INVESTIGATION OF MICROSTRUCTURAL FEATURES ON DAMAGE ANISOTROPY

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

In the recent years, dual phase steel sheets have been used extensively in automotive industry in order to reduce the total weight of the vehicle without sacrificing from mechanical properties. The microstructural morphology of industrially relevant ferritic-martensitic dual phase steels consists of altering
bands of ferrite and martensite which causes anisotropic and highly localized strain distributions. The effect of banded morphology on active damage mechanisms and damage evolution is studied by tensile tests along rolling and transverse directions. Tensile tests are carried out until preselected points of the stress strain curve and metallographic investigation is executed from the deformed samples. An automated Matlab© code is used in order to quantify the images in terms of void size, distribution. Three different damage mechanisms have been observed; void formation between ferrite-martensite interface, around unwanted inclusions and cracking of martensite in addition voids are heterogeneously distributed through the thickness direction of the samples.
Further, strain gradient enhanced rate independent crystal plasticity simulations were conducted on idealized hexagonal microstructures with a pre-existing void under different stress states and grain orientations. It is shown that void evolution as well as stress field are highly dependent on loading conditions and grain orientations.
Original languageEnglish
Title of host publication11th Forming Technology Forum 2018
Place of Publication Zurich, Switzerland
PublisherIVP - ETH Zurich
Pages71-71
Number of pages7
Publication statusPublished - Jul 2018

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Martensite
Anisotropy
Ferrite
Steel sheet
Stress-strain curves
Automotive industry
Plasticity
Mechanical properties
Crystals
Microstructure
Steel

Keywords

  • Dual phase steel
  • damage evolution
  • anisotropy
  • failure mechanisms

Cite this

Asik, E. E., Perdahcioglu, E. S., & van den Boogaard, A. H. (2018). INVESTIGATION OF MICROSTRUCTURAL FEATURES ON DAMAGE ANISOTROPY. In 11th Forming Technology Forum 2018 (pp. 71-71). Zurich, Switzerland: IVP - ETH Zurich.
Asik, Emin Erkan ; Perdahcioglu, Emin Semih ; van den Boogaard, Antonius H. / INVESTIGATION OF MICROSTRUCTURAL FEATURES ON DAMAGE ANISOTROPY. 11th Forming Technology Forum 2018. Zurich, Switzerland : IVP - ETH Zurich, 2018. pp. 71-71
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Asik, EE, Perdahcioglu, ES & van den Boogaard, AH 2018, INVESTIGATION OF MICROSTRUCTURAL FEATURES ON DAMAGE ANISOTROPY. in 11th Forming Technology Forum 2018. IVP - ETH Zurich, Zurich, Switzerland, pp. 71-71.

INVESTIGATION OF MICROSTRUCTURAL FEATURES ON DAMAGE ANISOTROPY. / Asik, Emin Erkan; Perdahcioglu, Emin Semih; van den Boogaard, Antonius H.

11th Forming Technology Forum 2018. Zurich, Switzerland : IVP - ETH Zurich, 2018. p. 71-71.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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N2 - In the recent years, dual phase steel sheets have been used extensively in automotive industry in order to reduce the total weight of the vehicle without sacrificing from mechanical properties. The microstructural morphology of industrially relevant ferritic-martensitic dual phase steels consists of alteringbands of ferrite and martensite which causes anisotropic and highly localized strain distributions. The effect of banded morphology on active damage mechanisms and damage evolution is studied by tensile tests along rolling and transverse directions. Tensile tests are carried out until preselected points of the stress strain curve and metallographic investigation is executed from the deformed samples. An automated Matlab© code is used in order to quantify the images in terms of void size, distribution. Three different damage mechanisms have been observed; void formation between ferrite-martensite interface, around unwanted inclusions and cracking of martensite in addition voids are heterogeneously distributed through the thickness direction of the samples.Further, strain gradient enhanced rate independent crystal plasticity simulations were conducted on idealized hexagonal microstructures with a pre-existing void under different stress states and grain orientations. It is shown that void evolution as well as stress field are highly dependent on loading conditions and grain orientations.

AB - In the recent years, dual phase steel sheets have been used extensively in automotive industry in order to reduce the total weight of the vehicle without sacrificing from mechanical properties. The microstructural morphology of industrially relevant ferritic-martensitic dual phase steels consists of alteringbands of ferrite and martensite which causes anisotropic and highly localized strain distributions. The effect of banded morphology on active damage mechanisms and damage evolution is studied by tensile tests along rolling and transverse directions. Tensile tests are carried out until preselected points of the stress strain curve and metallographic investigation is executed from the deformed samples. An automated Matlab© code is used in order to quantify the images in terms of void size, distribution. Three different damage mechanisms have been observed; void formation between ferrite-martensite interface, around unwanted inclusions and cracking of martensite in addition voids are heterogeneously distributed through the thickness direction of the samples.Further, strain gradient enhanced rate independent crystal plasticity simulations were conducted on idealized hexagonal microstructures with a pre-existing void under different stress states and grain orientations. It is shown that void evolution as well as stress field are highly dependent on loading conditions and grain orientations.

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Asik EE, Perdahcioglu ES, van den Boogaard AH. INVESTIGATION OF MICROSTRUCTURAL FEATURES ON DAMAGE ANISOTROPY. In 11th Forming Technology Forum 2018. Zurich, Switzerland: IVP - ETH Zurich. 2018. p. 71-71