Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 24, Issue 4, Pages 1626-1633Publisher
SPRINGER
DOI: 10.1007/s11665-015-1423-3
Keywords
linepipe; mechanical properties; microstructure; post-weld heat treatment; X52 steel
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In the present paper, influences of normalization heat treatment on microstructural and mechanical properties of high-frequency induction welded (HFIW) joints of X52 steel have been investigated. HFIW joints were post-weld heat treated at different times and temperatures. The microstructure and mechanical properties of the heat treated joints were then comprehensively investigated. Based on the results, a proper normalization of the primary fine grain steel caused the grain size to increase; but because of converting brittle microstructure into ductile microstructure, it caused the toughness to increase also. In addition, the ductility of the joints was enhanced. Nevertheless, tensile strength, yield strength, and hardness were reduced. The results showed that 950 A degrees C was the optimum normalization temperature from the standpoint of fracture toughness for the X52 steel joints. At 1050 A degrees C, the carbides and/or nitrides in the steel dissolved, and excessive grain growth occurred. Hence, the maximum allowable temperature for normalization was found to be 1000 A degrees C.
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