Local microstructural characterization of an aged UR45N rolled steel: Application of the nanogauges grating coupled EBSD technique

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

卷:759

Article

Djouda, Joseph Marae^1,2,3  Panicaud, Benoit¹  Gaslain, Fabrice⁴  Beal, Jerernie²  Madi, Yazid^3,4  Montay, Guillaume¹  Le Joncour, Lea¹  Gardan, Julien³  Recho, Naman³  Crepin, Jerome⁴  Maurer, Thomas² 

[1] Univ Technol Troyes, CNRS, ICD, Lab Syst Mican & Ingn Simultanee,FRE2019,CS 42060, F-10004 Troyes, France

[2] Univ Technol Troyes, CNRS, ICD, Lumiere,Nanomat,Nanotechnol L2n,FRE 2019,CS 42060, F-10004 Troyes, France

[3] EPF Ecole Ingn, ERMESS, 3 Bis Rue Lakanal, F-92330 Sceaux, France

[4] CNRS, UMR 7633, Ctr Mat, BP 87, F-91003 Evry, France

关键词: Dual phase;    Microstructure;    Strains;    Nanoscale and mechanism of deformation;   

DOI  :  10.1016/j.msea.2019.05.059

来源: Elsevier

【 摘 要 】

In the present article, metallic nanoparticles (NPs) used as nanogauges and electron backscattered diffraction (EBSD) are combined to investigate deformation mechanisms of the UR45 N duplex steel. The kinematic fields bring precious details in the evolution of the local deformation of austenitic and ferritic phases. The crystal-lographic information at the initial stage and in the plastic domain is obtained by the EBSD technique. Strain evolutions in each phase are analyzed. The first strain marks appear in austenite just before the elastoplastic transition. Slip and twinning activities in austenite constitute an important part of the work hardening of the material. The slips in ferrite are visible in the plastic domain and present complex geometry. The role of phase boundaries, which act as strain barrier is highlighted. The incompatibilities of deformations between the two phases modify the deformation mechanism of austenite in comparison with a pure austenitic stainless steel as 316 L. Local interactions between phases during the deformation are analyzed. The strong strain heterogeneities in the plastic domain are analyzed in the kinematic fields. Local evolutions of the deformation are also confronted to the macroscopic behavior of the material.

【 授权许可】

Free