A study of local deformation and damage of dual phase steel

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

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

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2014

วารสาร: Materials & Design (0264-1275)

Volume number: 64

หน้าแรก: 729

หน้าสุดท้าย: 742

จำนวนหน้า: 14

นอก: 0264-1275

eISSN: 1873-4197

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908144426&doi=10.1016%2fj.matdes.2014.08.009&partnerID=40&md5=8433a7f730c835cbfd3a30e62d50e43e

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Deformation and fracture behavior of Dual Phase (DP) high strength steel were investigated by means of a microstructure based Finite Element (FE) modeling. 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) taking into account in the RVEs. Principally, the GNDs occurred around phase boundaries during quenching process due to the austenite-martensite transformation. Flow behaviors of individual phases were defined on the basis of dislocation theory and partitioning of local chemical composition. Then, flow curves of the examined DP steel were predicted. Furthermore, the Gurson-Tvergaard-Needleman (GTN) model was used to represent ductile damage evolution in the microstructure. Occurrences of void initiation were characterized and damage parameters for RVE simulations were hence identified. Finally, influences of the GNDs, local stress and strain distributions and interactions between phases on predicted crack initiation in the DP microstructure were discussed and correlated with experimental results. ฉ 2014 Elsevier Ltd.

คำสำคัญ

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