Effects of Austenitising Conditions on the Microstructures and Mechanical Properties of Martensitic Steel with Dual Matrix Structure

Bello, K. A.; Hassan, Shukur Bin Abu; Aponbiede, O.

doi:10.4236/jmmce.2012.111006

Cited by 5 publications

(5 citation statements)

References 7 publications

(10 reference statements)

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“…11 Furthermore, the tensile and impact strengths of the developed DP steels increased with intercritical annealing (ICA) temperatures, with optimal properties achieved at 790 °C, owing to the finer microstructure of the phase components and the absence of carbide deposits, which allows for a slight dislocation flow. 12 On the other hand, the effect of temperature on the mechanical properties and fracture behaviours of DP1000 steel, were used to investigate the variations in mechanical properties, by carrying out uniaxial tensile tests in various rolling directions (RD). [13][14] Nowadays, a variety of experimental techniques have been developed by engineers to mechanically test engineering materials exposed to stress, compression, bending, or torsion loading.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

Topilla

Toros

2023

Kemija U Industriji

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The objective of this research was to analyse the stress and strain behaviours of the triaxiality specimens (specimens of different shaping) of dual-phase steels, respectively DP600 and DP800, whose microstructures mainly comprise ferrite and martensite phases. These steels find wide application in the automotive industry, which is constantly searching for better quality materials in the aim of increasing vehicle safety, protecting the environment, and reducing fuel consumption. In this case, for all tested specimens the experimental uniaxial tensile tests were performed at three different strain rates, 0.0083 s −1 , 0.042 s −1 , and 0.16 s −1 , to determine mechanical properties such as stress, strain, yield strength, and ultimate tensile strength of mentioned steels. In addition, uniaxial tensile tests with characteristics similar to those experimental were carried out through the finite element modelling method using the Mat_Picewise_Linear_Plasticity_024 model, to determine the mentioned mechanical properties, but also to determine the failure parameters or plastic strain up to failure, of all triaxiality modelled specimens. The obtained results were validated by comparing the experimental results with numerical simulation results. The comparative scale of accuracy between both steels was made at the fracture strain, and the average accuracy of both steels for the standard (s) specimens was < 1 %, for the (20a) specimens 1.50 %, for the (4a) specimens 4 %, and for (a) specimens 3.50 %. Finally, it was concluded that the proposed material model and calibrated failure data fitted very well.

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Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

Topilla

Toros

2023

Kemija U Industriji

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“…Austenization temperature) followed by rapid quenching where diffussionless transformation takes place results in complete martensite phase. In the later stage the quenched samples are intercritically annealed [14] for short duration and quenched in required medium to obtain ferrite-martensite phases [15] in the required volume fraction.…”

Section: Introductionmentioning

confidence: 99%

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

Sunil

Rajanna

2020

SN Appl. Sci.

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The objective of the present work is to investigate the mechanical properties of the dual phase (DP) steels produced by the intermediate quenching (IQ) technique. To produce the ferrite-martensite microstructure in the dual phase (DP) steel, low carbon micro alloyed steel is intercritically heat treated followed by short intercritical annealing and intermediate quenching using various intercritical temperatures. By varying the intercritical temperature (740, 760, 780, 800, 820 °C) different volume fraction of the ferrite and martensite phases of DP steel samples are produced. These series of dual phase (DP) steel samples were further analyzed through scanning electron and optical microscopy. The experimental investigations have been carried out to find the mechanical properties as per the ASTM testing standards. From the outcomes it is observed that DP780 steel have excellent tensile strength, better hardness and toughness which may be due to the fine distribution and equal volume fraction of ferrite and martensite phases. The enhancement in the mechanical properties of dual phase steel was the effect of intermediate quenching technique. Equal volume fraction of ferrite and martensite phases obtained, at temperature of 780 °C, converted low carbon micro alloyed steel into dual phase steel and also improves its mechanical properties.

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“…The low carbon micro alloyed steels were heated to the austenization temperature followed by the rapid quenching where it forms the martensite phase. The quenched samples were further intercritically annealed [14] for the shorter period and quenched to obtain the required volume fraction of the ferrite-martensite phases. Rajanna S et al [15][16][17][18] studied the microstructure and mechanical properties of the rail steel.…”

Section: Introductionmentioning

confidence: 99%

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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Effects of Austenitising Conditions on the Microstructures and Mechanical Properties of Martensitic Steel with Dual Matrix Structure

Abstract: ABSTRACT

Cited by 5 publications

References 7 publications

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

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

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

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