Prediction of Shrinkage Porosity in Ti-46Al-8Nb Tilt-Casting Using the Niyama Criterion Function

2013 ◽  
Vol 7 (4) ◽  
pp. 35-42 ◽  
Author(s):  
I. Khaled
Keyword(s):  
Shrinkage Porosity ◽  
Criterion Function ◽  
Niyama Criterion

Application of Niyama criterion for predicting of shrinkage porosity of shaped castings

2021 ◽  
pp. 531-536
Author(s):  
E.S. Ivanina ◽  
V.P. Monastyrsky
Keyword(s):  
Technological Process ◽  
Computational Experiment ◽  
Critical Value ◽  
Shrinkage Porosity ◽  
Critical Values ◽  
Niyama Criterion ◽  
Cooling Conditions ◽  
The Given

Method for determining of the critical value of the Niyama criterion based on computational experiment is developed. It is found that the critical value of the Niyama criterion depends on the alloy cooling conditions and therefore is applicable only to the given technological process. The critical values of the Niyama criterion for casting s made of ML10 and 14Kh17N2L alloys obtained in permanent metal moulds and in moulds of coldhardening mixtures are determined. The obtained results are confirmed on shaped casting.

scholarly journals Precipitation behavior near shrinkage porosity in a large sand casting of Haynes 282 alloy

Materialia ◽  
2021 ◽  
Vol 15 ◽  
pp. 101035
Author(s):  
Ling Wang ◽  
Kinga A. Unocic ◽  
Peter F. Tortorelli ◽  
Michael Santella ◽  
Xiang  (Frank) Chen
Keyword(s):  
Shrinkage Porosity ◽  
Sand Casting ◽  
Precipitation Behavior

scholarly journals EVOLUTIONARY STRATEGY (μ+λ) AS AN INSTRUMENT FOR DETERMINING DEFORMATION PARAMETERS OF STEEL STRUCTURES

2013 ◽  
Vol 95 (1) ◽  
pp. 23-35 ◽  
Author(s):  
Maria Mrówczyńska
Keyword(s):  
Evolutionary Algorithm ◽  
Global Minimum ◽  
Steel Structures ◽  
Regression Function ◽  
Evolutionary Strategy ◽  
Estimation Of Parameters ◽  
Criterion Function ◽  
Orthogonal Regression ◽  
Deformation Parameters ◽  
Theoretical Analyses

Abstract The article presents the use of an evolutionary algorithm for determining the shape of the guy rope sag of a steel smokestack. The author excludes the analysis of the operation of the rope, and discusses only the problem of determining parameters of the function of the adaption of the rope sag curve into empirical data, obtained by the geodetic method. The estimation of parameters of the curve and the characteristics of the accuracy of its adaption into experimental data were carried out by means of an evolutionary algorithm with the use of an evolutionary strategy (μ+λ). The correctness of the strategy presented in the paper, as an instrument for searching for a global minimum of a criterion function, has been presented using as an example the minimisation of a certain two dimensional function and the estimation of parameters of an ordinary and orthogonal regression function. Previous theoretical analyses have also been used for determining parameters of the guy rope sag of a steel smokestack, which is measured periodically. In addition approximate values of the pull forces in the guy ropes have been calculated.

Shrinkage, porosity and density behaviour during convective drying of spirulina

2010 ◽  
Vol 97 (3) ◽  
pp. 410-418 ◽  
Author(s):  
A.O. Dissa ◽  
H. Desmorieux ◽  
P.W. Savadogo ◽  
B.G. Segda ◽  
J. Koulidiati
Keyword(s):  
Shrinkage Porosity ◽  
Convective Drying

Casting Process Solutions Optimization of LFC Forklift Box

2014 ◽  
Vol 571-572 ◽  
pp. 1091-1096
Author(s):  
Guang Sheng Zhang ◽  
Fei Zhang
Keyword(s):  
Orthogonal Experiment ◽  
Casting Process ◽  
Shrinkage Porosity ◽  
Simulation Software ◽  
Technology Program ◽  
Original Process ◽  
Porosity Defects ◽  
Process Solutions ◽  
Technology Solution ◽  
Casting Simulation Software

There are many advantages in producing forklift box through the LFC. However, we found shrinkage porosity defects in the interior of castings through simulating the original process by ProCAST casting simulation software. Therefore, we analyzed the defects and improved the technology program. firstly, increased riser in position of shrinkage, Secondly, changed the filling’s way, lastly, selected the best temperature and vacuum by the orthogonal experiment and determined the best technology solution. we found the shrinkage porosity defects have been removed by the improved process. We found the production consistent with the simulation results through verification. Therefore we verify the accuracy of the ProCAST.

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