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Microstructure and mechanical properties of 22MnB5 Steel with different cooling method LIU Hongwei, YU Jingbo, ZHAO Hongyun, School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, China lhw@hitwh.edu.cn, hityjb328@163.com, hy_zhao66@163.com Keywords: 22MnB5, cooling method, tensile strengths, microstructure Abstract.
(a) Original material (b) Air cooling (c) Metal die cooling (d) Water cooling Fig.2 Fracture structure at different cooling method The fracture structure at different cooling method are compared with the original material which is showed in Fig.2, there are large ductile dimple at the fracture surface of original material which is the typical ductile fracture, The fracture surface showed shallow dimple and quasi-cleavage fracture which is showed in Fig.2 (c) and (d), which are the form of brittle fracture.
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Materials’ definition is an important part of numerical simulation, it will directly affect the accuracy and reliability of the results[6], and the stress-strain curve in tension and compression is a function of the materials properties.The stress-strain curve of shape memory alloy is shown in Figure 3.
Continued load, the material shows plastic deformation when stress is more than yield stress0 of materials and thus the materials’ stiffness significantly decreases.
Thus, materials of NiTi-shape memory alloy should satisfy the parameters of Equation (1) and Table 1 and by Abaqus software simulation calculations; patellar we assume is linearly elastic, elastic modulus E=12 000MPa, poisson ratio=0.3
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These nano-structured silicon materials show a remarkable enhancement on absorptance at near-infrared wavelength.
In these processes, silicon materials are doped with chalcogen, resulting in multiple impurity levels and finally broadening a new impurity band, which can break the limitation of optical band gap of silicon.
Then the comparison of morphologies, light absorptance, minority carrier lifetime with/without SiNx passivation have been investigated on two different nano-structured silicon materials.
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These two favored materials are expected to obtain by the electromagnetic directional solidification of hypereutectic Al-Si melts.
The effective output of these two favored materials depends on the high segregation efficiency of the hypereutectic Al-Si melts.
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Experimental materials Ethyl cellulose was purchased from Dongsheng chemical company, P.
The results showed that overall effect of the microcapsules is good, as utilization rate of the raw materials and preservation rate of the medicine are rather high.
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Introduction With the continuous development of science and technology, bi-material which possesses many functions that single material doesn’t possess, are widely used in production, all areas of life.
As there are many defects in the interface of combination of materials, the bond strength is rather lower.
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