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Abstract
The effect of post-weld heat treatment (PWHT) on the mechanical properties and microstructure of carbon steel base metal was investigated. MDF A 105, 106-B, 216-WCB, 516-415, and 516-485 carbon steels were employed, and the steels were each subjected to heat treatment with holding temperatures of 610, 650, 690, and 730 ℃ for 8 hours for the simulation of PWHT. The tensile strength and impact toughness of the steels showed a tendency to decrease with increasing holding temperature; this behavior was mainly attributed to the spheroidization of cementite in pearlite and the precipitation of cementite at grain boundaries.
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