Fractal characterization of pore microstructure evolution in carbon/carbon composites

2008 ◽  
Vol 52 (4) ◽  
pp. 871-877 ◽  
Author(s):  
MiaoLing Li ◽  
LeHua Qi ◽  
HeJun Li ◽  
GuoZhong Xu
Keyword(s):  
Microstructure Evolution ◽  
Carbon Composites ◽  
Pore Microstructure

Application of Atom Probe Microanalysis for Understanding Microstructure Evolution in Nickel Base Superalloy Welds

2000 ◽  
Vol 6 (S2) ◽  
pp. 350-351
Author(s):  
S. S. Babu ◽  
S. A. David ◽  
M. K. Miller
Keyword(s):  
Microstructure Evolution ◽  
Predictive Models ◽  
Strong Relationship ◽  
Atom Probe ◽  
Systematic Investigation ◽  
Nickel Base Superalloy ◽  
Cooling Conditions ◽  
Nickel Base ◽  
Base Superalloy

The characterization of the microstructure evolution during welding of nickel base superalloys is required for efficient reuse and reclamation of used and failed components. Previous atom probe analysis of electron-beam and laser-beam welds revealed complex alloying elemental partitioning between the γ and γ phases. Rapid cooling conditions in the weld leads to non-equilibrium partitioning and large amplitude Cr and Co levels in the γ phase. These results indicated that there is a strong relationship between weld cooling rate and the precipitation of γ′ precipitates from the γ phase. To understand and develop predictive models, a systematic investigation of the microstructure evolution in CM247DS alloy under controlled thermomechanical conditions are being performed. This paper describes some recent results on the elemental partitioning between γ and γ′ phases obtained with atom probe microanalysis.

scholarly journals Austenite Reverse Transformation in a Q&P Route of Mn and Ni Added Steels

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 862 ◽  
Author(s):  
Maribel Arribas ◽  
Teresa Gutiérrez ◽  
Eider Del Molino ◽  
Artem Arlazarov ◽  
Irene De Diego-Calderón ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Microstructural Characterization ◽  
Carbon Steels ◽  
Reverse Transformation ◽  
Low Carbon ◽  
Effective Mechanism ◽  
Low Carbon Steels ◽  
Heat Treated ◽  
Final Microstructure

In this work, four low carbon steels with different contents of Mn and Ni were heat treated by quenching and partitioning (Q&P) cycles where high partitioning temperatures, in the range of 550 °C–650 °C, were applied. In order to elucidate the effect of applying these high partitioning temperatures with respect to more common Q&P cycles, the materials were also heat treated considering a partitioning temperature of 400 °C. The microstructure evolution during the Q&P cycles was studied by means of dilatometry tests. The microstructural characterization of the treated materials revealed that austenite retention strongly depended on the alloy content and partitioning conditions. It was shown that the occurrence of austenite reverse transformation (ART) in the partitioning stage in some of the alloys and conditions was a very effective mechanism to increase the austenite content in the final microstructure. However, the enhancement of tensile properties achieved by the application of high partitioning temperature cycles was not significant.

Synthesis and characterization of Si-substituted hydroxyapatite bioactive coating for SiC-coated carbon/carbon composites

2017 ◽  
Vol 43 (1) ◽  
pp. 1410-1414 ◽  
Author(s):  
Li Kezhi ◽  
Guo Qian ◽  
Zhang Leilei ◽  
Zhang Yulei ◽  
Liu Shoujie ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Carbon Composites ◽  
Bioactive Coating ◽  
Coated Carbon

Characterization of carbon-carbon composites—I

Carbon ◽  
1981 ◽  
Vol 19 (1) ◽  
pp. 1-5 ◽  
Author(s):  
P. Ehrburger ◽  
J. Lahaye ◽  
C. Bourgeois
Keyword(s):  
Carbon Composites
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