scholarly journals Application of Exponential Smoothing to Machining Precision of Nickel-based Superalloy Waspaloy

2020 ◽  
Vol 32 (3) ◽  
pp. 819
Author(s):  
Shao-Hsien Chen ◽  
Yu-Lun Ho
Keyword(s):  
Exponential Smoothing ◽  
Machining Precision ◽  
Nickel Based Superalloy

Surface Modification and its Influence on the Microstructure and Creep Resistance of Nickel Based Superalloy René 77 / Modyfikacja Powierzchniowa Oraz Jej Wpływ Na Mikrostrukture I Wytrzymałosc Na Pełzanie Odlewów Z Nadstopu Niklu Ren´E 77

2013 ◽  
Vol 58 (1) ◽  
pp. 95-98 ◽  
Author(s):  
M. Zielinska ◽  
J. Sieniawski
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Surface Modification ◽  
Turbine Blades ◽  
Processing Parameters ◽  
Grain Structure ◽  
Creep Tests ◽  
Cobalt Aluminate ◽  
Nickel Based Superalloy ◽  
Average Grain Size

Superalloy René 77 is very wide used for turbine blades, turbine disks of aircraft engines which work up to 1050°C. These elements are generally produced by the investment casting method. Turbine blades produced by conventional precision casting methods have coarse and inhomogeneous grain structure. Such a material often does not fulfil basic requirements, which concern mechanical properties for the stuff used in aeronautical engineering. The incorporation of controlled grain size improved mechanical properties. This control of grain size in the casting operation was accomplished by the control of processing parameters such as casting temperature, mould preheating temperature, and the use of grain nucleates in the face of the mould. For nickel and cobalt based superalloys, it was found that cobalt aluminate (CoAl2O4) has the best nucleating effect. The objective of this work was to determine the influence of the inoculant’s content (cobalt aluminate) in the surface layer of the ceramic mould on the microstructure and mechanical properties at high temperature of nickel based superalloy René 77. For this purpose, the ceramic moulds were made with different concentration of cobalt aluminate in the primary slurry was from 0 to 10% mass. in zirconium flour. Stepped and cylindrical samples were casted for microstructure and mechanical examinations. The average grain size of the matrix ( phase), was determined on the stepped samples. The influence of surface modification on the grain size of up to section thickness was considered. The microstructure investigations with the use of light microscopy and scanning electron microscopy (SEM) enable to examine the influence of the surface modification on the morphology of ’ phase and carbides precipitations. Verification of the influence of CoAl2O4 on the mechanical properties of castings were investigated on the basis of results obtained form creep tests.

Residual Stresses in High Speed Turning of Nickel-Based Superalloy*

2014 ◽  
Vol 69 (1) ◽  
pp. 46-53 ◽  
Author(s):  
R. L. Peng ◽  
J.-M. Zhou ◽  
S. Johansson ◽  
A. Bellinius ◽  
V. Bushlya ◽  
...  
Keyword(s):  
Residual Stresses ◽  
High Speed ◽  
High Speed Turning ◽  
Nickel Based Superalloy

Daily Tracking and Forecasting of the Global COVID-19 Pandemic Trend Using Holt–Winters Exponential Smoothing

2020 ◽  
Author(s):  
Zhanduo Zhang ◽  
Xiaona Wang ◽  
Hui Gong ◽  
Xin Liu ◽  
Huijuan Chen ◽  
...  
Keyword(s):  
Exponential Smoothing

Piezoelectric Response to Pressure of Aluminum Nitride Thin Films Prepared on Nickel-Based Superalloy Diaphragms

2006 ◽  
Vol 45 (6A) ◽  
pp. 5169-5173 ◽  
Author(s):  
Ichiro Ohshima ◽  
Morito Akiyama ◽  
Akira Kakami ◽  
Tatsuo Tabaru ◽  
Toshihiro Kamohara ◽  
...  
Keyword(s):  
Thin Films ◽  
Aluminum Nitride ◽  
Piezoelectric Response ◽  
Nickel Based Superalloy

Fitting exponential smoothing models with computer graphics

1989 ◽  
Vol 16 (3) ◽  
pp. 387-405
Author(s):  
Rafael G. Moras ◽  
Eric L. Blair
Keyword(s):  
Computer Graphics ◽  
Exponential Smoothing
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