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HONG Bo, ZHANG Minghua, YIN Fucheng. Analysis of mechanical properties and microstructure of flux-cored wire for railway transportation equipment steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 67-71. DOI: 10.12073/j.hjxb.20170416
Citation: HONG Bo, ZHANG Minghua, YIN Fucheng. Analysis of mechanical properties and microstructure of flux-cored wire for railway transportation equipment steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 67-71. DOI: 10.12073/j.hjxb.20170416
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Analysis of mechanical properties and microstructure of flux-cored wire for railway transportation equipment steel

  • 1.

    School of Mechnical Engineering, Xiangtan University, Xiangtan 411105, China;Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan 411105, China

  • 2.

    School of Material Science and Engineering, Xiangtan University, Xiangtan, 411105, China

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  • Received Date: December 18, 2016
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    • Abstract
  • Aiming at 450 MPa level low-alloy high-strength steel for railway transportation equipment, a flux-cored wire with excellent welding performance, high strength toughness and good fatigue resistance was developed. The tensile property, low-temperature impact toughness, fatigue strength and microstructure of flux-cored wire deposited metal were analyzed. The results indicate that the composition of flux-cored wire is designed reasonaby. The microstructures are mainly acicular ferrite and granular bainite.The grain size is fine. Therefore the strength toughness is effectively improved and the excellent low-temperature toughness and fatigue strength are obtained. The tensile strength, low-temperature impact toughness at-40 ℃ and fatigue strength of flux-cored wire deposited metal achieve 620 MPa,96 J and 354 MPa, which are 1.1,1.6 and 2.2 times of the target value of design respectively. The developed flux-cored wire can meet the welding requirement of 450 MPa level low-alloy high-strength steel for railway transportation equipment.
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