A comprehensive evaluation of tempering kinetics on 3rd generation advanced high strength steels

Ramachandran, Dileep Chandran; Midawi, Abdelbaset R.H.; Shojaee, M.; Sherepenko, Oleksii; Ghassemi-Armaki, Hassan; Biro, E.

doi:10.1016/j.mtla.2022.101644

Cited by 12 publications

(11 citation statements)

References 47 publications

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“…The tempering reaction results in the decomposition of the martensite phase to form ferrite and carbide (Fe3C). The tempering process is a function of time and temperature [17]. The relatively short tempering time of 5 minutes results in partial tempering, with some martensite islands in the final microstructure.…”

Section: Hot Stampingmentioning

confidence: 99%

Hot-forming of a 980 MPa third generation advanced high strength steel

Midawi

Tolton

George

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper considers the effect of processing route on the final microstructure hardness and tensile behavior of a 980 MPa third generation advanced high strength steel (3G-AHSS). Of particular interest is the use of a hot stamping thermal schedule that mimics a quench and partition (Q&P) heat treatment process normally used to produce Q&P grade steel sheet. For comparison purposes, samples were also produced using a quench and temper (Q&T) processing history. The experiments were performed using a Gleeble 3500 thermo-mechanical simulator system. Large coupons were produced using both processing routes from which microstructure, hardness, and tensile samples were extracted. Mechanical properties results were compared with the as-received material. Both processing routes resulted in strength levels that were close to that of the as-received material; however, the total elongation of the Q&P processed samples was 52% higher than that of the Q&T processed material.

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Section: Hot Stampingmentioning

confidence: 99%

Hot-forming of a 980 MPa third generation advanced high strength steel

Midawi

Tolton

George

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The characterization of ε-carbide was documented in our prior research. 7) The ε-carbide has the ability to effectively pins the movement of dislocations and hinder the propagation of cracks. PB noticeably reduced elemental segregation and eliminated the solidified liquation formed after the welding.…”

Section: Resultsmentioning

confidence: 99%

“…PB noticeably reduced elemental segregation and eliminated the solidified liquation formed after the welding. 7) Examination of the AWS-PB load-displacement curve shows that it may be divided into distinct regions. Region 1 displays a linear loading rate, Region 2 shows a gradual decrease in loading rate, followed by a sudden increase in loading rate (Region 3), and final fracture (Region 4).…”

Section: Resultsmentioning

confidence: 99%

“…However, this brittle fracture mode was eliminated after PB treatment. 7) In general, during deformation, two main sources of dislocation generations exist: statistically stored dislocations (SSD), and geometrically necessary dislocations (GND). 8) The former is generated via Frank-Read sources, grain boundary ledges, etc., during deformation and is the main source of dislocations generation during plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

“…17) Furthermore, Wilson et al 15) proposed a third mechanism, where the formation of solute clusters eventually results in a fine transition carbide precipitation. In high-carbon martensitic steel, this transition carbide precipitation could be accompanied by the softening of the martensitic matrix, 18,19) which has been accepted as the precipitation of ε-carbides from PB improves cross-tension properties. 20) The abovementioned theories regarding the strengthening effect of SSA have been explained and used to understand the hardening aspect of PB.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Paint Baking Treatment on Mechanical Properties of Resistance Spot Welded Q&P 980 Steel

Ramachandran,

Salandari-Rabori,

Midawi

et al. 2024

ISIJ Int.

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This study investigates the impact of paint baking on the macro and micro-mechanical properties of resistance spot welds in quenched and partitioned 980 steels. It is observed that paint baking enhances both peak load and energy absorption during cross-tension tests, as indicated by load-displacement curves. Four different regions were identified from the load-displacement curves after paint baking. An intriguing observation was a quick increase in the loading rate following a prior decrease, attributed to change in crack propagation behavior rather than improved work hardening. The study further simulated the upper-critical heat-affected zone using a Gleeble thermo-mechanical simulator to evaluate flow strength and work hardening. The Kocks-Mecking strain-hardening model was employed to analyze work hardening behavior in the studied conditions.

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