Investigating the Effect of Cooling Rate on the Secondary Dendrite Arm Spacing in Titanium Alloys

2020 ◽  
Author(s):  
◽  
Chen Liu
Keyword(s):  
Titanium Alloys ◽  
Cooling Rate ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing

Influence of Primary Austenite on the Nucleation of Eutectic Cells

2010 ◽  
Vol 457 ◽  
pp. 61-66 ◽  
Author(s):  
Lennart Elmquist ◽  
Attila Diószegi ◽  
Peter Svidró
Keyword(s):  
Cooling Rate ◽  
Iron Powder ◽  
Cell Size ◽  
Eutectic Solidification ◽  
Eutectic Cell ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing ◽  
Primary Austenite ◽  
Dendritic Network ◽  
Commercial Inoculant

The solidification of gray cast iron starts with the precipitation of primary austenite. This phase nucleates either as columnar or equiaxed dendrites depending on whether nucleation occurs on the mould wall or on particles and impurities in the melt. In this work, the nucleation of primary austenite and its influence on the eutectic solidification has been investigated using different amounts of iron powder as inoculants. Besides, the influence of different cooling rates was also examined. Within each austenite grain there is a microstructure, and this microstructure was investigated using a color etching technique to reveal the eutectic cells and the dendritic network. It is shown how the cooling rate affects the dendritic network and the secondary dendrite arm spacing, and how the microstructure can be related to the macrostructure through dendrite arm spacing. The secondary dendrite arm spacing is a quantification of the primary austenite belonging to the primary solidification, and it will be shown how the eutectic cell size is related to the secondary dendrite arm spacing. The total amount of oxygen influences the microstructural dimensions. This effect, on the other hand, is influenced by the cooling rate. The number of eutectic cells versus eutectic cell size show two distinct behaviors depending on whether being inoculated with iron powder or a mixture of iron powder and commercial inoculant. The addition of a commercial inoculant decreases eutectic cell size and increases the number of cells, while iron powder almost only changes cell size.

scholarly journals Cooling Rate Dependence of Secondary Dendrite Arm Spacing in Nickel-Based Super Alloys

1997 ◽  
Vol 61 (8) ◽  
pp. 781-782
Author(s):  
Takayuki Mamiya ◽  
Yoshihito Ogasawara ◽  
Shinji Sato ◽  
Toshio Suzuki ◽  
Akira Yoshinari
Keyword(s):  
Cooling Rate ◽  
Rate Dependence ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing

Evolution of as-Cast Microstructure of Mg-Al Alloys with Solute Content and Cooling Rate

2011 ◽  
Vol 409 ◽  
pp. 362-367 ◽  
Author(s):  
M. Paliwal ◽  
Dae H. Kang ◽  
Elhachmi Essadiqi ◽  
In Ho Jung
Keyword(s):  
Cooling Rate ◽  
Phase Formation ◽  
Microstructural Evolution ◽  
Al Alloys ◽  
Second Phase ◽  
Solute Content ◽  
Rate Range ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing ◽  
Cast Microstructure

Although numerous solidification experiments have been conducted for Al, Cu and Si alloys to investigate microstructural features like primary and secondary dendrite arm spacing, solute distribution with in secondary arms and second phase fraction, no systematic solidification study on Mg alloys has been performed to understand the evolution of microstructural features as a function of cooling rate and solute content. The present study focuses on the experimental microstructural evolution of Mg-3, 6 and 9 wt. % Al alloys in the cooling rate range of 1 K/sec to 1000 K/sec. The results suggest that secondary dendrite arm spacing and amount of second phase formation are strongly dependent on both solute content and cooling rate.

Estimation of the Cooling Rate on the Basis of Secondary Dendrite Arm Spacing in Case of Continuous Cast Steel Slab

2006 ◽  
Vol 508 ◽  
pp. 245-250 ◽  
Author(s):  
Csaba Hoó ◽  
Ilona Teleszky ◽  
András Roósz ◽  
Zsolt Csepeli
Keyword(s):  
Cooling Rate ◽  
Cast Steel ◽  
Continuous Cast ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing ◽  
Cooling Conditions ◽  
Steel Slab ◽  
Solidification Processes ◽  
Continuous Cast Steel ◽  
The Relationship

The different solidification processes occuring in steels can be well studied by using the microstructure investigation. The microstructure can be observed after the sample preparation by using a special type of Oberhoffer etching. The changes in the cooling rate can be described by determining the secondary dendrite arm spacing. A relative cooling rate can be calculated by applying the relationship between the secondary dendrite arm spacing and the cooling rate which characterises the changes of cooling conditions in the ingot during the solidification..

scholarly journals The Effect of Major Alloying Elements on the Size of Secondary Dendrite Arm Spacing in the As-Cast Al-Si-Cu Alloys

2012 ◽  
Vol 12 (1) ◽  
pp. 19-24 ◽  
Author(s):  
M. Djurdjevič ◽  
M. Grzinčič
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Alloy Composition ◽  
Control Structure ◽  
Alloying Elements ◽  
Comprehensive Understanding ◽  
Secondary Dendrite Arm Spacing ◽  
Dendrite Arm Spacing ◽  
Cu Alloys ◽  
Metal Treatment

The Effect of Major Alloying Elements on the Size of Secondary Dendrite Arm Spacing in the As-Cast Al-Si-Cu Alloys A comprehensive understanding of melt quality is of paramount importance for the control and prediction of actual casting characteristics. Among many phenomenon that occur during the solidification of castings, there are four that control structure and consequently mechanical properties: chemical composition, liquid metal treatment, cooling rate and temperature gradient. The cooling rate and alloy composition are most important among them. This paper investigates the effect of the major alloying elements (silicon and copper) of Al-Si-Cu alloys on the size of secondary dendrite arm spacing. It has been shown that both alloying elements have reasonable influence on the refinement of this solidification parameter.

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