The application of optical microscopy and electron-probe microanalysis to a mineral processing topic-the high-temperature reduction of ilmenite

1973 ◽  
Vol 99 (3) ◽  
pp. 237-250 ◽  
Author(s):  
D. G. Jones ◽  
J. F. Stephens
Keyword(s):  
High Temperature ◽  
Optical Microscopy ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Mineral Processing ◽  
Temperature Reduction

Microstructure and Compound Developed from Ce-As-Fe System at High Temperature

2012 ◽  
Vol 460 ◽  
pp. 103-106
Author(s):  
Sheng Tao Dou ◽  
Jin Zhu Zhang ◽  
Jun Huang
Keyword(s):  
High Temperature ◽  
Optical Microscopy ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Main Product ◽  
Binary Compound ◽  
Atomic Ratio ◽  
X Ray Diffraction ◽  
X Ray

The interaction among Cerium, Arsenic and Iron at high temperature in a pressure-tight reactor were studied by means of electron probe microanalysis, optical microscopy and X-ray diffraction to understand what compounds could be developed and how about their stability chemically should be. The result shows that the binary compound CeAs is the main product on condition that the atomic ratio of Cerium to Arsenic is 2:1. There are some Fe2Ce, Ce4As3 and Fe17Ce2 compounds developed meanwhile. The amount of Fe17Ce2 phase by the base of steel increased with time prolonging at high temperature

Microstructure and Compound Developed from La-As-Fe System at 1223K

2013 ◽  
Vol 702 ◽  
pp. 145-148 ◽  
Author(s):  
Xiao Dong Liu ◽  
Jin Zhu Zhang ◽  
Si Si Zhu
Keyword(s):  
Optical Microscopy ◽  
Ternary Compound ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Binary Compound ◽  
Atomic Ratio ◽  
X Ray Diffraction ◽  
Gray Phase ◽  
X Ray

The interaction among Lanthanum, Arsenic and Iron at 1223K were studied by means of electron probe microanalysis, optical microscopy and X-ray diffraction. The result shows that the gray phase might be a ternary compound La10Fe50As40, and the binary compound LaAs and the ternary compound La10Fe50As40 are the main interaction products when the atomic ratio of La to As is 1:3. The eutectic compound Fe2As can be precipitated from ferrite with the temperature decreasing.

On the Nature of the Growth of Bainitic α plates in Metastable β Ti Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 3684-3689
Author(s):  
S.M.C. van Bohemen ◽  
Jilt Sietsma ◽  
Sybrand van der Zwaag
Keyword(s):  
Grain Boundaries ◽  
Optical Microscopy ◽  
Growth Mechanism ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Morphological Transition ◽  
Ti Alloy ◽  
Lattice Structures ◽  
Transformation Mechanism ◽  
Ti Alloys

The growth mechanism of bainitic α plates in Ti-4.5Fe-6.8Mo-1.5Al, a metastable β Ti alloy, has been investigated by optical microscopy, electron probe microanalysis (EPMA) and dilatometry. The observations are compared with the transformation characteristics of primary α plates, which form at relatively high temperatures. The primary α plates form predominantly on β grain boundaries, whereas the bainitic α plates nucleate both at grain boundaries and intragranularly. It is shown that the morphological transition with decreasing temperature is associated with a change in transformation mechanism. The EPMA results show that the primary α plates are formed by a partitioning transformation. In contrast, the growth of the bainitic α plates is partitionless, followed by a post-transformation redistribution of Fe. This mechanism is similar to bainite in steel. The Fe diffusion from the supersaturated bainitic α plates to the β matrix causes the observed dilatation signal. The results of dilatometry in conjunction with optical microscopy indicate that a low misfit between the lattice structures exists, which is favourable for a partitionless transformation to occur at a low undercooling below T0.

Experimental Determination of Isothermal Section at 1050°C in the Fe-Nb-V Ternary System

2015 ◽  
Vol 757 ◽  
pp. 1-5
Author(s):  
Chang Jiang Liu ◽  
Qiu Juan Lv ◽  
Zhi Qing Guo ◽  
Yan Jiao Li ◽  
Jian Feng Guo
Keyword(s):  
Solid Solution ◽  
Isothermal Section ◽  
Ternary System ◽  
Phase Equilibria ◽  
Experimental Determination ◽  
Optical Microscopy ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Microalloyed Steels

The phase equilibria in the Fe-Nb-V ternary system were investigated by means of optical microscopy, electron probe microanalysis. One isothermal section in the Fe-Nb-V ternary system at 1050 °C was firstly experimentally established. Present experimental results indicate that: (1) there is a large (Nb, V) continuous bcc solid solution; (2) there are the larger solubilities of V in the FeNb and Fe2Nb phases. The newly determined phase equilibria in this system will provide important support for the development of microalloyed steels.

Study on Interaction among Cerium-Arsenic-Iron

2012 ◽  
Vol 482-484 ◽  
pp. 1281-1284
Author(s):  
Yuan Zhi Lin ◽  
Xiao Dong Liu ◽  
Jin Zhu Zhang
Keyword(s):  
Diffusion Coefficient ◽  
High Temperature ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Main Product ◽  
Atomic Ratio ◽  
X Ray Diffraction ◽  
Bright Field ◽  
Gray Phase ◽  
X Ray

The interaction in the Cerium-Arsenic-Iron system at high temperature were studied by means of electron probe microanalysis, optical microscopy and X-ray diffraction. The results show that the CeAs is the main product when the atomic ratio of Cerium to Arsenic is 1:2, and a light gray phase in bright field might be a ternary compound Ce12Fe57.5As41. The diffusion coefficient of Arsenic in iron was calculated as 1.606×10-13m2/S.

Experimental Determination of Isothermal Section at 900°C in the Fe-Nb-V Ternary System

2013 ◽  
Vol 546 ◽  
pp. 107-111
Author(s):  
Chang Jiang Liu ◽  
Yan Jiao Li ◽  
Zhi Qing Guo ◽  
Qiu Juan Lv ◽  
Fang Xie ◽  
...  
Keyword(s):  
Solid Solution ◽  
Isothermal Section ◽  
Ternary System ◽  
Phase Equilibria ◽  
Experimental Determination ◽  
Optical Microscopy ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Microalloyed Steels

The phase equilibria in the Fe-Nb-V ternary system were investigated by means of optical microscopy, electron probe microanalysis. One isothermal section in the Fe-Nb-V ternary system at 900 °C was firstly experimentally established. Present experimental results indicate that: (1) there is a large (Nb, V) continuous bcc solid solution; (2) there are the larger solubilities of V in the FeNb and Fe2Nb phases. The newly determined phase equilibria in this system will provide important support for the development of microalloyed steels.

scholarly journals Fracture analysis of the circulating pump bolts

2020 ◽  
Vol 213 ◽  
pp. 02017
Author(s):  
Chengjun Jiang ◽  
Wei Wang ◽  
Xiaohui Zou ◽  
Jifeng Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Power Plant ◽  
Stress Corrosion ◽  
Optical Microscopy ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Fracture Analysis ◽  
Chloride Ions ◽  
Scanning Electron

The microstructure, micrograph of the fracture sections and the alloy elements distribution of the fractured flange-connecting bolts of 3# circulating pump in a power plant were analyzed by the scanning electron microscopy, the optical microscopy and the electron probe microanalysis. The results showed that the failed bolts’ material is not the design material, and failure of the bolts is due to the stress corrosion crack propagation of the bolts’ austenitic material by chloride ions in seawater.

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