Metallurgical and Materials Transactions A

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ISSN / EISSN : 1073-5615 / 1543-1916
Published by: Springer Nature (10.1007)
Total articles ≅ 27,489
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Guozheng Zha, Yun Zhao, Huan Luo, Wenlong Jiang, , Bin Yang
Published: 3 October 2022
Metallurgical and Materials Transactions B pp 1-9; https://doi.org/10.1007/s11663-022-02647-7

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Published: 3 October 2022
Metallurgical and Materials Transactions B pp 1-18; https://doi.org/10.1007/s11663-022-02640-0

Abstract:
In this work, pyrometallurgical treatment of non-ferrous iron residue was studied. This approach aimed to recover the valuable metals and convert the residue into reusable benign slag using hydrogen as a non-fossil reducing agent. The pyrometallurgical treatment for this type of residue involves pretreatment prior to two stages, oxidation and reduction. Hydrogen was employed as a reducing agent in slag cleaning. The reduction tests were performed at temperatures of 1200 °C, 1250 °C, and 1300 °C using H2 and N2 gases to form the reducing gas atmosphere. The results show that H2 is an effective reductant because reduction proceeded rapidly, forming speiss droplets within the slag already after 10 minutes. The laboratory-scale experiments suggest that slags or other residues obtained from metallurgical processes can be further cleaned in a fuming process using hydrogen and its mixtures to obtain environmentally friendly cleaner slag with respect of volatile metals. The results also show that one can tune the reduction and control the formation of metallic iron during the process. Thermodynamic modeling was also performed to simulate the fuming stage, i.e., reduction of the slag. Metal alloy formation as well as elemental distributions between metal and slag were studied, and results from thermodynamic modeling agree well with experimental results.
Yang Bai, , Xin Yu, Liyang Wang, Beibei Zhao, Xiangyang Kong
Published: 2 October 2022
Metallurgical and Materials Transactions A pp 1-14; https://doi.org/10.1007/s11661-022-06820-0

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, Lars-Erik Lindgren, Paul Åkerström
Published: 30 September 2022
Metallurgical and Materials Transactions A pp 1-13; https://doi.org/10.1007/s11661-022-06819-7

Abstract:
A dislocation density-based model for alloy 718 in the annealed state is proposed in order to accurately describe the deformation behavior of this alloy for a wide range of thermo-mechanical loadings. The model accounts for numerous microstructural mechanisms, including strain hardening, grain size effect, dynamic strain aging (DSA), solid solution strengthening, as well as phonon and electron drag which affects dislocation movements at high strain rates. Two types of recovery mechanisms are also included: recovery due to dislocation glide and recovery associated with cross-slip of screw dislocations. The model is calibrated using experimentally determined stress–strain curves for both low and high strain rates in the order of 10–3 to 103 s−1, and for temperatures in the range 20 °C to 800 °C. The stress–strain data computed with the model are in good agreement with the experimental data. The inclusion of DSA is found to be effective in the combination of temperatures and strain rates corresponding to experimental observations. The solid solution strengthening contribution increases with decreasing temperature and increasing strain rate. The drag effect in the model proves to be significant only for deformation at high strain rate (~ 103 s−1).
Stefan Swanepoel, , Johan P. R. De Villiers
Published: 28 September 2022
Metallurgical and Materials Transactions B pp 1-20; https://doi.org/10.1007/s11663-022-02643-x

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Igor Vysotskiy, Sergey Malopheyev, Ivan Zuiko, , Rustam Kaibyshev
Published: 27 September 2022
Metallurgical and Materials Transactions A pp 1-5; https://doi.org/10.1007/s11661-022-06829-5

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Jingfan Zhang, Lei Meng, Deliang Zhang, Wenpeng Gao, Gongjun Fang, Junjie Luo, Wen Chen
Published: 26 September 2022
Metallurgical and Materials Transactions A pp 1-13; https://doi.org/10.1007/s11661-022-06828-6

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Pengyu Wen, Zhengzong Chen, Lixia Yang, Zedong Xie, Danqi Huang, ,
Published: 26 September 2022
Metallurgical and Materials Transactions A pp 1-13; https://doi.org/10.1007/s11661-022-06823-x

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