Characterization of Microstructures and Fatigue Properties for Dual-Phase Pipeline Steels by Gleeble Simulation of Heat-Affected Zone

Zhao, Zuopeng; Xu, Pengfei; Cheng, Hong; Miao, Jili; Xiao, Furen

doi:10.3390/ma12121989

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…18,19 Although thermal simulation methods have been widely used to study the microstructure and mechanical properties of the HAZ, 20,21 reports on the fatigue performance of the HAZ mainly focused on the properties of the overall welded joint, 22,23 and little work has been done to investigate the fatigue properties of each sub-HAZ in an X80 pipeline, especially in terms of fatigue crack growth. 24 In addition, the performance of ICHAZ has been rarely reported. Despite its proximity to the BM in the HAZ, the properties of the ICHAZ can differ from those of the BM.…”

Section: Introductionmentioning

confidence: 99%

Research on the fatigue properties of sub‐heat‐affected zones in X80 pipe

Qiao

Wang

et al. 2020

Fatigue Fract Eng Mat Struct

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Pipeline transmission is an essential means of oil and gas transportation, but its safety is threatened by fatigue fracture that generally occurs in the heat-affected zone (HAZ) adjacent to welded joints of the pipeline. Therefore, it is important to determine the fatigue properties of HAZ. In this work, the microstructure and mechanical properties in the HAZ of a X80 pipe were accurately simulated by thermal simulation. The fatigue life and crack growth rate of typical sub-HAZ were tested. The results showed that fine grain HAZ exhibited the lowest strength and fatigue life. In contrast, coarse grain HAZ had the highest strength, but its fatigue life was lower than that of the intercritical HAZ. The microstructure of each sub-HAZ and the effect of this structure on fatigue properties were analysed and discussed in detail. The results provide insight into the effects of microstructure and mechanical properties on the service safety of pipeline transportation.

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Section: Introductionmentioning

confidence: 99%

Research on the fatigue properties of sub‐heat‐affected zones in X80 pipe

Qiao

Wang

et al. 2020

Fatigue Fract Eng Mat Struct

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“…Our results showed that during the austenite grain refining process and the precipitation mechanisms, the presence of Nb, V, and Ti formed particles of carbides, nitrides, or a combination of both. This result, combined with the formation of precipitated carbonitrides, creates a fine dispersion in the matrix [36][37][38][39][40][41]. The presence of precipitates was confirmed by the presence of Nb, V, Ti, C, and N peaks using the XRD technique.…”

Section: Discussionmentioning

confidence: 93%

Analysis of the influence of the composition and quenching parameters on the performance of some dual phase in HSLA steels

Borges,

Medeiros,

Biehl

et al. 2023

Matéria (Rio J.)

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Due to its combination of high mechanical properties, good formability, and low production cost, steel is a key material with potential for improvement in the metallurgical industry. Based on these conditions, this research evaluated the influence of material composition and incomplete austenitization parameters on the final metallurgical and mechanical properties of high-strength microalloyed steels after cooling in a medium with high severity. The applied cycle was based on the intercritical thermal treatment of microalloyed steels with niobium (Nb) and titanium (Ti) to increase the mechanical resistance and guarantee the tenacity of the material. An experimental study was carried out testing three intercritical temperatures, 806 °C, 775 °C, and 740 °C, with subsequent cooling in polymeric solutions in water. The studies showed that the intercritical temperature variation directly contributed to the difference in the second phase microstructure present in the samples. The heat treatment findings resulted in a microhardness of 434.2 HV0.01, characterizing the low-carbon martensite. The presence of a matrix consisting of ferrite and a second phase of low-carbon martensite promoted the typical behavior of dual phase steel. In the x ray diffraction, the presence of retained austenite was not evidenced, indicating the efficiency of the cooling rate. The experiments confirmed the influence of different engineering parameters and intercritical treatment on the mechanical properties. The study enriches the current knowledge about the development of variables for the development of dual phase steel from microalloying elements.

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“…In the reciprocating loading process, a large number of dislocations hit the ferrite/martensitic interface, resulting in fatigue failure. 26)…”

Section: Fatigue Properties Of Rsw Jointsmentioning

confidence: 99%

Fatigue Characteristics of DP780 Steel Spot Welding Joints with Different Static Fracture Modes

et al. 2021

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Two specimens made of DP780 dual phase steels were produced by resistance spot welding and the quality was evaluated by the static tension-shear test and low cycle fatigue test. The fracture characteristics, macrostructure, microstructure, microhardness distribution and fatigue morphology were studied. The results show that the nugget size and microhardness gradient in the heat affected zone affect the static loadbearing performance and the fracture mode. Meanwhile, applied load, microhardness gradient in the heat affected zone and inclined angle on faying surface caused by macro deformation have influence on the low cycle fatigue life. Compared with the specimen which has high static load-bearing capacity, samples with lower static load capacity has a higher fatigue life and plastic deformation characteristics under the same applied load of 40% of its static load-bearing capacity, which indicates that the applied load is the controlling factor in the low cycle fatigue test.

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Characterization of Microstructures and Fatigue Properties for Dual-Phase Pipeline Steels by Gleeble Simulation of Heat-Affected Zone

Cited by 9 publications

References 21 publications

Research on the fatigue properties of sub‐heat‐affected zones in X80 pipe

Research on the fatigue properties of sub‐heat‐affected zones in X80 pipe

Analysis of the influence of the composition and quenching parameters on the performance of some dual phase in HSLA steels

Fatigue Characteristics of DP780 Steel Spot Welding Joints with Different Static Fracture Modes

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