Effects of structural anisotropy on deformation and damage of a duplex stainless steel under high strain rate loading

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

卷:705

Article

Li, C.^1,2  Huang, J. Y.¹  Tang, X. C.³  Chai, H. W.¹  Xiao, X. H.⁴  Feng, Z. D.¹  Luo, S. N.^1,2 

[1] Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Sichuan, Peoples R China

[3] South China Univ Technol, Dept Engn Mech, Guangzhou 510640, Guangdong, Peoples R China

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

关键词: Duplex stainless steel;    Anisotropy;    Deformation;    Damage evolution;    EBSD;   

DOI  :  10.1016/j.msea.2017.08.091

来源: Elsevier

【 摘 要 】

Duplex stainless steel (DSS) with pronounced microstructural anisotropy, is shock-loaded along normal direction, transverse direction and rolling direction to investigate the effects of structural anisotropy on high strain rate deformation and damage. Hugoniot elastic limit (HEL) and spall strength are obtained from free surface velocity histories. The recovered samples are characterized with electron backscatter diffraction and x-ray computed tomography. HEL shows negligible anisotropy and is dominated by the weaker austenite phase. Spall strength shows anisotropy for incipient spallation but not for full spallation. Plastic deformation and damage depend on the mismatch in sound speed and strength between ferrite and austenite. Damage nucleates at phase boundaries, and propagates as cleavage cracks in the textured ferrite; the propagation is blocked by austenite. These factors coupled with different stress states induced by different impact velocities contribute to DSS's anisotropic or isotropic response.

【 授权许可】

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