Effect of Heat Input on Impact Toughness of Coarse-Grained Heat-Affected Zone of a Nb-Ti Microalloyed Pipeline Steel

Zhou Gao; Ran Wei; Kai Ming Wu

doi:10.4028/www.scientific.net/AMR.538-541.2026

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 538-541Effect of Heat Input on Impact Toughness of...

Effect of Heat Input on Impact Toughness of Coarse-Grained Heat-Affected Zone of a Nb-Ti Microalloyed Pipeline Steel

Abstract:

The effect of varying heat inputs (20, 100, 200 kJ/cm) on the microstructures and toughness of the simulated coarse-grained heat-affected zone of a Nb-Ti microalloyed pipeline steel were investigated utilizing optical and electron microscope. Results showed that the impact toughness of the coarse-grained heat-affected zone maintained a higher level at the heat input of 20 and 100 kJ/cm, whereas it dropped to a much lower level at the heat input of 200 kJ/cm. The good toughness was attributed to the grain refinement and the homogenous distribution of fine and elongated martensite/austenite constituents. The deterioration of toughness for high heat input simulated welding was mainly caused by the coarse bainitic microstructure and massive martensite/austenite constituents.

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Periodical:

Advanced Materials Research (Volumes 538-541)

Pages:

2026-2031

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.538-541.2026

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Online since:

June 2012

Authors:

Zhou Gao, Ran Wei, Kai Ming Wu

Keywords:

Coarse-Grained Heat-Affected Zone, Impact Toughness, Large Heat Input Welding, Martensite-Austenite Constituent

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