Coupling effect of thermal aging and pre-strain on fracture behavior of SMAW welded joints

Wang, Chunhui; Fan, Mingzhi; Yu, Min; Wang, Yu; Liu, Zheng; Chen, Xu

doi:10.1016/j.engfracmech.2023.109224

Cited by 5 publications

(1 citation statement)

References 35 publications

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“…On the other hand, the microstructure evolutions, spinodal decomposition, and Gphase precipitation lead to the embrittlement of the ferrite phase after long thermal aging [8,[33][34][35]. Although the literature has proved that microhardness has a linear relation with the variations in ferrite decomposition after thermal aging in ER308L [21,36] and Z2CN18.12N2 [37,38], few reports are concerned with the effect of thermal aging on the microstructure of FZ in DMWJs. The complex ferrite and few inclusions or voids in the FZ suppress the deformation of austenite during the indenter pressing, which promotes the increase in hardness in austenite.…”

Section: Nano-hardness Test and Analysismentioning

confidence: 99%

Effect of Thermal Aging on the Microstructure and Mechanical Properties of ER308L/Z2CND18.12N2 Dissimilar Welds

Ju,

Liu,

Zhuo

et al. 2023

Materials

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A multi-analytical approach was used to investigate the effect of thermal aging on the microstructure and mechanical properties of ER308L/Z2CND18.12N2. The results demonstrated that fractures occurred preferentially on the ER308L side. Z2CND18.12N2 exhibited superior fracture toughness compared to ER308L regardless of thermal aging time. The ultimate tensile strength significantly increased from 564.5 MPa in the unaged condition to 592.7 MPa to MPa after thermal aging and the fracture mode changed from ductile fracture into a ductile + quasi-cleavage fracture. The fusion zone (FZ) with the chemical composition gradient was about 40 μm from the Z2CND18.12N2 to ER308L. After thermal aging, spinodal decomposition and G-phase precipitation were observed for the first time in the ferrite phase of the FZ. Moreover, the hardness presented the following trend: FZ > ER308L > Z2CND18.12N2. The hardness of the ferrite phase dramatically increased from 6.13 GPa in an unaged condition to 8.46 GPa in a 10,000 h aged condition.

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Section: Nano-hardness Test and Analysismentioning

confidence: 99%

Effect of Thermal Aging on the Microstructure and Mechanical Properties of ER308L/Z2CND18.12N2 Dissimilar Welds

Ju,

Liu,

Zhuo

et al. 2023

Materials

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Effect of pre-strain on thermal aging of austenitic stainless steel weld metal

Li,

He,

et al. 2024

International Journal of Pressure Vessels and Piping

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Microstructure and dynamic fracture behaviors of laser-MAG hybrid welded T-joints of 945 shipbuilding steel with different heat inputs

Guo,

Zhou,

Zhao

et al. 2024

Journal of Laser Applications

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Welded T-joints of 945 shipbuilding steel are widely used in plate-beam connections, and their impact toughness directly affects the service life of shipboard structural components. However, current research efforts have primarily focused on the static mechanical properties of welded T-joints, with few scholars investigating the impact properties of welded T-joints under dynamic loading conditions. In this paper, laser-MAG hybrid welding of 945 shipbuilding steel T-joints is utilized to study the effects of heat input on the microstructure evolution and dynamic mechanical properties of welded T-joints. The results show that the increase in heat input results in a decrease in the cooling rate, which promotes the formation of lath martensite in weld metal and the formation of granular and lath bainite in coarse grain heat affected zone (HAZ). Concurrently, the higher heat input increases the width of the HAZ and leads to grain coarsening, resulting in a 298.9% increase in average grain area when the heat input rises from 12.1 to 14.6 kJ/cm. The changes in martensite content and morphology result in a reduction in the microhardness of welded T-joints. The HAZ becomes the most vulnerable region to dynamic impact loading, and the higher heat input leads to ductile fracture. Compared to high heat input, the drop hammer acceleration decreases by 34.0%, the maximum displacement increases by 45.9%, and the fracture energy increases by 43.1%, for low heat input. The changes in the drop hammer impact metrics further illustrate that welded T-joints with lower heat input are favorable for improving impact toughness.

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Coupling effect of thermal aging and pre-strain on fracture behavior of SMAW welded joints

Cited by 5 publications

References 35 publications

Effect of Thermal Aging on the Microstructure and Mechanical Properties of ER308L/Z2CND18.12N2 Dissimilar Welds

Effect of Thermal Aging on the Microstructure and Mechanical Properties of ER308L/Z2CND18.12N2 Dissimilar Welds

Effect of pre-strain on thermal aging of austenitic stainless steel weld metal

Microstructure and dynamic fracture behaviors of laser-MAG hybrid welded T-joints of 945 shipbuilding steel with different heat inputs

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