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Acta Metall Sin  1997, Vol. 33 Issue (3): 297-303    DOI:
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HYDROGEN INDUCED FRACTURE IN WELD METAL OF FERRITE-AUSTENITE DUPLEX STAINLESS STEEL
XING Li; KE Liming (Nanchang Institute of Aero-Technology; Nanchang 330034)
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XING Li; KE Liming (Nanchang Institute of Aero-Technology; Nanchang 330034). HYDROGEN INDUCED FRACTURE IN WELD METAL OF FERRITE-AUSTENITE DUPLEX STAINLESS STEEL. Acta Metall Sin, 1997, 33(3): 297-303.

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Abstract  The fracture behaviour of weld metal of ferrite-austenite duplex stainless steel was investigated by constant deformation rate tensile test. It is shown that the origin of cracking relates with hydrogen and oxide inclusions in the weld metal. The propagation of cracks is a discontinuous process, the fracture appearance is different in each stage. The γ-phase resists the advance of cracks, and γ sheet within δ grains often forms tearing ridge, the γ-phase between δ grains often forms dimples. Transgranular cleavage fracture is more easily formed in the weld metal with higher hydrogen and nitrogen content.
Key words:  duplex stainless steel      weld metal      hydrogen induced fracture      crack propagation     
Received:  18 March 1997     
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