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LIU Chang, DENG Caiyan, WANG Sheng, GONG Baoming. Critical fracture toughness of weld metal structure in submerged arc welding of EH36 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(3): 107-110. DOI: 10.12073/j.hjxb.2019400081
Citation: LIU Chang, DENG Caiyan, WANG Sheng, GONG Baoming. Critical fracture toughness of weld metal structure in submerged arc welding of EH36 steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(3): 107-110. DOI: 10.12073/j.hjxb.2019400081
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Critical fracture toughness of weld metal structure in submerged arc welding of EH36 steel

  • 1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;

  • 2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China;

  • 3. Chiwan Sembawang Engineering Co., Ltd., Shenzhen 518068, China

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  • Received Date: December 21, 2017
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    • Abstract
  • SENT (Single Notched Tensile) specimen was used to study the critical fracture toughness of acicular ferrite (AF) and proeutectoid ferrite (PF) in the EH36 submerged arc welding weld metal. The results showed that the fracture toughness of AF is higher than that of PF. The main reason is that the AF has a high density of dislocation, crack blunting occurs due to plastic deformation under loading. In contrast, PF, whose dislocation density is small, is relatively pure and uniform. The heterogeneity of microstructures lead to a great dispersion of the fracture toughness of the weld metal, which is mainly due to the different fracture toughness and heterogeneous distribution of microstructures in crack tip.
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    • References (11)
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