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Li L.,The State Key Laboratory of Refractories and Metallurgy | Li L.,Wuhan University of Science and Technology | Liu S.,The State Key Laboratory of Refractories and Metallurgy | Liu S.,Wuhan University of Science and Technology | And 4 more authors.
Metals and Materials International | Year: 2016

A constitutive model including the kinetics of twinning and martensitic transformation has been established based on the dislocation theory and the mixture law. The stress-strain curve of a 304 stainless steel has been measured by a tensile test. The material constants for the constitutive model are then found through an inverse analysis of the stress-strain curve measured experimentally, determining the stress-strain relationship equation and the kinetics of twinning and martensitic transformation of the investigated alloy. The volume fractions of martensitic transformation have been measured by the magnetic tester of Fischer Model MP3C. It has been shown that the calculated stress-strain curve and the volume fractions of martensitic transformation are in agreement with those obtained from experimental measurements, demonstrating that the material constants found by using the stress-strain curve can capture the underlying materials science of deformation. On this basis, the influence of twins, martensitic transformation, and mechanical behavior of austenite and martensite on the strength and plasticity of the 304 stainless steel has been discussed further. © 2016 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht Source


Zhu C.-Y.,The State Key Laboratory of Refractories and Metallurgy | Zhu C.-Y.,Wuhan University of Science and Technology | Chen X.-H.,The State Key Laboratory of Refractories and Metallurgy | Chen X.-H.,Wuhan University of Science and Technology | And 4 more authors.
Materials Science Forum | Year: 2016

Effects of RE addition on deoxidation and desulphurization efficiency, precipitation behaviors of the inclusions, microstructure and magnetic properties of the finished sheets have been investigated for no-oriented electrical steel produced in industrial scale. The most suitable addition amount of RE alloy added in the electrical steel bearing is proposed for excellent deoxidation and desulphurization efficiency. RE added into the steel can form larger and higher melt point RE oxides, RE sulfides and RE oxysulfides inclusions removing from the bath by floating which decreases the numbers and increases the size of the fine inclusions. The average size of the inclusions remained in the steel is 0.8μm~1.4μm. RE content affects grain size by influencing number and size of fine inclusions in the finished steel sheets. The magnetic flux density of the finished steel sheets dereases with the increase of RE content while the lowest core loss of it has an optimum RE content in the steel. In the steel bearing 1.15wt% Si, the content of RE should be strictly controlled in the range from 20×10-4 wt% to 60×10-4 wt%. © 2016 Trans Tech Publications, Switzerland. Source


Zhu C.,The State Key Laboratory of Refractories and Metallurgy | Zhu C.,Wuhan University of Science and Technology | Chen X.,The State Key Laboratory of Refractories and Metallurgy | Chen X.,Wuhan University of Science and Technology | And 6 more authors.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2015

The precipitation behaviors of the second phase particles and their textures in the low temperature grain-oriented silicon steel are studied under different processes. The results show that not only the dispersed nanoscale spherical or ellipsoidal MnS and Cu2S precipitations are observed in the hot rolled slabs, but also SiO2, AlN and Si3N4 which are similar to MnS and Cu2S in the morphology and complex compounds that are composed by them together are observed. In the sample, precipitations at the micron scale are mainly composed by SiO2, MnS, Cu2S and AlN, and precipitations at the nanoscale are mainly composed by AlN, Si3N4, MnS and Cu2S. The number of precipitates whose size is from 0.01 μm to 0.2 μm is the largest in the hot rolled slabs, which accounts for about 90%. Compared with the conventional hot rolling slabs, the area density of the inclusions in the CSP samples is smaller, but the average size in the range of greater than 1 μm of that is larger. It will make the secondary recrystallization incomplete during the annealing process, and also it can influence the magnetic property of the products. The distribution of texture which is perpendicular to the rolling direction on cross section in the hot rolled slabs is very different. The texture of the CSP samples is relatively uniform, which is harmful to develop complete secondary recrystallization texture during the subsequent treatment process to obtain good magnetic properties. ©, 2015, Chongqing Medical University. All right reserved. Source

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