The dependence of near-threshold fatigue crack growth on microstructure and environment in dual-phase steels

Chen, D.L.; Wang, Z.G.; Jiang, Xiaoxia; Ai, S. H.; Shih, C.H.

doi:10.1016/0921-5093(89)90415-2

Cited by 33 publications

(12 citation statements)

References 39 publications

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“…In this regard, dual-phase (DP) steel has already gained its popularity as this type of steel has a good combination of higher tensile strength along with significant ductility. The microstructural matrix of DP steel consists of mostly martensitic islands on the ferrite matrix with or without potential bainite and a small amount of retained austenite (Ref [1][2][3][4][5]. The ductility of the steel arises from the relatively soft ferrite, and the harder martensite accounts for the strength.…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints

Farabi

Chen

Zhou

2011

J. of Materi Eng and Perform

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The aim of this investigation was to evaluate the microstructural change after laser welding and its effect on the tensile properties and strain hardening behavior of DP600 and DP980 dual-phase steels. Laser welding led to the formation of martensite and significant hardness rise in the fusion zone because of the fast cooling, but the presence of a soft zone in the heat-affected zone was caused by partial vanishing and tempering of the pre-existing martensite. The extent of softening was much larger in the DP980-welded joints than in the DP600-welded joints. Despite the reduction in ductility, the ultimate tensile strength (UTS) remained almost unchanged, and the yield strength (YS) indeed increased stemming from the appearance of yield point phenomena after welding in the DP600 steel. The DP980-welded joints showed lower YS and UTS than the base metal owing to the appearance of severe soft zone. The YS, UTS, and strain hardening exponent increased slightly with increasing strain rate. While the base metals had multi-stage strain hardening, the welded joints showed only stage III hardening. All the welded joints failed in the soft zone, and the fracture surfaces exhibited characteristic dimple fracture.

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Section: Introductionmentioning

confidence: 99%

Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints

Farabi

Chen

Zhou

2011

J. of Materi Eng and Perform

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“…Crack deflections in the ferrite, ferrite grain boundaries, and ferrite/martensite interfaces result in crack closure effects ( . Although fatigue properties of DP steels have been investigated for many years (Ref [11][12][13][14][15][16], the effects of dynamic strain aging (DSA) on fatigue properties of DP steels with different martensite morphology have not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Dynamic Strain Aging on Subsequent Mechanical Properties of Dual-Phase Steels

Molaei

Ekrami

2009

J. of Materi Eng and Perform

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Dual-phase (DP) steels with different martensite contents were produced by subjecting a low carbon steel to various heat treatment cycles. In order to investigate the effect of dynamic strain aging (DSA) on mechanical properties, tensile specimens were deformed 3% at 300°C. Room temperature tensile tests of specimens which deformed at 300°C showed that both yield and ultimate tensile strengths increased, while total elongation decreased. The fatigue limit increased after pre-strain in the DSA temperature range. The effects of martensite volume fraction on mechanical properties were discussed.

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“…DP steel consists of a soft ferrite matrix with finely dispersed martensite islands [15,[26][27][28][29]. Martensite provides high strength while ferrite is responsible for plasticity [23,30,31]. In general, the microstructure is very fine and combines both deep-drawing capacity and high strength.…”

Section: Introductionmentioning

confidence: 99%

Critical Assessment of Techniques for the Description of the Phase Composition of Advanced High-Strength Steels

et al. 2019

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The phase composition and portion of individual phases in advanced high-strength steels (AHSS) CP1000 and DP1000 was studied by complementary microscopic and diffraction techniques. CP1000 and DP1000 steel grades have a high strength-to-density ratio and they are used in many applications in the automotive industry. The microstructure of the CP1000 “complex phase” steel consists of ferrite, bainite, martensite and a small amount of retained austenite. DP1000 is a dual phase steel, which has a structure of a ferritic matrix with islands of martensite and a minor amount of retained austenite. The influence of selected etchants (Nital, LePera, Beraha I, Nital followed by metabisulfite, Nital followed by LePera, and Nital followed by Beraha I) on the microstructure image is described. X-ray diffraction, neutron diffraction and light optical, scanning and transmission electron microscopy were used in this work for advanced characterization of the microstructure and phase composition. The information provided by each technique is critically compared.

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The dependence of near-threshold fatigue crack growth on microstructure and environment in dual-phase steels

Cited by 33 publications

References 39 publications

Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints

Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-Phase Steel Joints

The Effect of Dynamic Strain Aging on Subsequent Mechanical Properties of Dual-Phase Steels

Critical Assessment of Techniques for the Description of the Phase Composition of Advanced High-Strength Steels

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