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11095 Effect of Titanium Content on Hydrogen Induced Cracking of High Strength Low Alloy Welds in the H2S Containing Environment

Picture for 11095 Effect of Titanium Content on Hydrogen Induced Cracking of High Strength Low Alloy Welds
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Product Number: 51300-11095-SG
ISBN: 11095 2011 CP
Author: Afshin Zandipour, Alireza Khoshakhlagh, and Afshin Erfanfar
Publication Date: 2011
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The microstructure and hydrogen induced cracking of SAW welds in API 5L X70 grades with different amount of titanium were studied. The investigation was carried out on the base metal, heat affected zone and weld metal with three different titanium amounts in weld metal containing 1.4%Mn and 1.9%Mn respectively. The results showed that the centerline segregation region of the base metal was sensitive to hydrogen induced cracking while the heat affected zone did not show any failure. Furthermore, were observed that with addition of titanium, the formation of acicular ferrite in the microstructure and hardness values were increased and stress oriented hydrogen induced cracks appeared in the weld metal. The optimum combination of the microstructure and hydrogen induced cracking resistance was observed in 1.4%Mn-0.11%Ti and 1.9%Mn-0.05 Ti% respectively.

Keywords: Microstructure, Hydrogen Induced Cracking, Titanium, Acicular ferrite
The microstructure and hydrogen induced cracking of SAW welds in API 5L X70 grades with different amount of titanium were studied. The investigation was carried out on the base metal, heat affected zone and weld metal with three different titanium amounts in weld metal containing 1.4%Mn and 1.9%Mn respectively. The results showed that the centerline segregation region of the base metal was sensitive to hydrogen induced cracking while the heat affected zone did not show any failure. Furthermore, were observed that with addition of titanium, the formation of acicular ferrite in the microstructure and hardness values were increased and stress oriented hydrogen induced cracks appeared in the weld metal. The optimum combination of the microstructure and hydrogen induced cracking resistance was observed in 1.4%Mn-0.11%Ti and 1.9%Mn-0.05 Ti% respectively.

Keywords: Microstructure, Hydrogen Induced Cracking, Titanium, Acicular ferrite
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