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LI Yajiang, XIA Chunzhi, U A PUCHKOV, WANG Juan. Weldability of super-Ni/NiCr laminated composite and 18-8 stainless steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (2): 13-16.
Citation: LI Yajiang, XIA Chunzhi, U A PUCHKOV, WANG Juan. Weldability of super-Ni/NiCr laminated composite and 18-8 stainless steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (2): 13-16.
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Weldability of super-Ni/NiCr laminated composite and 18-8 stainless steel

  • 1.

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China;Materials Science Department, Bauman Moscow State Technical University, Moscow 105005, Russia

  • 2.

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China

  • 3.

    Materials Science Department, Bauman Moscow State Technical University, Moscow 105005, Russia

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  • Received Date: August 29, 2009
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    • Abstract
  • Super-Ni laminated composite and 18-8 stainless steel were welded together by tungsten inert gas arc welding with filler metal. Microstructure, microhardness and phase constitution near the fusion was analyzed by means of micro-image analyzer, electron probe micro-analyzer and X-ray diffraction. Experimental results indicated that the columnar austenite grains at the weld edge grew with directionality, which were perpendicular to the fusion zone. A reliable fusion zone was formed between the NiCr base layer and the welded metal. Microhardness near the super-Ni cover layer increased, while the microhardness of welded metal near the 18-8 steel was lower than that of the 18-8 base metal. The welded metal mainly consisted of austenite, a little δ ferrite, γ-Ni (Cr, Fe) and FeNi. The tungsten arc in the welding should be controlled towards the 18-8 steel side to avoid the excessive molten lose of super-Ni cover layer.
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