Effect of Nb Content on the Impact Toughness of Coarse-Grained Heat-Affected Zone of Pipeline Steels under Large Heat Input

Feng Zhou; Zhou Gao; Kai Ming Wu

doi:10.4028/www.scientific.net/AMR.1078.3

Paper Titles

Effect of Nb Content on the Impact Toughness of Coarse-Grained Heat-Affected Zone of Pipeline Steels under Large Heat Input
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Occurrence and Control of Crack on Counterweight of Forklift Cast with High Manganese Pig Iron
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Controllable Preparation of Zinc Phosphate Materials with Different Morphologies and Particle Size
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Analysis of Plastic Zone at a Crack Tip for I, II and III Mode Fracture with MY Criterion
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Characterization of Zirconia Sizing Nozzle Modifying Addictives Preparated by Sol-Gel Method
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Study on the Hydrolysis of PET Catalyzed by Carbonates under Microwave Irradiation
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The Facile Preparation and the Performance of Killing Oncomelania Snails of Zinc Oxide Nanoparticles
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1078Effect of Nb Content on the Impact Toughness of...

Effect of Nb Content on the Impact Toughness of Coarse-Grained Heat-Affected Zone of Pipeline Steels under Large Heat Input

Abstract:

The effect of large heat inputs (200 kJ/cm) on the microstructures and toughness of heat-affected zone of Nb microalloyed X70 pipeline steels were simulated utilizing Gleeble-3800. The microstructures were observed by optical microscope, scanning electron microscope and electron backscattered diffraction technique. Results showed that when the large heat input welding was applied, big austenite grains and coarse microstructures were formed in the coarse-grained heat-affected zone, and thus the toughness of the coarse-grained heat-affected zone was seriously reduced. With the increase of Nb content, the toughness of the CGHAZ did not change remarkably under the large heat input welding.

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Periodical:

Advanced Materials Research (Volume 1078)

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3-7

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1078.3

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Online since:

December 2014

Authors:

Feng Zhou, Zhou Gao, Kai Ming Wu

Keywords:

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

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