Effect of Second Phase on the Deformation and Fracture Behavior of Multiphase Low-Density Steels

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• 作者：Seong-Jun Park ; Yoon-Uk Heo ; Yong Hoon Choi ; Keunho Lee ; Heung Nam Han ; Dong-Woo Suh
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：66
• 期：9
• 页码：1837-1844
• 全文大小：4,599 KB
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• 作者单位：Seong-Jun Park (1)
  Yoon-Uk Heo (2)
  Yong Hoon Choi (2)
  Keunho Lee (3)
  Heung Nam Han (3)
  Dong-Woo Suh (2)
  
  1. Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, Korea
  2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, Korea
  3. Department of Materials Science and Engineering, Seoul National University, Seoul, Korea
  
• ISSN：1543-1851

文摘

The effects of the second-phase characteristics on the deformation and fracture behavior in low-density steel are investigated in Fe-0.2C-(4, 8)Mn-5Al-1Si alloys, where the second phase can be retained austenite or a mixture of κ-carbide and ferrite depending on the processing condition. With austenite as second phase, the mechanical stability of the austenite is critical regarding ductility because the fracture is likely to occur before the onset of necking when the austenite transforms into martensite in the early stage of deformation. In the case of the mixture of ferrite and κ-carbide, the round shape of κ-carbide is more favorable than the dense lamellar structure. The prominent influence of the second phase on the deformation and fracture behavior is attributable to the propensity of matrix ferrite for cleavage fracture due to its large aluminum concentration.