Microstructure characterization and thermal behavior around crack tip under electropulsing

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• 作者：Shaopeng Wei ; Gang Wang ; Dewei Deng ; Yiming Rong
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：121
• 期：1
• 页码：69-76
• 全文大小：2,638 KB
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• 作者单位：Shaopeng Wei (1)
  Gang Wang (1)
  Dewei Deng (2)
  Yiming Rong (1) (3)
  
  1. Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control, Tsinghua University, Beijing, 100084, China
  2. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116023, China
  3. Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, 01609, USA
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630

文摘

Electropulsing treatment is a practical method to arrest crack propagation. The microstructure characterization and research on the forming mechanism are difficult due to the small affected area (0.01- mm2), high-temperature gradient (102 K/mm) and change rate (104-07 K/s). In this paper, the 1045 steel plate with a preexisting crack subjected to high-voltage pulses was investigated. The surface morphologies and microstructure around the crack tip were observed using optical microscopy and scanning electron microscopy. Experimental results showed that the material around the tip melted, splashed and blunted under electropulsing treatment. The microstructure around the molten hole was divided into four distinct regions. An electro-thermal coupled model considering material ejection, cavity formation, current oscillation and temperature-dependent material properties was proposed to investigate the dynamic formation process of molten hole and gradient microstructure. The uneven temperature distribution, high cooling rate and insufficient carbon diffusion led to the formation of gradient microstructure.