Unexpected Effect of Nb Addition as a Microalloying Element on Mechanical Properties of δ-TRIP Steels

Shiri, Sajad Gholami; Jahromi, S.A. Jenabali; Palizdar, Yahya; Belbasi, Majid

doi:10.1016/s1006-706x(16)30148-0

Cited by 17 publications

(16 citation statements)

References 20 publications

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“…It is approximately 12.6% lighter than that without the aluminum addition, which has a density of 7.8145 × 10 3 kg/m 3 . Many studies have been reported on mechanical deformation properties [5,6], microstructures [7,8], and properties of δ-TRIP steel [9,10]. However, there is an insufficient understanding of the high-temperature crack sensitivity of the δ-TRIP steel.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Mechanical Properties of 4.5%Al δ-TRIP Steel

2019

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The high-temperature mechanical properties of a 4.5% Al-containing δ-transformation-induced plasticity (TRIP) steel were studied by using the Gleeble 3500 thermomechanical simulator. The zero ductility temperature (ZDT) and the zero strength temperature (ZST) were measured, and the brittle zones were divided. The phase transformation zone was determined by differential scanning calorimetry (DSC). The temperature of the phase transformation and the proportion of the phase were calculated by the Thermo-Calc software. The ZDT and the ZST of the 4.5% Al-containing δ-TRIP steel are 1355 and 1405 °C, respectively. The first brittle zone and the third brittle zone of the steel are 1300–1350 °C and 800–975 °C, respectively. The reason for the embrittlement of the third brittle zone of the 4.5% Al-containing δ-TRIP steel is that the α-ferrite formed at the austenite grain boundary causes the sample to crack along the grain boundary under stress. The ductility of the 4.5% Al-containing δ-TRIP steel decreases first and then increases with the increase of the α-ferrite. When the proportion of the α-ferrite reaches 37%, the reduction of area (RA) of the 4.5% Al-containing δ-TRIP steel is reduced to 44%. The 4.5% Al-containing δ-TRIP steel has good resistance to the high-temperature cracking.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Mechanical Properties of 4.5%Al δ-TRIP Steel

2019

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“…Transformation induced plasticity (TRIP) steels has attracted great research attentions as third generation of advanced high strength steel (AHSS) to improve the passenger safety and lower fuel consumption . Since these alloys have specific properties and exhibiting an excellent combination of high strength, superior ductility, and good crashworthiness, the inclinations to use these alloys have been developed .…”

Section: Introductionmentioning

confidence: 99%

“…Essentially, the enhanced energy absorption behavior and work hardening rate of these alloys are attributed to the TRIP effect that involves transformation of retained austenite to martensite . Low alloyed C–Mn–Si TRIP‐aided steels have a multiphase microstructure consisting of ferrite, bainite, and higher C retained austenite . These alloys offer excellent mechanical properties in terms of elongation and strength which is caused by the complex synergy between different phases, that is, ferrite matrix, dispersed bainite, and metastable retained austenite that transforms during deformation .…”

Section: Introductionmentioning

confidence: 99%

“…Low alloyed C–Mn–Si TRIP‐aided steels have a multiphase microstructure consisting of ferrite, bainite, and higher C retained austenite . These alloys offer excellent mechanical properties in terms of elongation and strength which is caused by the complex synergy between different phases, that is, ferrite matrix, dispersed bainite, and metastable retained austenite that transforms during deformation . The occurrence of TRIP effect in the aforementioned type of steels is a consequence of the presence of a high level of Si in the steel composition which prevents the formation of cementite phase .…”

Section: Introductionmentioning

confidence: 99%

“…The occurrence of TRIP effect in the aforementioned type of steels is a consequence of the presence of a high level of Si in the steel composition which prevents the formation of cementite phase . Recently, Si has been replaced by Al to improve the poor surface quality of Si‐TRIP steels . δ‐TRIP steel, as a new class of TRIP steels which relies on the permanent presence of δ‐ferrite from the solidification process, exhibits superior advantages such as non‐creation of fully martensitic structure during rapid cooling (especially during spot welding) and also better hot formability because of recovery of δ‐ferrite phase during thermomechanical process .…”

Section: Introductionmentioning

confidence: 99%

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The effect of Nb on microstructure, mechanical, and corrosion behavior of low Mn, microalloyed δ‐TRIP steel; a comparative study

Shiri¹,

Rahsepar²,

Jahromi³

et al. 2018

Materials & Corrosion

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The aim of the present study was to examine the feasibility of achieving a better combination of yield strength, ductility, and corrosion resistance of δ‐TRIP steel through the concept of microalloying. Three δ‐TRIP steels with different contents of Nb (0, 0.025, 0.076 wt%) were subjected to the microstructural, mechanical, and electrochemical examination. ASTM A283 and ASTM A516 steels were taken as comparative samples. The obtained results revealed a threefold increase in strength × ductility products of TRIP steels (35 255 MPa%) than comparative samples (12 760 MPa%) due to the TRIP effect and multiphase nature of the TRIP steel. The addition of Nb to the TRIP steel led to an unexpected decrease in the ultimate strength (from 1167 to 955 MPa) but an increase in ductility (from 30.21 to 31.78%) and corrosion resistance. The results of the electrochemical measurements showed that while A516 alloy exhibited the lowest corrosion resistance, the corrosion resistance of TRIP specimens was significantly increased by the addition of Nb which resulted in enhancement of the charge transfer resistance of the steel and indicates the superior corrosion resistance of the steel with 0.076% Nb.

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Dendrite Structure, Spot Segregation and Banded Defect of Gear Steel in Continuous Casting and Rolling Process

Wang

Chen²,

et al. 2023

Metall Mater Trans B

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Unexpected Effect of Nb Addition as a Microalloying Element on Mechanical Properties of δ-TRIP Steels

Cited by 17 publications

References 20 publications

High-Temperature Mechanical Properties of 4.5%Al δ-TRIP Steel

High-Temperature Mechanical Properties of 4.5%Al δ-TRIP Steel

The effect of Nb on microstructure, mechanical, and corrosion behavior of low Mn, microalloyed δ‐TRIP steel; a comparative study

Dendrite Structure, Spot Segregation and Banded Defect of Gear Steel in Continuous Casting and Rolling Process

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