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Plastically deformed metals

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  • Metals are used as biomaterials due to their excellent electrical and thermal conductivity and mechanical properties. Since some electrons are independent in metals, they can quickly transfer an electric charge and thermal energy. The mobile free electrons act as the binding force to hold the positive metal ions together. This attraction is strong, as evidenced by the closely packed atomic arrangement resulting in high specific gravity and high melting points of most metals.

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  • This chapter provides classification of metal forming processes based on types of forces applied onto metals. • Mechanics of metal forming will be outlined to understand stress criterion for plastic deformation. • Differences between hot and cold working will be highlighted and advantages-disadvantages of hot and cold working will be given. • Effects of deformation speed and friction on metal working process will be included.

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  • We are a group of dedicated material scientists each with 15–25 years of research and development experience in the assembly and interconnect technologies of electronics. Our experience in chemical and mechanical interfacial compatibility between dissimilar materials dates back to the end of the 1980s. Since the early 1990s with the rise of the electronics industry in Finland, we focused our work increasingly into the challenges of materials, assembly technologies and reliability of portable electronics.

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  • In this paper, the Dung’s microscopic damage model which depicts void growth under plastic deformation is applied to predict ductile fractures in high strength steel API X65. The model is implemented as a vectorized userdefined material subroutine (VUMAT) in the ABAQUS/Explicit commercial finite element code.

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  • In order to predict hardening stresses quantitatively, it is necessary to consider interactions among various factors. As shown in Fig. 23, these include: (1) phase transformations, (2) latent heat, (3) thermal stress, (4) transformation stress and plasticity, (5) heat generation due to deformation, and (6) mechanically induced transformation.

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  • This chapter provides fundamental of metal working process for forging in order to understand mathematical approaches used in the calculation of applied forging loads required to cause plastic deformation to give the final product. • Classification of metal forging methods is also provided with descriptions of defects observed from the forging processes. • The solutions to tackle such defects will also be addressed.

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  • Process and Control Objectives Forming of metallic materials is the process of choice when complex net shapes with high levels of productivity are desired. Myriad processes, ranging from job-shop metal bending machines to very high speed stamping and forging presses are available. In all cases, the processes involve plastic deformation of the workpiece, and the resulting strong

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  • Trong giai đoạn biến dạng dẻo của kim loại, làm việc cứng luôn luôn đi cùng với mềm. Sự tăng trưởng mầm, khoảng trống nhỏ bên trong hoặc sâu răng theo nhựa tăng là cơ chế vi làm mềm.

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