Effect of Structure on Mechanical Properties of Dual-Phase Steels

Fonstein, Nina

doi:10.1007/978-3-319-19165-2_3

Cited by 8 publications

(8 citation statements)

References 61 publications

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“…The carbon content in austenite plays a key role in austenite stability, dependant on the volume fraction of austenite in the microstructure and the total carbon content of the alloy. For a given steel composition, the lower the heating temperature in the intercritical region, the higher the carbon content in austenite which therefore leads to lower cooling rate requirements for the martensitic transformation of the austenite phase [26].…”

Section: Resultsmentioning

confidence: 99%

Effect of intercritical annealing on the mechanical properties of dual-phase steel

Ayres

Penney

Evans

et al. 2022

Ironmaking & Steelmaking

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A dual-phase steel chemistry has been processed with varying intercritical annealing temperatures and the properties investigated. It was found that increasing the temperature in the intercritical region led to an increase in the volume fraction (52%-65%) and grain size (1.8-3.3 µm) of martensite whilst the volume fraction and grain size of ferrite decreased. The highest tensile strengths were found at low intercritical temperatures, achieving 935 MPa whilst the highest elongation values of 21% were achieved at the highest intercritical temperatures.

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Section: Resultsmentioning

confidence: 99%

Effect of intercritical annealing on the mechanical properties of dual-phase steel

Ayres

Penney

Evans

et al. 2022

Ironmaking & Steelmaking

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“…45,46 This effect is attributed to the fact that by increasing the intercritical heat treatment temperature in steel with a chemical composition fixed, the martensite, although more brittle and harder than ferrite, increases its toughness as a result of reducing its carbon content. 3,46 Although K IC is a parameter used in the literature to indicate the fracture toughness under linear elastic conditions 22,28,47 , it is expected to find in the literature the fracture toughness for elastoplastic materials in terms of K IC (See Table 3).…”

Section: Crack and Microstructure Interactionmentioning

confidence: 99%

“…Different studies have shown that increased intercritical heat treatment temperatures have two main effects on the martensite properties: They increase the volume fraction and enhance its ductility. 3,4 Different researchers have also reported that DP steel exhibits the best mechanical properties, between 20% and 40% martensite content. 5,6 In addition, an interesting set of characteristics such as low yield point, high ultimate tensile strength, strain hardening, good fatigue resistance, and good weldability have allowed DP steel implementation to be widely extended in different structural applications.…”

Section: Introductionmentioning

confidence: 99%

“…The resulting microstructure consists of a ferrite matrix with dispersed martensite grains. Different studies have shown that increased intercritical heat treatment temperatures have two main effects on the martensite properties: They increase the volume fraction and enhance its ductility 3,4 . Different researchers have also reported that DP steel exhibits the best mechanical properties, between 20% and 40% martensite content 5,6 .…”

Section: Introductionmentioning

confidence: 99%

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Martensite content effect on fatigue crack growth and fracture energy in dual‐phase steels

Avendaño‐Rodríguez,

Rodriguez‐Baracaldo,

Weber

et al. 2023

Fatigue Fract Eng Mat Struct

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The effect of different microstructural factors on crack growth and fatigue fracture mechanisms in dual‐phase (DP) steels has yet to be fully understood. The present research examines the relationship between crack growth, microstructure, and fracture mechanisms. The samples were intercritically annealed at different temperatures to produce three different martensite volume fractions (MVFs). The results show that the mechanical incompatibility of ferrite and martensite promotes continuous crack tip deflection. MVF increases are associated with elevated fracture tortuosity, more significant fracture energy surface formation, and higher Paris law exponent m values. The interaction of the microstructure with the crack tip, the strain energy density, and the softening caused by secondary microcrack propagation are all illustrated by Electron backscatter diffraction (EBSD) maps. Increasing MVF promotes slow crack growth and a fracture energy increase of 22.9% between the as‐received and heat‐treated steels.

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“…Dual-phase (DP) steels are the most used materials in today’s automotive industry, nearly 50% of the vehicle’s structural parts comprise of DP steels (Fonstein, 2016). Increasing use of DP steels has promoted studies to understand the deformation behavior of these steels during the forming process (Ghadbeigi et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

Excessive damage increase in dual phase steels under high strain rates and temperatures

Çobanoğlu

Ertan

Şimşir

et al. 2020

International Journal of Damage Mechanics

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Damage formation in dual phase steels is a complex process and it may be sensitive to the deformation conditions and mechanisms. In this study, the damage parameter is measured and compared under quasi-static and industrial forming conditions (temperatures: 25 vs 200, 300°C and strain rates: 10−3 vs 10 s−1) for DP590 and DP800 steels. Resonance frequency and ultrasonic sound velocity techniques are utilized for the measurements to test the effectiveness and validity of each technique. At a given strain, the damage values can be up to 700% higher at industrial forming conditions, under which dynamic strain aging (DSA) controls the deformation behavior. DSA results in lower formability and is the likely mechanism responsible from the abnormal damage evolution. Measured damage parameters are also confirmed with the void fraction characterization by microscopy, which also provided details on the void shape and distribution with respect to the deformation conditions.

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Effect of Structure on Mechanical Properties of Dual-Phase Steels

Cited by 8 publications

References 61 publications

Effect of intercritical annealing on the mechanical properties of dual-phase steel

Effect of intercritical annealing on the mechanical properties of dual-phase steel

Martensite content effect on fatigue crack growth and fracture energy in dual‐phase steels

Excessive damage increase in dual phase steels under high strain rates and temperatures

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