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WU Dong, LU Shanping, LI Dianzhong. Effect of welding thermal cycle on high temperature mechanical property of Ni-Fe base superalloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(9): 69-72.
Citation: WU Dong, LU Shanping, LI Dianzhong. Effect of welding thermal cycle on high temperature mechanical property of Ni-Fe base superalloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(9): 69-72.

Effect of welding thermal cycle on high temperature mechanical property of Ni-Fe base superalloy

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  • Received Date: March 18, 2014
  • The weldability of a Ni-Fe base superalloy, one of the candidate materials for high temperature components of 700℃ ultra-supercritical coal plant, was studied in this paper.Based on welding thermal simulator experiments, the variation and evolution of microstructure and mechanical properties were analyzed for this Ni-Fe base superalloy under welding thermal cycle treatment condition. The microstructure analysis showed thatγ phase and MC carbide in Ni-Fe base superalloy dissolved during high temperature welding thermal simulation process. The creep rupture time of welding thermal cycled sample was severely shorter than that of base solutioned sample at 700℃/400 MPa, and was similar to that of base solutioned sample at 700℃/350 MPa and 700℃/300 MPa, respectively. During creep test at 700℃, M23C6 gradually precipitated at the grain boundaries of HAZ, while γ precipitated in the HAZ matrix. The precipitated M23C6 and γ resulted in an improvement of 700℃ creep rupture property of HAZ. The precipitation of M23C6 at grain boundaries during creep test was mainly due to the supply of the carbon from MC which was dissolved partially during former welding thermal cycle.
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