Comparison of crack-arrest fracture toughness between low and high heat-input thick weld specimens

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• 作者：Gyu Baek An ; Wanchuck Woo ; Jeong Ung Park…
• 关键词：Brittle fracture ; Crack arrest ; Fracture toughness ; Thick steel ; Welds
• 刊名：International Journal of Fracture
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：194
• 期：2
• 页码：197-203
• 全文大小：1,674 KB
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• 作者单位：Gyu Baek An (1)
  Wanchuck Woo (2)
  Jeong Ung Park (3)
  Vyacheslav Em (4)
  
  1. Technical Research Laboratories, POSCO, Pohang, 790-300, South Korea
  2. Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon, 305-353, South Korea
  3. Department of civil Engineering, Chosun University, Gwangu, 501-759, South Korea
  4. Neutron Research Department, NRC Kurchatov Institute, 1, Akademika Kurchatova pl., Moscow, Russia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Mechanics
  Civil Engineering
  Automotive and Aerospace Engineering and Traffic
  Mechanical Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-2673

文摘

Brittle crack-arrest fracture toughness \((\hbox {K}_{\mathrm{Ia}})\) was determined in low (1.5 kJ/mm) and high (53 kJ/mm) heat-input weld specimens with a large scale (\(1\times 1\) m) and thickness (50 and 80 mm). An instant impact having energy of 2.7 kJ was imposed into the full-thickness notch tip at low temperature and initiates crack propagation toward a higher temperature region where the crack stopped due to the improved fracture toughness. The relationship between the toughness and crack-arrest temperature provides the \(\hbox {K}_{\mathrm{Ia}}\) at \({-}10\,^{\circ }\hbox {C}\) of about 2700 and \(2200\,\hbox {N/mm}^{3/2}\) in the low and high heat-input weld specimens, respectively. This discrepancy was correlated to the grain size and Charpy impact energy of the notch region caused by the amounts of heat inputs in each weld specimen. Keywords Brittle fracture Crack arrest Fracture toughness Thick steel Welds