New insights into martensite strength and the damage behaviour of dual phase steels

Scott, Colin; Amirkhiz, Babak Shalchi; Pushkareva, Irina; Fazeli, Fateh; Allain, Sébastien; Azizi, Hamid

doi:10.1016/j.actamat.2018.08.010

Cited by 42 publications

(22 citation statements)

References 37 publications

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“…Notably, the carbon densities on the martensite were reported in DP steels, particularly around the interfaces. 21) Secondly, the nano-hardness scattering in area β is discussed. For indent I3, it is evident from Fig.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Nano-hardness Distribution Near the Ferrite-martensite Interface in a Dual Phase Steel with Factorization of Its Scattering Behavior

et al. 2021

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Section: Discussionmentioning

confidence: 99%

Analysis of Nano-hardness Distribution Near the Ferrite-martensite Interface in a Dual Phase Steel with Factorization of Its Scattering Behavior

et al. 2021

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“…On the other hand, the features of their mechanical behavior (such as distribution of stresses/strains between microconstituents) during plastic deformation, work hardening, shear banding, local crack initiation and growth, etc. have also been thoroughly investigated on both macro-and micro-scale, via experiments and simulation [20][21][22][23][24][25][26][27]. Impact resistance is one of the most important properties of AHSS for automotive applications.…”

Section: Impact Resistancementioning

confidence: 99%

Adiabatic heating and energy absorption capability of an advanced high strength steel during drop weight impact testing

Xia

Palomar

Sabirov

2020

Materials Science and Engineering: A

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The manuscript focuses on the energy absorption capability of an advanced high strength steel during drop weight impact testing. The in-situ measurements of temperature during impact resistance testing of samples revealed intensive adiabatic heating effect with the peak temperature of 225 ℃ at the top of the dome resulting in the local softening effect. The drop weight impact resistance of the material under present testing condition is 90 J. Microstructural characterization demonstrated that dislocation glide and formation of substructure is the main deformation mechanism. Analysis of fracture surface of cracked samples (tested with the impact energy of > 90 J) revealed ductile failure mode. The energy required for formation of fracture surface was calculated by quantitative analysis of the 3D digital models generated using microscopy images of the fracture surface taken from different angles. This energy is negligibly lower compared to the total energy spent for plastic deformation of the material.

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“…The authors attributed the spread in the yield strengths to the heterogeneous carbon distribution within martensite and this has been shown qualitatively to exist by atom probe tomography [4,27,30]. Whilst this "continuous composite approach" (CCA) is able to describe the tensile and Bauschinger behaviour of as-quenched martensite, nanoindentation experiments designed to probe the distribution in local yield strengths, have found it difficult to rationalise the large variation required in the models to reproduce the flow results [27,[31][32][33]. Allain and co-workers have found the experimental variation in nanohardness to be ~25% of the spread required in the model [33].…”

Section: Introductionmentioning

confidence: 99%

“…Whilst this "continuous composite approach" (CCA) is able to describe the tensile and Bauschinger behaviour of as-quenched martensite, nanoindentation experiments designed to probe the distribution in local yield strengths, have found it difficult to rationalise the large variation required in the models to reproduce the flow results [27,[31][32][33]. Allain and co-workers have found the experimental variation in nanohardness to be ~25% of the spread required in the model [33]. This is one of the weaknesses of the CCA.…”

Section: Introductionmentioning

confidence: 99%

Strain hardening behaviour of as-quenched and tempered martensite

Wang

Sun

et al. 2020

Acta Materialia

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Martensite is a key constituent in advanced high strength steels and plays an important role in providing the high strength. While the strength of martensite has been extensively studied in the past, its low elastic limit and extremely high strain hardening rate remain a puzzle for the steel community. Composite models proposed recently can successfully reproduce these features as result of gradual yielding of microstructural constituents with either variations in intrinsic yield strengths or transformation induced residual stresses. Although these composite models can explain certain observations associated with the deformation of as-quenched martensite, neither can self-consistently describe all the key characteristics in the tension-compression behaviour of asquenched martensite. Attempts to extend these composite models to tempered martensite have been limited.In this contribution, we conduct a systematic experimental study on the strain hardening of as-quenched and tempered martensite with mechanical testing (e.g. monotonic tension and tension-compression) and interrupted X-ray diffraction. It is shown that the high strain hardening rate, large Bauschinger effect and diffraction line narrowing found in as-quenched martensite during straining can be sustained in tempered martensite tempered up to 400°C. These phenomena can be understood by considering martensite as a multi-constituent composite having both variations in intrinsic yield strengths and relaxation of transformation induced residual stresses during straining.

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New insights into martensite strength and the damage behaviour of dual phase steels

Cited by 42 publications

References 37 publications

Analysis of Nano-hardness Distribution Near the Ferrite-martensite Interface in a Dual Phase Steel with Factorization of Its Scattering Behavior

Analysis of Nano-hardness Distribution Near the Ferrite-martensite Interface in a Dual Phase Steel with Factorization of Its Scattering Behavior

Adiabatic heating and energy absorption capability of an advanced high strength steel during drop weight impact testing

Strain hardening behaviour of as-quenched and tempered martensite

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