Microstructure based flow curve modeling of high-Mn steels with TWIP and TRIP effect

• Autorzy: Twardowski R. , Prahl U.

Warianty tytułu

PL

Uwzględnienie mikrostruktury w modelowaniu krzywych płynięcia wysoko-manganowych stali z efektem TWIP i TRIP

• Języki publikacji: EN

Abstrakty

EN

In the present work a microstructural model based on representative volume elements (RVE) is proposed for high manganese steels with TWIP and TRIP effect. The polycrystalline structure is generated by spatial discretization of the RVE in three-dimensional Voronoi tessellations. For the hardening behavior a constitutive material model is used based on the evolution of dislocation, twin and epsilon-martensite density. The plastic deformation is investigated numerically using periodic displacement boundary conditions. In addition to the parameters of temperature and microstructure the influence of the chemical heterogeneity is investigated. The experimental verification of the numerical results is done by uniaxial tensile tests on flat tensile speciems.

W pracy zaproponowano model krzywych płynięcia stali z efektem TWIP i TRIP, wykorzystujący ideę reprezentatywnego elementu objętości (ang. representative volume element -RVE). Strukturę polikryształu wygenerowano poprzez dyskretyzacją przestrzeni z zastosowanie wieloboków Voronoi. Do opisu umocnienia materiału wykorzystano model wykorzystujący ewolucję populacji dyslokacji, bliźniakowanie oraz gęstość martenzytu epsilon. Odkształcenie plastyczne analizowano numerycznie stosując okresowe warunki brzegowe w RVE. Oprócz uwzględnienia wpływu temperatury i prędkości odkształcenia rozważono też wpływ nierównomierności składu chemicznego. Weryfikację doświadczalną modelu przeprowadzono dla próby jednoosiowego rozciągania próbek płaskich.

Słowa kluczowe

EN

high manganese steels; microstructure; representative volume element; twinning; phase transformation

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2012
• Tom: Vol. 12, No. 3
• Strony: 130--136
• Opis fizyczny: Bibliogr. 22 poz., rys.

Twórcy

autor

Twardowski R.

• IEHK RWTH Aachen, Intzestrasse 1, 52071 Aachen

autor

Prahl U.

• IEHK RWTH Aachen, Intzestrasse 1, 52071 Aachen

Bibliografia

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