Effect of Acicular Ferrite and Bainite in API X70 Steel Obtained After Applying a Heat Treatment on Corrosion and Cracking Behaviour

Jacobo, Luis; García-Hernández, R.; López-Morelos, Víctor H.; Contreras, A.

doi:10.1007/s12540-020-00805-7

Cited by 14 publications

(4 citation statements)

References 48 publications

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“…In Figure 12(b,d), the volume fraction of AFs was increased to 61.2% in the T1 steel and 73.5% in the Z1 steel after the thermal simulation welding with a heat of 300 kJ cm −1 . AFs played an essential role in changing crack propagation direction [32,33]. FSPs and PFs were the primary nucleated ferrite on the grain boundary of the austenite, which was not a desirable microstructure to enhance the toughness of steel [34][35][36].…”

Section: Surface Of the Fracture And Microstructure In The Hazmentioning

confidence: 99%

Effect of Zr addition on toughness in the simulated heat-affected zone of high-titanium low-alloy steels

Yao

Liu

Zhang

2023

Ironmaking & Steelmaking

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The effect of Zr addition on the impact energy at −20°C, the microstructure, and inclusions of hightitanium low-alloy steels in the simulated heat-affected zone was investigated. The impact energy of the steel without Zr addition was 25.7 J and increased to 242.9 J for the steel with the addition of 80 ppm Zr. When the heat input was 300 kJ cm−1, the impact energy of the steel without Zr addition was 17.5 J and increased to 140.9 J for the steel with 80 ppm Zr, the nucleation potential of AFs increased from 24.4 /mm2 to 76.7 /mm −2 , and the average nucleation potential of inclusions decreased from 2.02 to 1.67. The grain refinement by the formation of acicular ferrites stemmed from the increase of 1-3 μm Al-Ti-Zr-O inclusions was responsible for the toughness improvement in CGHAZ of the Zr-bearing steel.

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Section: Surface Of the Fracture And Microstructure In The Hazmentioning

confidence: 99%

Effect of Zr addition on toughness in the simulated heat-affected zone of high-titanium low-alloy steels

Yao

Liu

Zhang

2023

Ironmaking & Steelmaking

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“…acicular ferrite has been reported as a microstructure with the potential to achieve both high strength and good toughness because the plates of acicular ferrite nucleate intragranularly on non-metallic inclusions within large austenite grains in weld steels, and then grow in many different orientations maintaining an orientation relationship with the austenite [1][2][3][4][5][6][7][8][9][10][11]. In the high-strength low-alloy (HSLa) steels, however, acicular ferrite is defined as a highly sub-structured and non-equiaxed ferrite that forms on continuous cooling [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

2022

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In-SItu ObServatIOn Of acIcular ferrIte tranSfOrmatIOn In HIgH-StrengtH lOw-allOy Steel uSIng cOnfOcal laSer ScannIng mIcrOScOpyIn-situ observation of the transformation behavior of acicular ferrite in high-strength low-alloy steel using confocal laser scanning microscopy was discussed in terms of nucleation and growth. It is found that acicular ferrite nucleated at dislocations and slip bands in deformed austenite grains introduced by hot deformation in the non-recrystallization austenite region, and then proceeded to grow into an austenite grain boundary. according to an ex-situ eBSD analysis, acicular ferrite had an irregular shape morphology, finer grains with sub-grain boundaries, and higher strain values than those of polygonal ferrite. The fraction of acicular ferrite was affected by the deformation condition and increased with increasing the amount of hot deformation in the non-recrystallization austenite region.

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“…During HT, the material undergoes changes in the crystal structure and phase transformation affecting most of the properties of steel including corrosion properties. As a result of the decline of coarse grains during heating, there is a minor enhancement in the hardenability of steels [13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the inhibiting action of pectin on corrosion of AISI1040 dual-phase steel with ferrite–martensite and ferrite–bainite structure: a comparison in 0.5 M sulphuric acid

et al. 2021

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The adsorption of pectin and corrosion inhibition of dual-phase AISI1040 steel with ferrite–martensite and ferrite–bainite structure in 0.5 M sulphuric acid (H2SO4) solution have been investigated using the weightloss method. This work investigates the adsorption mechanism and quantum chemical calculations of pectin. For a specific set of parameters such as immersion time and concentration of inhibitor, the maximum inhibition efficiency of 83.36% is observed. The inhibition efficiency increased with pectin concentration and decreased with immersion time at 30 ℃. The results from the statistical analysis show that the concentration of inhibitor is having the highest influence with a 43.87% contribution on the inhibition efficiency. The adsorption study revealed that the Langmuir adsorption isotherm gave the best-fit results out of all the isotherms studied. Theoretical studies based on density functional theory supported experimental observations. From the results, it was also observed that lower weight loss and better inhibition efficiency are achieved in the case of ferrite–bainite when compared to the ferrite–martensite structure. Surface characterization confirmed corrosion and inhibition on the surface of the metal as the surface became uneven when exposed to a corrosive medium and smooth when immersed in the inhibited solution.

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Effect of Acicular Ferrite and Bainite in API X70 Steel Obtained After Applying a Heat Treatment on Corrosion and Cracking Behaviour

Cited by 14 publications

References 48 publications

Effect of Zr addition on toughness in the simulated heat-affected zone of high-titanium low-alloy steels

Effect of Zr addition on toughness in the simulated heat-affected zone of high-titanium low-alloy steels

Archives of Metallurgy and Materials

Analysis of the inhibiting action of pectin on corrosion of AISI1040 dual-phase steel with ferrite–martensite and ferrite–bainite structure: a comparison in 0.5 M sulphuric acid

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