Modeling of bake-hardening effect for fine grain bainite-aided dual phase steel

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Ormsuptave N., Uthaisangsuk V.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2017

วารสาร: Materials & Design (0264-1275)

Volume number: 118

หน้าแรก: 314

หน้าสุดท้าย: 329

จำนวนหน้า: 16

นอก: 0264-1275

eISSN: 1873-4197

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85010204745&doi=10.1016%2fj.matdes.2017.01.040&partnerID=40&md5=d534d2dc0cdb1d1e8eb0043e2c1ea68c

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Bake hardening (BH) effects of dual phase (DP) steels with consideration of grain size and bainitic phase were investigated. Basically, after BH process, DP steels exhibited complex microstructure characteristic including Cottrell atmosphere, precipitation in ferrite and tempered martensite. Firstly, severe plastic deformation, namely, constrained groove pressing (CGP) was applied to a ferrite–pearlite low carbon steel for producing fine grain microstructure with submicron size. Subsequently, DP steel and DP steel with bainite were generated by intercritical annealing following by water and oil quenching, respectively. The BH at the temperature of 160 °C for 20 min was performed for steel samples with different microstructures after pre-straining to 2, 6 and 10%. Obviously, fine grain structure and bainite could effectively increase the bake hardenability of the examined steels. Additionally, micromechanics based modeling for describing flow stress behavior of the DP steels after BH was done. Hereby, influences of carbon accumulation, occurred carbides and softened martensite were incorporated. Accordingly, the flow curves of the investigated DP steels before and after BH were fairly predicted by means of representative volume element (RVE) finite element (FE) simulations. The increased yield strengths, BH values and resulting strain hardening curves could be accurately described. © 2017 Elsevier Ltd

คำสำคัญ

Bainite-aided dual phase steel, Micromechanical modeling