The influence of the austempering temperature on the transformation behavior and properties of ultra-high-strength TRIP-aided bainitic–ferritic sheet steel

Zhao, Zhengzhi; Yin, Haiqing; Zhao, Ai Min; Gong, Ziyu; He, Jianguo; Tong, Tingting; Hu, Hao

doi:10.1016/j.msea.2014.06.090

Cited by 31 publications

(17 citation statements)

References 13 publications

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“…The strain-induced transformation of γ r simultaneously relaxes the localized stress concentration at the matrix/second phase interface to suppress the void initiation (Sugimoto et al 2000). Recently, (Zhao et al 2014) have reported that the film type γ r transforms into martensite and hardens the bf matrix. The resultant compressive stress on the bf matrix prevents crack propagation.…”

Section: Tbf Steel Austempered At Temperatures Lower Than M Smentioning

confidence: 99%

“…7e, f ) due to the reduced nucleation kinetics of bainite formation at higher T A . Increase in lath thickness is also attributed to low dislocation density due to the high temperatures (Zhao et al 2014). Austempering at these higher temperatures leads to a small degree of super cooling that reduces the driving force of bainite formation.…”

Section: Tbf Steel Austempered At Temperatures Lower Than M Smentioning

confidence: 99%

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Structure-properties relationship in TRIP type bainitic ferrite steel austempered at different temperatures

El-Din

Showaib

Zaafarani

et al. 2017

Int J Mech Mater Eng

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Background: Attractive properties of TRIP-type bainitic ferrite (TBF) steel ascribe to its unique microstructure of lath structure bainitic ferrite matrix and interlath retained austenite films. This work is concerned with obtaining ultra high-strength hot forged TBF steel with high elongation and excellent strength-elongation balance. Methods: The effect of austempering temperature on the microstructure along with its retained austenite characteristics and tensile properties of a hot forged TBF steel was studied. A detailed investigation correlating the steel structure and its tensile properties was carried out. Results: Tensile strength ranging from 1058 to 1552 MPa was achieved when the hot forged steel was austempered at (325 -475°C). Conclusions: Ultra high tensile strength of 1058 MPa, large total elongation of 29% and excellent strengthelongation balance of 30 GPa % were attained when the steel was austempered at 425°C. The large total elongation of this steel is mainly due to the uniform fine lath structure matrix and the pronounced TRIP effect of a large amount of retained austenite films which prevents a rapid decrease of strain hardening rate at low strain and leads to a relatively high strain hardening at high strain level. Rapid transformation of blocky retained austenite at low strain in the hot forged TBF steel austempered at higher temperatures results in a rapid increase of initial strain hardening. In addition, the coarse microstructure that contains large blocks of retained austenite / martensite and the insufficient numbers of bainitic ferrite lathes and retained austenite films deteriorate the total elongation and the strength-elongation balance of the TBF austempered at 475°C.

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Section: Tbf Steel Austempered At Temperatures Lower Than M Smentioning

confidence: 99%

Section: Tbf Steel Austempered At Temperatures Lower Than M Smentioning

confidence: 99%

Structure-properties relationship in TRIP type bainitic ferrite steel austempered at different temperatures

El-Din

Showaib

Zaafarani

et al. 2017

Int J Mech Mater Eng

View full text Add to dashboard Cite

show abstract

“…TRIP) steel has been widely applied due to its combination of high strength and high toughness [9][10][11][12][13]. However, compared to the super high-strength martensitic steel with the tensile strength of more than 1200 MPa, the tensile strength (about 1000 MPa) of TRIP steels is relatively low because of the soft ferrite matrix [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Comparison of three-body impact abrasive wear behaviors for quenching–partitioning–tempering and quenching–tempering 20Si2Ni3 steels

Wang

Chang

et al. 2016

Wear

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“…After tensile deformation, all the blocky retained austenite transformed to martensite, and a little film-like retained austenite remain the same. This means that the mechanical stability of blocky retained austenite is not so well, or the blocky retained austenite is easier to transform to martensite in the early stage of deformation resulting in a high tensile strength during the tensile test [12]. Film-like retained austenite grains were not considered to contribute to the TRIP effect in TRIP steels due to their extremely high stability [13,14].…”

Section: Mechanical Behaviormentioning

confidence: 99%

Effect of annealing temperature on microstructure and mechanical properties of a high Al-low Si TRIP steel

Zhao

Chen

Yan

et al. 2015

MATEC Web of Conferences

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Abstract. By using optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), electron back scattered diffraction (EBSD) and tensile test, the effect of annealing temperature on microstructure and mechanical properties of a high Al-low Si TRIP steel was investigated. The results show that TRIP effect can be obtained when annealing temperature is above A c3 due to the existence of -ferrite in this high Al-low Si TRIP steel. That is to say, the microstructure consisting of ferrite, bainite and retained austenite can be obtained when annealing temperature is above A c3 . Furthermore, the tensile strength and the product of strength and elongation decrease with increasing annealing temperature when annealing temperature is above A c3 .

show abstract

The influence of the austempering temperature on the transformation behavior and properties of ultra-high-strength TRIP-aided bainitic–ferritic sheet steel

Cited by 31 publications

References 13 publications

Structure-properties relationship in TRIP type bainitic ferrite steel austempered at different temperatures

Structure-properties relationship in TRIP type bainitic ferrite steel austempered at different temperatures

Comparison of three-body impact abrasive wear behaviors for quenching–partitioning–tempering and quenching–tempering 20Si2Ni3 steels

Effect of annealing temperature on microstructure and mechanical properties of a high Al-low Si TRIP steel

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