Steel and Iron Based Alloys

Ramazani, Ali; Berme, Banu; Prahl, Ulrich

doi:10.1002/9783527649846.ch1

Cited by 7 publications

(1 citation statement)

References 53 publications

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“…Since DP steels offer an outstanding combination of strength and ductility due to their microstructure, in which a hard martensitic phase is dispersed in a soft ferrite phase, these steel grades are demanded extensively for the automotive industry [1][2][3]. Based on many researchers' reports dual-phase steels fail in a ductile manner [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Failure Initiation in Dual-Phase Steel

Ramazani

Schwedt

Aretz

et al. 2013

KEM

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This research work aims to model the failure initiation in dual-phase (DP) steel. A microstructure based approach by means of representative volume elements (RVE) is employed to evaluate the microstructure deformation and the failure initiation on the mesoscale. In order to determine cohesive parameters for martensite cracking, a two level approach has been performed experimentally. First, in-situ bending test in SEM with EBSD measurements before and after the test showed that the crack initiation occurs in martensite islands. Then, mini tensile tests with DIC technique were carried out to identify macroscopic failure initiation strain values. RVE modeling combined with extended finite element method (XFEM) was utilized to model martensite cracking on mesoscale. The identified parameters were validated by comparing the predictions with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Failure Initiation in Dual-Phase Steel

Ramazani

Schwedt

Aretz

et al. 2013

KEM

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Characterization and Modeling of Failure Initiation in Bainite‐Aided DP Steel

2014

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This research work aims to characterize and model the failure initiation in bainite-aided dual-phase (DP) steel. Combined electron backscatter diffraction (EBSD) and electron probe microanalysis (EPMA) measurements were applied to quantify the constituents (ferrite, martensite, and bainite) in the microstructure. Mini tensile test with digital image correlation (DIC) analysis was carried out and linked to local scanning electron microscopy (SEM) analysis to identify macroscopic failure initiation strain values. SEM measurements showed that the crack initiation occurs in martensite islands. A microstructure-based approach by means of representative volume elements (RVE) modeling combined with extended finite element method (XFEM) was utilized to model martensite cracking on mesoscale. The identified parameters were validated by comparing the predictions with the experimental results.

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The Effect of Bake-Hardening Parameters on the Mechanical Properties of Dual-Phase Steels

Ramazani

Bruehl

Abbasi

et al. 2016

steel research int.

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Dual-phase (DP) steels offer an outstanding combination of strength and formability as a result of their microstructure, in which a hard martensitic or bainitic phase is dispersed in a soft ferritic matrix. DP steels have a high ultimate tensile strength combined with a low initial yielding stress. The yield strength of DP steels is further increased by the paint baking, also called bake hardening (BH), process. In the current research, the effect of BH parameters, namely pre-strain, baking temperature, and holding time, on yield strength increment of DP steels with different martensite volume fractions is investigated. DP steels with 20 and 30% martensite volume fraction are pre-strained up to 5%, then they are baked at 100, 170, and 300 8C for various times. The results show that maximum yield strength is obtained as optimum values of BH parameters are applied. It is also found that at high values of baking temperature and holding time, martensite tempering effects prevail and yield strength increment decreases. The results also indicate that the increment of pre-strain enhances the Lüders band and decreases the yield strength increment.

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Steel and Iron Based Alloys

Cited by 7 publications

References 53 publications

Failure Initiation in Dual-Phase Steel

Failure Initiation in Dual-Phase Steel

Characterization and Modeling of Failure Initiation in Bainite‐Aided DP Steel

The Effect of Bake-Hardening Parameters on the Mechanical Properties of Dual-Phase Steels

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