Low temperature impact toughness of high strength structural steel

Lewei Tong, Lichao Niu, Shuang Jing, Liwen Ai, Xiao Ling Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

59 Citations (Scopus)


Impact toughness properties of four kinds of high strength steel (HSS) were investigated with the nominal yield strength 460, 690, 800 and 960 MPa, respectively. The specialty of impact toughness among base metal, heat affected zone (HAZ) and weld metal were also compared and discussed. The correlations between the impact toughness of HSS and their nominal yield strength, plate thicknesses, testing temperature, welding methods were further studied. Combined with the scanning electron microscope (SEM) fracture surface observation, the microstructural features and corresponding fracture mechanisms have been analyzed. The results show that the impact toughness for HSS base metal deteriorated with the increasing nominal yield strength. The impact toughness of weld metal for HSS is much lower than that of the corresponding base metal. The impact performance of HAZ is discretized due to the welding thermal cycling on the HAZ where significant changes in grain structure and properties occur. The microcosmic fracture surface of HSS is examined to explain the reduction in impact performance under low temperature.

Original languageEnglish
Pages (from-to)410-420
Number of pages11
JournalThin-Walled Structures
Publication statusPublished - Nov 2018
Externally publishedYes


  • Base metal
  • Ductile-brittle transition temperature (DBTT)
  • Heat affected zone (HAZ)
  • High strength steel
  • Impact toughness
  • Low temperature
  • Weld metal

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering


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