Adiabatic shear banding and cracking phenomena occurring during cold-forging simulation tests of plain carbon steel wire rods by using a split Hopkinson’s pressure bar

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• 作者：Minju Kang ; Jaeyeong Park ; Seok Su Sohn ; Hyunmin Kim…
• 关键词：forging ; adiabatic shear banding ; strain rate ; split Hopkinson’s pressure bar ; impact test
• 刊名：Metals and Materials International
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：21
• 期：6
• 页码：991-999
• 全文大小：1,044 KB
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• 作者单位：Minju Kang (1)
  Jaeyeong Park (1)
  Seok Su Sohn (1)
  Hyunmin Kim (2)
  Kwan-Ho Kim (3)
  Sunghak Lee (1)
  
  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea
  2. School of Engineering, Brown University, Providence, RI, 02912, USA
  3. Technical Research Laboratories, POSCO, 1 Goedong-dong Nam-gu, Pohang, Gyeongbuk, 790-785, Korea
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials
  Operating Procedures and Materials Treatment
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2005-4149

文摘

Adiabatic shear banding and cracking phenomena occurring during cold forging of plain carbon steel wire rods, whose carbon content was varied from 0.2 to 0.8 wt%, were analyzed by forging simulation test using a split Hopkinson’s pressure bar. The test results indicated that the 0.2C and 0.3C steels were dynamically compressed without surface defects after the fifth hit, whereas a deep crack was formed along the 45° direction in the 0.8C steel. In all the steels, adiabatic shear bands were formed diagonally inside forging-simulated specimens, and grains were extremely elongated within shear bands. The higher the volume fraction of pearlite was, the easier was the adiabatic shear banding. Particularly in the 0.8C steel, the shear band was white-colored and narrow, along which a long crack was formed. After the spheroidization treatment of the 0.8C steel, adiabatic shear bands or cracks were not found during the forging simulation test as the steel was relatively homogeneously deformed, which indicated that the spheroidization effectively prevented the adiabatic shear banding or cracking. The present forging simulation test plausibly evaluated the cold-forging performance by controlling the number and amount of hit, and provided an important idea on whether the spheroidization was needed or not. Keywords forging adiabatic shear banding strain rate split Hopkinson’s pressure bar impact test