Effect of Nb–V microalloying on low-cycle fatigue property of Fe–Mn–Al–C austenitic steel

Zhao, Ting; Chen, Chen; Wang, Yuefeng; Wang, Tiansheng; Sheng, Guoliang; He, Yanming

doi:10.1016/j.jmrt.2023.02.020

Cited by 7 publications

(1 citation statement)

References 41 publications

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“…Considering that the V element is a strong carbonitride-forming element, a certain content of V and N elements are usually added into high-strength steel to obtain precipitates containing V inside grains and at grain boundaries to realize precipitation strengthening and refinement strengthening, thereby improving the properties of steel such as strength, plasticity and toughness [19][20][21][22], and some investigations on the effects of precipitates containing V on the LCF property of steel have been carried out [23,24]. During welding, the dissolution, growth and precipitation of V carbonitride in the weld thermal cycle will affect the microstructural transformation of the WJ [25][26][27][28], thereby affecting the LCF property of the WJ.…”

Section: Introductionmentioning

confidence: 99%

Effects of V-N Microalloying on Low-Cycle Fatigue Property in the Welded Joints of Constructional Steel

Cui,

Yang,

et al. 2023

Materials

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Low-cycle fatigue testing was carried out for the welded joints of constructional steels containing 0% V + 0.0021% N and 0.10% V + 0.0078% N, and the effects of V-N microalloying on the low-cycle fatigue property of the welded joints were investigated. The results showed that when the total strain amplitudes were 1.2%, 1.4% and 1.6%, the mean low-cycle fatigue lives of the welded joints of steel containing 0.10% V + 0.0078% N were 5050, 2372 and 1535 cycles, respectively, which were significantly higher than those of the welded joints of steel containing 0% V + 0.0021% N; however, when the total strain amplitudes increased to 1.8% and 2.0%, the mean low-cycle fatigue lives of the welded joints of steel containing 0.10% V + 0.0078% N were 575 and 367 cycles, respectively, which were gradually lower than those of the welded joints of steel containing 0% V + 0.0021% N. The reasons causing the difference of low-cycle fatigue life were explained by the dislocation structure and precipitates in the welding heat-affected zone, plastic strain energy density of the welded joints, and fatigue fracture morphology. When the low-cycle fatigue life is between 100 and 200 cycles, the cyclic toughness of the welded joint of steel containing 0.10% V + 0.0078% N is between 57.48 and 78.22 J/cm3, which is higher than that of the welded joint of steel containing 0% V + 0.0021% N, indicating that the welded joint of steel containing 0.10% V + 0.0078% N is able to absorb more energy in a seismic condition, therefore possessing better seismic resistance.

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