Aging kinetics and mechanical properties of copper-bearing low-carbon HSLA-100 microalloyed steel

Sohrabi, Mohammad Javad; Mirzadeh, Hamed; Mehranpour, Mohammad Sajad; Heydarinia, Ali; Razi, R.

doi:10.1016/j.acme.2019.09.001

Cited by 20 publications

(6 citation statements)

References 24 publications

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“…[ 34 ] Furthermore, in previous studies on HSLA‐100, a secondary hardening peak (H 900) was observed as a result of copper precipitation, because, in the present study, the temperature (625 °C) is out of the copper precipitation temperature range, the secondary hardening peak was not observed. [ 43 ]…”

Section: Resultsmentioning

confidence: 99%

“…[34] Furthermore, in previous studies on HSLA-100, a secondary hardening peak (H 900) was observed as a result of copper precipitation, because, in the present study, the temperature (625 C) is out of the copper precipitation temperature range, the secondary hardening peak was not observed. [43] The microstructural evolutions during tempering are shown in Figure 7. The CR-F-540 has not fully recrystallized up to 540 min (partial recrystallization occurred) due to the presence of elongated grains (Figure 7a).…”

Section: Hardness and Microstructure During Temperingmentioning

confidence: 99%

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Synergistic Investigations of Post‐Deformation Annealing and Initial Microstructure on the Mechanical Properties of High Strength Low Alloy (HSLA)‐100 Steel

Heydarinia

Koushki

Rasooli

et al. 2021

steel research int.

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A high strength low alloy (HSLA)‐100 steel with different initial microstructures (ferrite and martensite) is processed by cold rolling at room temperature to the reduction of thickness about 70%. It is found that the recrystallization kinetics of the sample with a martensitic microstructure is higher than the sample with a ferritic microstructure. Moreover, the results show that the partitioning factor of substitution alloying elements is less effective than the strain in the martensitic phase transformation. Also, hardness results show that the samples with a martensitic microstructure have drastic drop compared with the samples with a ferritic microstructure, which is related to continuous recrystallization. Remarkable ultimate tensile strength and elongation to failure (829 MPa and 27.7%, respectively) are achieved for cold‐rolled martensite after tempering at 625 °C for 360 min. Accordingly, it is also found that the reason for remarkable mechanical properties is the simultaneous presence of recrystallized fine‐grained and deformed martensite, which forms an inhomogeneous microstructure.

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Section: Resultsmentioning

confidence: 99%

Section: Hardness and Microstructure During Temperingmentioning

confidence: 99%

Synergistic Investigations of Post‐Deformation Annealing and Initial Microstructure on the Mechanical Properties of High Strength Low Alloy (HSLA)‐100 Steel

Heydarinia

Koushki

Rasooli

et al. 2021

steel research int.

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show abstract

“…The microstructure of the tempered sample for the tempering condition of 550°C-10 min in Figure 1 reveals the formation of carbides and tendency toward the disappearance of the lath martensitic morphology, which is consistent with the previous reports on tempering of steels. [23][24][25][26][27] In the microstructure of the tempered sample for the tempering condition of 700°C-10 min, the lath martensite has been replaced by a microstructure featuring spheroidized carbide, [11,[28][29][30][31][32] and hence, it leads to the lower hardness of this sample. Increasing the tempering time to 4 h at 700°C resulted in the coarsening of the carbides and decreased hardness as can be observed in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Tempering kinetics and corrosion resistance of quenched and tempered AISI 4130 medium carbon steel

Mosayebi

Soleimani

Mirzadeh

et al. 2021

Materials & Corrosion

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The kinetics and the effects of tempering on the corrosion resistance of AISI 4130 steel were studied. The tempering activation energy was close to that for the diffusion of C in α-iron. This implies that the tempering kinetics in this steel is controlled by carbon diffusion. By increasing the time and temperature of tempering, the corrosion current density (i corr ) in the polarization curves decreased whereas the diameter of the semicircular arc in the Nyquist plots increased, which implies higher corrosion resistance. The i corr was successfully related to hardness, which actually indicates the effect of microstructure.Based on these findings, the quench and tempering treatment was used to adjust both the hardness and corrosion resistance of the AISI 4130 steel.

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“…High-strength low-alloy (HSLA) steels with yield strength (YS) >690 MPa are in great demand in shipbuilding, construction, bridges, and offshore structures owing to their exceptional combination of strength and toughness, low yield ratio (YR) (ratio of YS to tensile strength), excellent weather resistance, and good weldability [1][2][3]. To achieve superior comprehensive properties, alloy design is very important.…”

Section: Introductionmentioning

confidence: 99%

“…Quenching is used to obtain the martensitic or bainitic microstructure for increasing the strength [6][7] while tempering improves ductility and toughness. However, the YR of HSLA steels by Q&T processing is usually higher than 0.90 [3]. How to decrease the YR became an increas-ingly important issue for HSLA steels with a minimum YS of 690 MPa.…”

Section: Introductionmentioning

confidence: 99%

Determining role of heterogeneous microstructure in lowering yield ratio and enhancing impact toughness in high-strength low-alloy steel

Gao

et al. 2021

Int J Miner Metall Mater

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Here we present a novel approach of intercritical heat treatment for microstructure tailoring, in which intercritical annealing is introduced between conventional quenching and tempering. This induced a heterogeneous microstructure consisting of soft intercritical ferrite and hard tempered martensite, resulting in a low yield ratio (YR) and high impact toughness in a high-strength low-alloy steel. The initial yielding and subsequent work hardening behavior of the steel during tensile deformation were modified by the presence of soft intercritical ferrite after intercritical annealing, in comparison to the steel with full martensitic microstructure. The increase in YR was related to the reduction in hardness difference between the soft and hard phases due to the precipitation of nano-carbides and the recovery of dislocations during tempering. The excellent low-temperature toughness was ascribed not only to the decrease in probability of microcrack initiation for the reduction of hardness difference between two phases, but also to the increase in resistance of microcrack propagation caused by the high density of high angle grain boundaries.

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Aging kinetics and mechanical properties of copper-bearing low-carbon HSLA-100 microalloyed steel

Cited by 20 publications

References 24 publications

Synergistic Investigations of Post‐Deformation Annealing and Initial Microstructure on the Mechanical Properties of High Strength Low Alloy (HSLA)‐100 Steel

Synergistic Investigations of Post‐Deformation Annealing and Initial Microstructure on the Mechanical Properties of High Strength Low Alloy (HSLA)‐100 Steel

Tempering kinetics and corrosion resistance of quenched and tempered AISI 4130 medium carbon steel

Determining role of heterogeneous microstructure in lowering yield ratio and enhancing impact toughness in high-strength low-alloy steel

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