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Menggenbagen, MA Chengyong, PENG Yun, TIAN Zhiling, LIN Wenguang. Effect of heat input on microstructure and low temperature impact resistance of welded joint of 9Ni steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (6): 69-72.
Citation: Menggenbagen, MA Chengyong, PENG Yun, TIAN Zhiling, LIN Wenguang. Effect of heat input on microstructure and low temperature impact resistance of welded joint of 9Ni steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (6): 69-72.
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Effect of heat input on microstructure and low temperature impact resistance of welded joint of 9Ni steel

  • 1.

    College of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot 010051, China;Central Iron & Steel Research Institute, Beijing 100081, China

  • 2.

    Central Iron & Steel Research Institute, Beijing 100081, China

  • 3.

    College of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot 010051, China

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  • Received Date: January 11, 2009
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    • Abstract
  • 9Ni steel was welded with submerged arc welding process,and the microstructure and fracture appearance of welded joints were analyzed. The effect of heat input on the microstructure and low temperature impact resistance of the joints was studied. The results show that with the increase of the heat input,dendritic segregation and precipitation phase in the weld reduce,and fracture dimples become larger and deeper,which make the impact resistance of the joints increase. The joints in different input can meet application requirements,which impact absorbing energy is superior to standard at -196℃ and hardness is inferior to 400 HV. The experiment results can be used as theoretic basis for making welding procedure of 9Ni steel.
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