Effect of Rare Earth Element Ce and Heat Treatment Process on Impact Toughness and Microstructural Developments of 27Co-Fe Alloy

2021 ◽  
Author(s):  
Keke Xing ◽  
Aizhi Sun ◽  
Wenjiang Qiang ◽  
Yuhui Wang ◽  
Fen Zhang
Keyword(s):  
Heat Treatment ◽  
Rare Earth ◽  
Impact Toughness ◽  
Rare Earth Element ◽  
Earth Element ◽  
Treatment Process ◽  
Heat Treatment Process

Crystallization behavior, Al-Ce intermetallic formation, and microstructure refinement of near-eutectic Al–Si alloys by rare-earth element additions

2020 ◽  
Vol 111 (11) ◽  
pp. 938-952
Author(s):  
Bo Chi ◽  
Zhiming Shi ◽  
Cunquan Wang ◽  
Liming Wang ◽  
Hao Lian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Crystallization Behavior ◽  
Earth Element ◽  
Microstructural Refinement ◽  
Preferential Growth ◽  
Intermetallic Formation ◽  
The Matrix

Abstract Near-eutectic Al-Si alloys have low strength and high brittleness because of the presence of many eutectic b-Si flakes, needle-like Al-Fe-Si intermetallics, and coarse α-Al grains. This study disclosed the effects of cerium-rich RE (rare earth) element modification on orientation characters of crystals, formation of Al-Ce compounds, and microstructural refinement to improve the microstructure and mechanical properties of the alloys. The RE addition depressed preferential growth along the close-packed and/or sub-closepacked planes and promoted growth along the non-closepacked planes, in which La and other elements were dissolved into needle-like Al11Ce3 phase. When the temperature decreased, Al11Ce3 was preferentially crystallized from the melts and then devitrified by attaching to the surface of β-Al5FeSi needles. Moreover, many small Al11Ce3 particles were precipitated in the matrix and on the Si surface by a T6 heat treatment. Eutectic β-Si phases were constructed into discontinuous networks, short rods, and even particles by RE additions, which were further transformed into fine nodules following the T6 treatment. α-Al grains and primary β-Al5FeSi needles were simultaneously refined. The addition of 1.0 wt.% REs and subsequent T6 treatment yielded the highest tensile strength, elongation, and hardness of the alloy.

Study on the Corrosion Resistance of Magnesium Alloy AZ81 with Rare Earth

2011 ◽  
Vol 686 ◽  
pp. 332-336 ◽  
Author(s):  
Yu Cai Wu ◽  
Rui He ◽  
Lei Li
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
T6 Heat Treatment ◽  
Treatment Procedures ◽  
Different Content ◽  
Human Fluid ◽  
Rare Earth La

The influences of the different content of Rare earth La on the corrosion resistance of AZ81 in the simulated human fluid were studied. In order to further improve the corrosion resistance, different heat treatment procedures were studied. Results showed that with the increase of content of rare earth La, the grain size was refined and the corrosion resistance increased. The corrosion resistance was improved after T6 heat treatment (solid solution+ aging). Microstructure analysis showed that β-phases were precipitated in the T6 heat treatment process. Those fine β phases acted as corrosion barrier and impeded the corrosion extending.

scholarly journals Effect of Rare Earth Element La on Corrosion Resistance of Powder Zinc Coating: Experiment and First Principle Calculation

2021 ◽  
Vol 2101 (1) ◽  
pp. 012058
Author(s):  
J P Xin ◽  
S Y Zhang ◽  
S P Hu
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Salt Spray ◽  
Zinc Coating ◽  
Chemical Heat Treatment ◽  
Chemical Heat ◽  
The Rare Earth

Abstract Using a combination of first-principles calculations and experimental studies to study the effect of La on the corrosion resistance of Powder sherardizing layer in metal structures. Compared to other sherardizing rare earth elements (Re), La has better adsorption with the iron matrix and has the lowest binding energy on the adsorption surface (111) of the Fe matrix. Therefore, the rare earth element La is added to the powder sherardizing process for the rare earth chemical heat treatment to reduce the defects of the powder sherardizing faults formed, improve the surface uniformity and the quality of the permeation layer. On the basis of calculation, La element was added in the process of powder sherardizing, and the corrosion performance of the formed powder galvanizing layer was studied. After alternating salt spray experiments, the degree of corrosion of the layer is relatively small and the corrosion products are predominantly layered and spherical. Electrochemical tests of the layer show that the corrosion resistance of the layer after the rare earth chemical heat treatment has improved.

Contributions of Rare Earth Element (La,Ce) Addition to the Impact Toughness of Low Carbon Cast Niobium Microalloyed Steels

2018 ◽  
Vol 24 (4) ◽  
pp. 773-788 ◽  
Author(s):  
Hadi Torkamani ◽  
Shahram Raygan ◽  
Carlos Garcia Mateo ◽  
Jafar Rassizadehghani ◽  
Yahya Palizdar ◽  
...  
Keyword(s):  
Rare Earth ◽  
Impact Toughness ◽  
Rare Earth Element ◽  
Earth Element ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
The Impact

Effect of heat treatment on the microstructure and properties of 25Cr2MoVA petroleum casing steel

2021 ◽  
Vol 112 (1) ◽  
pp. 78-84
Author(s):  
Pengjun Cao ◽  
Yilong Zhang ◽  
Kejian Li ◽  
Jiling Dong ◽  
Wei Wu
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Impact Toughness ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Maximum Hardness ◽  
Quenching Temperature ◽  
Tempering Temperature ◽  
The Impact

Abstract The 25Cr2MoVA steel was subjected to various heat treatments. We found that the hardness increased when the quenching temperature was in the range of 870 – 910 °C, and then it decreased for the temperature of 910 – 990 °C. The maximum hardness was 553 HV after quenching from 910 °C. Following quenching from 910°C, the 25Cr2Mo-VA steel was tempered in the temperature range of 560 to 750 °C. With an increase in the tempering temperature, the hardness and tensile strength of the material decreased, while the impact toughness increased; the corrosion resistance increased initially and then decreased. The best heat treatment process for the 25Cr2MoVA steel involved quenching form 910 °C and tempering at 650°C for 1 h, the hardness was 362 HV, the tensile strength reached 1 310 MPa, the impact energy reached 149 J, and the material exhibited the best corrosion resistance.

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