High Temperature Mechanical Property and Microstructure Study of Micro-Alloyed Q345B Structural Steel

Fang Dong; Cheng Su

doi:10.4028/www.scientific.net/AMR.399-401.223

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 399-401High Temperature Mechanical Property and...

High Temperature Mechanical Property and Microstructure Study of Micro-Alloyed Q345B Structural Steel

Abstract:

The V、Ti、Nb micro-alloyed Q345B structural steel was made the hot tensile test by Gleeble-1500D thermal simulation testing machine. It analyses the change of fracture strength and reduction of area with temperature at the deformation condition of strain rate 1.5*10^-3/S and deformation temperature 700-1300°C(△T=100°C) were analyzed. The Q345B structural steel exists two obvious brittle zones, the first temperature area of brittle(Ⅰ) is solidification temperature~1300°C,the second temperature area of brittle(Ⅲ) is 850~740°C. Through observation of fracture morphology and microstructure by using of scanning electron microscopy and optical microscopy, and the fracture reasons were discussed.

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Periodical:

Advanced Materials Research (Volumes 399-401)

Pages:

223-227

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.399-401.223

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Online since:

November 2011

Authors:

Fang Dong, Cheng Su

Keywords:

Fracture Morphology, High Temperature Mechanical Properties, Microalloyed Steel

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