Improving the plasticity of thin cold-rolled steel sheet for cold stamping

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• 作者：I. V. Doshchechkina ; S. S. D’yachenko ; I. V. Ponomarenko…
• 关键词：cold ; rolled steel ; thin sheet ; stamping ; technological plasticity ; extensibility ; Erichsen tests ; stampability ; ion bombardment ; epilam coating ; nanocrystalline structure ; submicrocrystalline structure
• 刊名：Steel in Translation
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：46
• 期：5
• 页码：364-367
• 全文大小：351 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Russian Library of Science
  
• 出版者：Allerton Press, Inc. distributed exclusively by Springer Science+Business Media LLC
• ISSN：1935-0988
• 卷排序：46

文摘

Two methods of surface treatment are proposed to improve the technological plasticity of thin cold-rolled carbon-steel sheet: ionic bombardment by low-energy titanium atoms; and epilam coating. Both methods markedly increase the extensibility of the sheet (by a factor of 1.2–1.3), as estimated by the maximum crater depth without cracking in Erichsen tests (from the VG group to values exceeding those for the VOSV group, which corresponds to extremely complex extension, in State Standard GOST 9045–93). This is associated with change in the behavior of the sheet on deformation (with change in the properties of the material) as a result of two processes: the healing of surface defects; and the creation of hybrid nanocrystalline and submicrocrystalline structure in the surface layer. In epilam coating, only the first process occurs; in ionic bombardment, both are observed.