Quantification of bake hardening effect in DP600 and TRIP700 steels

Ramazani, Ali; Bruehl, Sonja; Gerber, T.L.; Bleck, Wolfgang; Prahl, Ulrich

doi:10.1016/j.matdes.2014.01.001

Cited by 85 publications

(37 citation statements)

References 34 publications

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“…In comparison with traditional low carbon and high strength low alloy steels, dual phase (DP) steels provide a combination of good formability and strength [4,5]. DP steels are attractive to automakers as they can offer safety, affordability, fuel efficiency, and environmental responsibility [6][7][8]. Wang et al [9] studied the high strain rate behavior of high strength DP steels.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

Ramazani

Mukherjee

Abdurakhmanov

et al. 2015

Metals

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Abstract:Resistance spot welding (RSW) as a predominant welding technique used for joining steels in automotive applications needs to be studied carefully in order to improve the mechanical properties of the spot welds. The objectives of the present work are to characterize the resistance spot weldment of DP600 sheet steels. The mechanical properties of the welded joints were evaluated using tensile-shear and cross-tensile tests. The time-temperature evolution during the welding cycle was measured. The microstructures observed in different sites of the welds were correlated to thermal history recorded by thermocouples in the corresponding areas. It was found that cracks initiated in the periphery region of weld nuggets with a martensitic microstructure and a pull-out failure mode was observed. It was also concluded that tempering during RSW was the main reason for hardness decrease in HAZ. OPEN ACCESSMetals 2015, 5 1705

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Section: Introductionmentioning

confidence: 99%

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

Ramazani

Mukherjee

Abdurakhmanov

et al. 2015

Metals

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“…Conventional transformation-induced plasticity (TRIP) steels with the superior combination of strength and ductility have been widely used for automotive industries which enable to improve passenger safety and to reduce vehicle weight [1][2][3][4][5]. The mechanical property of the steels was resulted from the transformation of retained austenite (RA) to martensite, leading to an increase in the work hardening rate during plastic deformation [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study of the decomposition behavior of retained austenite and the partitioning of alloying elements during tempering in CMnSiAl TRIP steels

et al. 2015

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“…To further analyze stress‐induced by martensite/bainite structure, Kernel average misorientation (KAM) was to study the stress distribution, as shown in Figure . Yellow and red represent stress concentration due to high KAM value, and KAM maps show that the highest value is in the location of martensite/bainite (Figure b, c).…”

Section: Resultsmentioning

confidence: 99%

“…Assuming all data points in the low band contrast peak come from martensite/bainite, [12,13] the fraction of low BC peak gives the volume fraction of martensite phase in this mixed-phase microstructure, which was obtained to be 30%, 63.6%, and 71% in samples 1#, 2#, and 3#, respectively. To further analyze stress-induced by martensite/bainite structure, Kernel average misorientation (KAM) was to study the stress distribution, [14][15][16] as shown in Figure 6. Yellow and red represent stress concentration due to high KAM value, and KAM maps show that the highest value is in the location of martensite/bainite (Figure 6b, c).…”

Section: Microhardness and Local Stress Distribution In The Segregatementioning

confidence: 99%

The Influence of Centerline Segregation on the Mechanical Performance and Microstructure of X70 Pipeline Steel

Guo

Wang

Liu

et al. 2018

steel research int.

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Centerline segregation is an inherent phenomenon during solidification. It is controlled by optimizing the continuous casting process, but is not easy to be avoided. According to the severity of centerline segregation of the slab, it affects the mechanical properties and final microstructure of rolled strip. The objective of this paper is to study the influence of centerline segregation degree on the microstructure and mechanical properties of X70 pipeline steels. In this study, the mechanical properties of strips produced from the slabs are examined and the results show that centerline segregation is some adverse effect on Charpy impact toughness and tensile properties of hot‐rolled strips. The strips from slab with higher degree of segregation, exhibits lower Charpy impact toughness, higher tensile strength, higher microhardness. The segregated degree of slab is studied by using the method of Mannesmann, indicating that it could be up to class 3–4. Moreover, the results from Electron Probe Micro Analyzer (EPMA) shows that high level of Mn content is obtained at the centerline of strips processed from the slab with segregation degree of class 3–4. The corresponding microstructure is identified as lath martensite, which should be contributed to the undesirable mechanical properties.

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Quantification of bake hardening effect in DP600 and TRIP700 steels

Cited by 85 publications

References 34 publications

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

Characterization of Microstructure and Mechanical Properties of Resistance Spot Welded DP600 Steel

Study of the decomposition behavior of retained austenite and the partitioning of alloying elements during tempering in CMnSiAl TRIP steels

The Influence of Centerline Segregation on the Mechanical Performance and Microstructure of X70 Pipeline Steel

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