Ferrite phase transformation in dual-phase steel under shock loading

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:802

Article

Ameri, Ali¹  Wang, Hongxu¹  Li, Zongjun¹  Quadir, Zakaria²  Rickard, William D. A.²  Gonzalez, Manny³  Hazell, Paul J.¹  Escobedo-Diaz, Juan P.¹ 

[1] Univ New South Wales, Sch Engn & Informat Technol, Canberra, ACT 2600, Australia

[2] Curtin Univ, John de Laeter Ctr JdLC, Microscopy & Microanal Facil MMF, Perth, WA 6102, Australia

[3] Air Force Res Lab, Dayton, OH 45433 USA

关键词: Ferrite;    Dual phase steel;    Martensite;    Phase transformation;    Twinning;   

DOI  :  10.1016/j.msea.2020.140690

来源: Elsevier

【 摘 要 】

Microstructural changes and ferrite phase transformation under shock loading, between 8.5 GPa and 17.5 GPa, in a hot-rolled Lean Duplex Stainless Steel (commercially known as LDX 2101) were investigated in as-received and pre-deformed conditions. The latter condition was considered to distinguish classical deformation twins at high strain rates from those associated to the reversible ferrite phase transformation. Plate impact experiments were used to introduce compressive shock loading at peak stresses below and above the stress threshold of the ferrite phase transformation, 13 GPa. Effects of shock loading were also examined by compressing shocked samples quasi-statically and comparing their response with those tested in the as-received condition. The microstructural examinations revealed that the ferrite in LDX 2101 experienced a reversible phase transformation at a peak stress of similar to 17 GPa. The fingerprints for this transformation were {112} < 111 > primary twins and {332}< 113 > primary and secondary twins. In addition, the yield stress of the sample pre-shocked at similar to 17 GPa showed a considerable increase (similar to 150 MPa) compared to the flow stress in as-received conditions.

【 授权许可】

Free