Evaluation of mechanical properties of ferrite-martensite DP steels produced through intermediate quenching technique

Sunil, B. Ratna; Rajanna, S.

doi:10.1007/s42452-020-03246-4

Cited by 9 publications

(10 citation statements)

References 12 publications

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“…Fracture toughness of medium carbon steel using circumferential notched tensile (CNT) specimens [30] was carried out and found that the results obtained were in close relation with the literature [29]. In the present work, the main aim is to brief review on the fracture toughness of the dual phase steel produced through intermediate quenching (IQ) [31] technique. The motivation to use the IQ samples is that, as the martensite fraction increases the martensite cracking decreases [21] in the dual phase steels.…”

Section: Introductionmentioning

confidence: 72%

“…he material used in the present work is the hot rolled low carbon micro alloyed steel plate of 8mm thick. In its chemical composition, it observed that the major alloying elements are Ni-0.4%, Mn-1.32%, C-0.16%, Si-0.42% [31]. The some of the minor elements include S, P, Mo, V, B and Cr, which are also influence the performance of the DP steel.…”

Section: Materials and Preparationmentioning

confidence: 99%

“…The intercritical heat treatment process has been carried out in a laboratory thermocouple controlled muffle furnace. The lower critical (AC1) and upper critical (AC3) temperatures [31] were determined. The heat treatment procedure followed is as mentioned by the Sunil B et al [31].…”

Section: Materials and Preparationmentioning

confidence: 99%

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Effect of the intermediate quenching on fracture toughness of ferrite-martensite dual phase steels

Sunil¹,

Rajanna²

2020

Frattura Ed Integrità Strutturale

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The main aim of the research work is to examine the fracture toughness of the dual phase steels prepared using the intermediate quenching method. The ferrite-martensite dual phase (DP) steel is produced using low carbon micro alloyed steel by the heat treatment and intercritical quenching technique using various intercritical temperatures such as 740,760,780,800 and 820oC. The samples of the produced dual phase steel are analyzed for their microstructure using optical microscope. The fracture toughness investigations for the dual phase steel have been carried out using ASTM standard testing procedure. From the results it is observed that the fine distribution and equal volume fraction of ferrite and martensite phases at 780oC. The effect of which, the A780 steel has demonstrated excellent fracture toughness which is the result of intermediate quenching technique. The fractography analysis it is clear that the ductile initiated brittle fracture is occurred which is due to the increased hard martensite phase and the increment in the stress accumulation at the ferrite which also leads to the higher elongation.

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Section: Introductionmentioning

confidence: 72%

Section: Materials and Preparationmentioning

confidence: 99%

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Effect of the intermediate quenching on fracture toughness of ferrite-martensite dual phase steels

Sunil¹,

Rajanna²

2020

Frattura Ed Integrità Strutturale

Self Cite

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“…[ 47 ] Hence, with the increase of the strain‐associated FPAGB, K ML is decreased and k is increased. Serror's research results [ 48 ] show that the increase in the k value is beneficial to increase the uniform elongation, and hence total elongation. Thus, the strain‐associated FPAGB continuously distributed can effectively separate the martensite lamellae, which effectively promotes the cooperative deformation among the multiphase and increases the elongation.…”

Section: Resultsmentioning

confidence: 99%

“…In summary, the distribution of ferrite and martensite proved to play an important role on mechanical properties for traditional low-alloyed dual-phase steels, and the heat treatment is an effective method to modify the phase distribution. [48,49] However, for high-silicon or high-aluminum-alloyed steels, the laminated microstructure formed during hot working, and the traditional heat treatment had little effect on change in the phase distribution. One effective way is to increase the deformation strain to make laminated microstructure much flatter, [50] but it is very difficult to increase the compression ratio for industrial production.…”

Section: Effect Of Strain-associated Fpagb On Mechanical Propertiesmentioning

confidence: 99%

Strain‐Associated Alpha‐Ferrite Phase Transformation in a Micro‐Laminated Low‐Density Steel

Liú

Shang

et al. 2022

steel research int.

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Aluminum-alloyed low-density steels have recently received significant attention because of the advantage in strength-todensity ratio [1] and superior corrosion resistance. [2][3][4] Aluminum is a strong ferrite-forming element and expands both α-ferrite and δ-ferrite phase region. Thus, the addition of aluminum in steel can result in δ-ferrite that always exists below solidification temperature, in spite of the addition of austenitic stabilizing elements. Under the action of deformation, the dualphase composed of δ-ferrite and austenite is expected to be elongated and forms micro-laminated microstructure. [5][6][7][8][9][10][11][12][13][14][15][16][17] Except prior δ-ferrite lamellae, through diversified alloy design, hot working process, and heat treatment process, the microstructure transformed from prior austenite can be designed as dual-phase or multiphase constituents, containing austenite, [5][6][7][8][9][10][12][13][14] α-ferrite, [5][6][7][8]12] martensite, [5][6][7][8][9][10][11][12][13] pearlite, [10] and bainite, [10] and the fraction range of each phase is also wide. Accordingly, the mechanical properties also vary among different phases. Hence, micro-laminated low-density steels have a broad application prospect, with extraordinary combinations of mechanical properties. [8,[10][11][12][13] Based on the microstructure, the deformation-induced evolution of the microstructure and the fracture mechanism are also complex. In general, δ-ferrite is a brittle phase, while the complex microstructure transformed from the original austenite has superior plasticity and resistance to crack growth. [17,18] Cracks propagate preferably into δ-ferrite or at the interface l ayer along the δ-ferrite {100} planes. [15,18] The embrittlement of δ-ferrite is because of higher aluminum content. [17][18][19] With the increase of aluminum content, the reduced mobility of dislocations [19,20] and the formation of ordered structure [17][18][19] result in lower ductility and toughness. Given that the retained austenite stability is critical for fracture resistance, [17] previous studies have focused on controlling the content and stability of retained austenite.However, studies on α-ferrite phase transformation on δ-ferrite and corresponding effect on mechanical properties are rare. Li et al. [14] reported that coarse δ-ferrite is harmful to mechanical properties. The grain refinement of ferrite is simultaneously beneficial to both strength and toughness.

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Effect of Microstructural Evolution on the Mechanical Properties of Intercritical Heat‐Affected Zone of Quenched‐and‐Tempered Ultrahigh‐Strength Steel

Zhang

Wen

et al. 2022

steel research int.

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In order to investigate the effect of microstructural evolution on the mechanical properties in the intercritical heat-affected zone (ICHAZ) of the quenched-andtempered ultrahigh-strength steel, the simulated ICHAZ samples with different austenite transformation degrees (0%, 25%, 50%, 75%, and 100%) are prepared. These samples are named IC-0%, IC-25%, IC-50%, IC-75%, and IC-100%, respectively. The fine-grained fresh martensite (FM) is produced in the partial austenite transformation during cooling. The austenite in IC-100% with the lowest C and Mn content is transformed into a mixture of FM and granular bainite (GB). The IC-0% and the IC-25% are softened by about 20 HV 10 compared with that of the base metal. When the matrix is transformed into quasi-polygonal ferrite (QPF), the large difference in microhardness between FM and QPF causes the instability of their interfaces, resulting in the deterioration of the impact toughness in IC-50% and IC-75%. However, from IC-75% to IC-100%, the impact toughness has been improved from 18.0 to 28.9 J. In addition to the less embrittlement of microstructure in IC-100%, the lower microhardness difference between FM and GB is the main reason.

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Evaluation of mechanical properties of ferrite-martensite DP steels produced through intermediate quenching technique

Cited by 9 publications

References 12 publications

Effect of the intermediate quenching on fracture toughness of ferrite-martensite dual phase steels

Effect of the intermediate quenching on fracture toughness of ferrite-martensite dual phase steels

Strain‐Associated Alpha‐Ferrite Phase Transformation in a Micro‐Laminated Low‐Density Steel

Effect of Microstructural Evolution on the Mechanical Properties of Intercritical Heat‐Affected Zone of Quenched‐and‐Tempered Ultrahigh‐Strength Steel

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