Flow Stress Behavior, Constitutive Modeling, and Microstructural Characteristics of DP 590 Steel at Elevated Temperatures

Pandre, Sandeep; Kotkunde, Nitin; Takalkar, Prathamesh; Morchhale, Ayush; Sujith, R. I.; Singh, Swadesh Kumar

doi:10.1007/s11665-019-04497-y

Cited by 34 publications

(9 citation statements)

References 33 publications

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“…The rate of the diffusion of solute atoms can be faster than the movement of dislocations during deformation and continuously block their movements [15]. In order to continue deformation, the dislocations have to cut through these solute atoms throughout the deformation which result in higher stresses, disrupted deformation, serrations in the flow curves and significantly lower total strains [27]. In Figures 3 and 4, the traces of DSA phenomenon can be observed for both steel grades at 175°C and 275°C.…”

Section: Resultsmentioning

confidence: 99%

Detailed deformation behaviour analysis of DP steels at warm forming temperatures via warm tensile tests

Şen

Civek

2022

Ironmaking & Steelmaking

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DP advanced high strength steels (AHSSs) have an important place in automotive industry for producing parts like B-pillars, door rings, etc. However, the excellent strength of AHSSs increases the issues related to their formability. Therefore, it is necessary to implement new forming processes to fully utilize the excellent properties of DP steels in more complex parts. In this study, the formability of DP steels (DP600, DP800) and their deformation behaviour at warm forming temperatures have been investigated by a series of tensile tests conducted at elevated temperatures (75, 175, 275, 375°C) and two different strain rates (0.05, 0.005 s -1 ). To understand the deformation behaviour thoroughly, both instantaneous and average strain hardeningn and strain rate sensitivitym values, the change in the hardening capacity and the microstructure have been analyzed. The results have shown that the formability of DP steels at 375°C is more favourable as compared at room temperature.

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Section: Resultsmentioning

confidence: 99%

Detailed deformation behaviour analysis of DP steels at warm forming temperatures via warm tensile tests

Şen

Civek

2022

Ironmaking & Steelmaking

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“…The different material properties are calculated from the stress-strain curves based on the procedure reported by. 22 The calculated properties are plotted with respect to temperature as shown in Figure 2(b), and also listed in the Table 2. It can be observed that the ultimate tensile strength (UTS) and yield strength (YS) are found to be decreased with rise in the test temperature till 300°C and after that it has shown a drastic improvement due to the strain hardening effect.…”

Section: Resultsmentioning

confidence: 99%

A study on tensile flow and strain hardening behaviour of β-Titanium at elevated temperatures

Pandre

Suresh

Singh³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this paper, the tensile flow and work hardening behaviour of Beta titanium alloy was examined over a wide temperature range of 28 to 500°C. The work hardening of the material was modelled using different empirical relations such as Swift, Voce and Ludwigsen and the prediction accuracy of these models were compared with different statistical parameters. The hardening rate of the material was analysed with K-M analysis. The fracture behaviour of the tensile samples was studied using SEM results. The yield strength and ultimate tensile strength of the material was found to be decreased from room temperature to 200°C followed by a gradual increase with increase in temperature. Uniformly distributed serrations were observed in the entire plastic region of the flow curve in the temperature range of 200– 400°C. This serrated behaviour could be due to the manifestation of dynamic strain aging in this temperature range. The Voce hardening model was identified as a best hardening model to describe the material hardening. SEM results revealed the ductile mode of fracture at all temperature with large number of dimples in fractographs.

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“…Dual Phase (DP) steel is one of the grades of AHSS and is immensely used for automotive applications for the construction of structures and other parts due to its exceptional combination of mechanical properties like strength, formability, improved crash resistance and fuel economy. 2 Despite of many advantages of high strength DP steel, it has limited formability at room temperature (RT). To overcome this limitation of forming complex shapes at RT, many researchers have proposed high temperature forming which helps in the easy flow of material during the forming operation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of forming characteristics for dual phase steel under warm incremental forming process

Pandre

Gandla²,

Kotkunde

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The demand for rapid prototyping techniques has been increasing in the field of automotive for the manufacturing of various parts with dissimilar shapes. In the present work, experimental and numerical investigations have been performed on an automotive-grade DP steel using an incremental sheet forming process at Room Temperature (RT) and 400°C. Various formability parameters such as fracture forming limits, limiting wall angle, forming forces, thickness distribution, and geometrical accuracy have been analysed. The fracture limits of the material are evaluated by forming varying wall angled conical (VWACF), and pyramidal (VWAPF) frustums. The fracture limits of the material formed at 400°C have been found to be 14.06% higher compared to room temperature fracture limits. The limiting wall angles for VWACF and VWAPF are found to be 70.73° ± 1.41° and 67.97° ± 1.35°, which are also higher than the formed constant wall angled frustum. The forming forces measured from experimental and FE simulations are in good agreement with the predicted forming forces from Arene’s equation. The minimum thickness obtained from experimental and FE simulations are in good agreement with each other with an absolute error of less than 4.5% and 7% for VWACF and VWAPF.

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Flow Stress Behavior, Constitutive Modeling, and Microstructural Characteristics of DP 590 Steel at Elevated Temperatures

Cited by 34 publications

References 33 publications

Detailed deformation behaviour analysis of DP steels at warm forming temperatures via warm tensile tests

Detailed deformation behaviour analysis of DP steels at warm forming temperatures via warm tensile tests

A study on tensile flow and strain hardening behaviour of β-Titanium at elevated temperatures

Analysis of forming characteristics for dual phase steel under warm incremental forming process

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