter a small scatter in the correlation.

Sign in / Sign up

Export Citation Format

Share Document