Effect of Quenching Temperature on Microstructures and Mechanical Properties of Boron-Nickel-Added Nb-Treated HSLA H-Beams

Wang Xiao; Zuo Cheng Wang; Xie Bin Wang; Xian Da Li; Jun Qing Gao; Xiu Ling Zhao; Chang Xing Dong

doi:10.4028/www.scientific.net/AMR.194-196.165

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 194-196Effect of Quenching Temperature on Microstructures...

Effect of Quenching Temperature on Microstructures and Mechanical Properties of Boron-Nickel-Added Nb-Treated HSLA H-Beams

Abstract:

To lower the fracture appearance transition temperature (FATT) of Nb-treated HSLA H-beams further, boron-nickel-added Nb-treated HSLA H-beams were tempered after they were quenched at 870, 910 and 950°C respectively. Microstructures and mechanical properties, especially low temperature toughness of the experimental steels were investigated by scanning electron microscopy (SEM), uniaxial tensile test and Charpy impact test (V-notch). The results indicate that the FATTs of quenched & tempered specimens are all below -70С and that of some specimens is even below -90°С . Tensile strength of all quenched & tempered steels and their total elongation value are above 570 MPa and 21 % respectively. It can be seen that dual-phase microstructure of ferrite and tempered martensite in steels leads to the best low temperature toughness, and carbides along grain boundaries are beneficial to low temperature toughness.

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Periodical:

Advanced Materials Research (Volumes 194-196)

Pages:

165-168

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.194-196.165

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Online since:

February 2011

Authors:

Wang Xiao, Zuo Cheng Wang, Xie Bin Wang, Xian Da Li, Jun Qing Gao, Xiu Ling Zhao, Chang Xing Dong

Keywords:

Boron, H-Beam, High Strength Low Alloy (HSLA), Low Temperature Impact Toughness, Mechanical Property, Nickel, Quenching, Tempering

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