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203 results on '"McLean, Alexander"'

7. Recovery of Copper from Copper Smelting Slag Using a Green Reductant

Author

Qu, Guorui, Wei, Yonggang, Li, Bo, Wang, Hua, Yang, Yindong, McLean, Alexander, Peng, Zhiwei, editor, Hwang, Jiann-Yang, editor, Downey, Jerome P., editor, Gregurek, Dean, editor, Zhao, Baojun, editor, Yücel, Onuralp, editor, Keskinkilic, Ender, editor, Jiang, Tao, editor, White, Jesse F., editor, and Mahmoud, Morsi Mohamed, editor

Published
2020
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32. Dynamic Recrystallization Kinetics of As-Cast Fe-Cr-Al-La Stainless Steel during Hot Deformation.

Author

Deng, Zhenqiang, Liu, Jianhua, Shao, Jian, and McLean, Alexander

Subjects
RECRYSTALLIZATION (Metallurgy), STAINLESS steel, STRAINS & stresses (Mechanics), STRESS-strain curves, STRAIN rate, STRAIN hardening
Abstract

To investigate the dynamic recrystallization (DRX) behavior of as-cast Fe-20Cr-5.5Al-0.64La stainless steel, a series of compression tests were carried out on a Gleeble-3500 thermal simulator in the temperature range of 1000~1150 °C and the strain rate range of 0.001~1 s−1. The true stress-true strain curves were obtained and their characteristics were analyzed. Using regression analysis, the apparent activation energy for the Fe-20Cr-5.5Al-0.64La stainless steel was estimated to be 300.19 kJ/mol, and the constitutive equation was developed successfully with a hyperbolic sine equation as: ε ˙ = e 21.91 sinh 0.035 σ 3.18 exp − 300190 R T . The critical strain, the peak strain and the strain for the maximum softening rate were identified based on the work hardening rate curves and expressed as a function of the Zener−Hollomon parameter. The kinetic model of DRX was established using the stress−strain data. According to the analysis of the kinetics model and microstructure evolution, the evolution of DRX volume could be described as follows: the volume fraction of DRX grains increased with an increase in strain; at a fixed deformation temperature, the DRX volume fraction was larger at a lower strain rate for the same strain; and the size of DRX grains increased with an increase in temperature or a decrease in strain rate. [ABSTRACT FROM AUTHOR]

Published
2023
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43. Early results after laparoscopic Roux-en-Y gastric bypass: effect of the learning curve

Author

Andrew, Christopher G., Hanna, Wael, Look, Didier, McLean, Alexander P.H., and Christou, Nicolas V.

Subjects
Gastric bypass -- Analysis
Abstract

Introduction: This study was performed to evaluate the safety and short-term efficacy of laparoscopic Roux-en-Y gastric bypass (LRYGB) for morbid obesity and to describe the relation between learning curve and [...]

Published
2006

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