Multiscale modelling of stress and strain partitioning in high strength dual phase steels

• Autorzy: Asgari A. , Ghadbeigi H. , Pinna C. , Hodgson P.D.

Warianty tytułu

PL

Wieloskalowe modelowanie rozdziału naprężeń i odkształceń w stalach dwufazowych o wysokiej wytrzymałości.

• Języki publikacji: EN

Abstrakty

EN

Multiscale modelling of stress and strain partitioning in DP steel was carried out using both realistic microstructure-based RVE models as well as stochastic microstructures generated by Monte Carlo method. The stochastic microstructure models were shown to resemble that of realistic microstructures, enabling research on the specific aspects of the microstructure that could be difficult to control and study during experimental work. One such feature of the realistic microstructures studied in this work was the grain size and microstructure morphology. The microstructures were generated with varying average grain sizes while all other parameters, such as boundary conditions, material properties and volume fractions of martensite and ferrite were kept constant. It is found that the effect of grain size is much more pronounced during the initial localisation of the plastic deformation at and around the interface of the phases. In addition, the decrease in ductility and increase in strength of the DP steels are directly related to the refinement of grain sizes of each phase and the stress-strain partitioning in between them.

PL

Wieloskalowe modelowanie rozdziału naprężeń i odkształceń w stalach dwufazowych (DP) przeprowadzono wykorzystując zarówno reprezentatywny element objętości (ang. representative volume element RVE) z rzeczywistą mikrostrukturą jak i stochastyczną mikrostrukturę wygenerowaną metodą Monte Carlo. Stochastycznie wygenerowane mikrostruktury przypominały te rzeczywiste, umożliwiając badanie specyficznych cech mikrostruktury trudnych do analizowania metodami doświadczalnymi. Jedną z takich cech była wielkość ziarna i morfologia ziaren. Mikrostruktury wygenerowano stosując różne średnie wielkości ziarna podczas gdy pozostałe parametry, takie jak warunki brzegowe, własności materiału oraz ułamek objętości martenzytu i ferrytu pozostawały niezmienione. W konsekwencji zaobserwowano, że wpływ wielkości ziarna jest bardzie widoczny w czasie inicjalizacji lokalizacji odkształcenia plastycznego oraz wokół powierzchni międzyfazowych. Dodatkowo stwierdzono, że spadek plastyczności i wzrost wytrzymałości stali DP są związane z rozdrobnieniem ziarna każdej z faz oraz z rozdziałem naprężeń i odkształceń między fazami.

Słowa kluczowe

EN

realistic microstructure; RVE; Monte Carlo simulation; grain size; dual phase steel

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2012
• Tom: Vol. 12, No. 3
• Strony: 163--174
• Opis fizyczny: Bibliogr. 33 poz., rys.

Twórcy

autor

Asgari A.

• School Of Engineering, Deakin University, Victoria, 3216, Australia

autor

Ghadbeigi H.

• Department of Mechanical Engineering, The University Of Sheffield, Sheffield S1 3jd, Uk

autor

Pinna C.

• Department of Mechanical Engineering, The University Of Sheffield, Sheffield S1 3jd, Uk

autor

Hodgson P.D.

• Institute For Frontier Materials, Deakin University, Victoria, 3216, Australia

Bibliografia

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