Analysis of Microstructural Changes in the Heat-Affected Zone and Fusion Zone of a Fiber Laser Welded DP980 Steel

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• 作者：Jianqi Zhang ; Abdul Khan ; Olanrewaju A. Ojo…
• 刊名：Metallurgical and Materials Transactions B
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：46
• 期：4
• 页码：1638-1646
• 全文大小：2,763 KB
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• 作者单位：Jianqi Zhang (1)
  Abdul Khan (1)
  Olanrewaju A. Ojo (1)
  Norman Zhou (2)
  Daolun Chen (3)
  
  1. Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
  2. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada
  3. Department of Mechanical and Aerospace Engineering, University of Ryerson, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Manufacturing, Machines and Tools
  Metallic Materials
  Operating Procedures and Materials Treatment
  Characterization and Evaluation Materials
  Numerical and Computational Methods in Engineering
  
• 出版者：Springer Boston
• ISSN：1543-1916

文摘

Dual phase (DP) steels are designed to consist of hard martensite dispersed in a relatively soft ferrite matrix, which offers a favorable combination of high strength with good deformability. Fiber laser welding (FLW) is becoming increasingly important for joining advanced materials due to its flexibility and deep penetration. In this study, the microstructure of a DP steel, DP980, welded by FLW technique was carefully analyzed. Gleeble thermo-mechanical simulation coupled with analytical transmission electron microscopy revealed that the FLW process produced significant microstructural changes in a narrow heat-affected zone (HAZ) and fusion zone (FZ), which can result in dramatic changes in mechanical properties. This is reflected in the micro-hardness profile obtained across the welded material. The salient phase transitions induced by the FLW, including the formation of new martensite grains in the upper-critical HAZ and FZ, are discussed.