Characterization of Internal Voids and Cracks in Cold Heading of Dual Phase Steel

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概要

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• In this work, the mechanism of void and microcrack formation along the adiabatic shear bands (ASB) was studied for processing dual phase steel by cold heading. Experimental investigation along with finite element simulation has confirmed that this mechanism depends on two types of instabilities, namely geometrical and thermal instabilities. The geometric instability occurs in the presence of second phase particles (inclusions) and in relation to the material flow orientation, whilst the thermal softening arises due to the localized plastic deformation inside the ASB. Progressive deformation was observed to cause the elongation of voids in the direction of shearing that formed microcracks in the ASB of the cold headed specimen. In addition, transformed bands were observed in the highly deformed zones as a result of the temperature in the ASB exceeding the Ac3 transformation temperature 847°C. The superposition of the location of the ASB region containing the voids and micro-cracks with the phase transformation zone indicates that the development of optimized processing conditions is particularly critical for preventing fracture during cold heading of dual phase steels.

• 社団法人 日本鉄鋼協会の論文
• 2005-08-15

著者

• Sabih Amar

  Department Of Mechanical Engineering Mcgill Institute For Advanced Materials Mcgill University

• Wanjara Priti

  National Research Council-institute For Aerospace Research Aerospace Manufacturing Technology Center

• NEMES James

  Department of Mechanical Engineering, McGill Institute for Advanced Materials, McGill University

• Nemes James

  Department Of Mechanical Engineering Mcgill Institute For Advanced Materials Mcgill University

関連論文

• Characterization of Internal Voids and Cracks in Cold Heading of Dual Phase Steel
• Effect of Microstructure on Static and Dynamic Mechanical Property of a Dual Phase Steel Studied by Shear Punch Testing

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