Microstructure based description of deformation behavior of dual phase steel sheets

Conference proceedings article

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Sirinakorn T., Uthaisangsuk V., Srimanosawapal S.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2014

Volume number: 81

หน้าแรก: 1366

หน้าสุดท้าย: 1371

จำนวนหน้า: 6

นอก: 1877-7058

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84949122919&doi=10.1016%2fj.proeng.2014.10.158&partnerID=40&md5=4d3a0c1ad5cc25d0831383fff4805a0a

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Dual Phase (DP) steels are Advanced High Strength (AHS) steels that have been widely used in the automotive industries. Generally, DP steels exhibit high strength as well as good formability. Their microstructures consist of hard martensitic islands embedded in soft ferritic matrix. Formability description of this steel grade is challenged, as its damage mechanism was very complex on the micro-scale. The aim of this work was to investigate deformation and fracture behavior of the DP steel grade 1000 by means of a microstructure based Finite Element modelling. Representative Volume Elements (RVEs) were applied to consider effects of various microstructure constituents and characteristics. Individual stress-strain curves were provided for ferrite, martensite as well as transformation induced Geometrically Necessary Dislocations (GNDs) including in the RVEs. The flow curves were based on dislocation theory and partitioning of local chemical composition. Furthermore, the Gurson- Tvergaard-Needleman (GTN) model was used to represent ductile damage evolution in the microstructure. Occurrences of void initiation were observed and damage parameters for RVE simulations were identified. Then, influences of the GNDs, local stress and strain distributions and interactions between phases on crack initiation in the DP microstructure were studied and correlated with experimental results. ฉ 2014 The Authors. Published by Elsevier Ltd.

คำสำคัญ

Dual phase steel, Gurson Tvergaard Needleman damage model, Local crack initiation, Transformation-induced geometrically necessary dislocations