›› 2012, Vol. ›› Issue (03): 639-644.

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Test on the fracture toughness of high-strength steel Q460C at low temperature

WANG Yuan-qing1, LIN Yun2, ZHANG Yan-nian2, SHI Yong-jiu1   

  1. 1. Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Tsinghua University, Beijing 100084, China;
    2. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
  • Received:2011-04-03 Online:2012-05-01

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Abstract: The fracture toughness characteristic of the high-strength steel at low temperature was studied. The crack tip opening displacement δm of construction steel Q460C with thickness 14 mm was tested at low temperature, and its fracture appearance was analyzed microscopically by an electronic microscope. It was found that at temperature -40 ℃, the fracture of the 3-point bending specimen of steel Q460C shows an obvious brittle fracture mechanism. The δm value of steel Q460C tends to decrease with the temperature reduction, which is less than those of steels Q235, Q345 and Q390, so the steel Q460C is characterized by the poorest fracture toughness among them. A Boltzmann function fitting analysis was performed to the test data, and the ductile-brittle transition temperature and its Changing behavior were obtained. The results showed an obvious cold brittle characteristic of the high-strength construction steel Q460C.

Key words: metallic material, crack tip opening displacement, test at low temperature, ductile-brittle transition temperature

CLC Number: 

  • TU391
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