strip casting
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Author(s):  
Raudhah Othman ◽  
Thomas Dorin ◽  
Nikki Stanford ◽  
Peter Hodgson

2021 ◽  
Vol 59 (12) ◽  
pp. 870-879
Author(s):  
Kyoung-Wook Kim ◽  
Min-Seok Baek ◽  
Kwangjun Euh ◽  
Kee-Ahn Lee

Al 7075 alloy was manufactured using the twin-roll strip casting (TRC) process, and the mechanical and wear properties of the fabricated TRC process were investigated. To compare the properties of the alloy manufactured by TRC, another Al 7075 alloy was fabricated by conventional direct chill (DC) casting as a comparative material. Based on initial microstructure observations, the Al 7075 alloy manufactured by the DC process showed relatively elongated grains compared to the Al 7075 alloy by TRC process. In both alloys, η(MgZn2) phases were present at the grain and grain boundaries. In the Al 7075 alloy manufactured by the DC process, the η(MgZn2) phases were coarse with a size of ~86 nm and were mainly concentrated in the local area. However, the Al 7075 alloy manufactured by TRC had relatively fine η(MgZn2) phases size of ~40 nm, and they were evenly distributed throughout the matrix. When the mechanical properties of the two alloys were compared, the TRC process showed higher hardness and strength properties than the DC process. In room temperature wear test results, the TRC process exhibited lower weight loss and wear rates compared to the DC process at all wear loads. In other words, the TRC process resulted in relatively superior wear resistance properties compared to the conventional DC process. The wear behavior of both alloys changed from abrasive wear to adhesive wear as the wear load increased. However, the TRC process maintained abrasive wear up to higher loads. Based on the above results, a correlation between the microstructure and wear mechanism of the Al 7075 alloy manufactured by TRC is also suggested.


2021 ◽  
Vol 139 ◽  
pp. 107373
Author(s):  
Y.X. Li ◽  
Y.C. Wu ◽  
X.C. Zhong ◽  
S.M. Wu ◽  
C.L. Liu ◽  
...  

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1815
Author(s):  
Feng Fang ◽  
Diwen Hou ◽  
Zhilei Wang ◽  
Shangfeng Che ◽  
Yuanxiang Zhang ◽  
...  

Based on conventional hot rolling processes and strip casting processes, Cu precipitation strengthening is used to improve the strength of non-oriented silicon steel in order to meet the requirements of high-speed driving motors of electric vehicles. Microstructure evolution was studied, and the effects of Cu precipitates on magnetic and mechanical properties are discussed. Compared with conventional processes, non-oriented silicon steel prepared by strip casting exhibited advantages with regard to microstructure optimization with coarse grain and {100} texture. Two-stage rolling processes were more beneficial for uniform microstructure, coarse grains and improved texture. The high magnetic induction B50 of 1.762 T and low core losses with P1.5/50, P1.0/400 and P1.0/1000 of 1.93, 11.63 and 44.87 W/kg, respectively, were obtained in 0.20 mm sheets in strip casting. Cu precipitates significantly improved yield strength over ~120 MPa without deteriorating magnetic properties both in conventional process and strip casting. In the peak stage aged at 550 °C for 120 min, Cu precipitates retained bcc structure and were coherent with the matrix, and the yield strength of the 0.20 mm sheet was as high as 501 MPa in strip casting. The main mechanism of precipitation strengthening was attributed to coherency strengthening and modulus strengthening. The results indicated that balanced magnetic and mechanical properties can be achieved in thin-gauge non-oriented silicon steel with Cu addition in strip casting.


Author(s):  
Feng Fang ◽  
Shangfeng Che ◽  
Diwen Hou ◽  
Yuanxiang Zhang ◽  
Yang Wang ◽  
...  

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5274
Author(s):  
Wanlin Wang ◽  
Song Mao ◽  
Hualong Zhang ◽  
Cheng Lu ◽  
Peisheng Lyu

A combination of droplet solidification tester and confocal laser scanning microscope was used to simulate subrapid solidification and secondary cooling process pertinent to the strip casting. The IF steel droplet had a delamination structure and the bottom part went through sub-rapid solidification. During secondary cooling, γ/α transformation mechanism belonged to interface-controlled massive transformation and the ferrite grains grew quickly. With the increase of cooling rate, the γ/α transformation temperature decreased and the incubation period and phase transformation duration reduced. The hardness showed a slight increase due to fine-grain strengthening. With coiling temperature increasing from 600 °C to 800 °C, the grain size became larger, precipitates became coarse, and defects in grain were recovered. Consequently, the hardness decreased.


Author(s):  
C.Y. Zhang ◽  
G. Yuan ◽  
Y.X. Zhang ◽  
C.Y. Liu ◽  
F. Fang ◽  
...  

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