Microstructure, mechanical properties and strengthening mechanisms of 5Cr5MoV modified by aluminum》.pdfVIP

Materials Design 83 (2015) 483–492 Contents lists available at ScienceDirect Materials Design journal homepage: www.else /locate/matdes Microstructure, mechanical properties and strengthening mechanisms of 5Cr5MoV modified by aluminum Sha-Sha Li, Yao-Hui Liu ⇑, Yu-Lai Song, Lingnan Kong, Ren-Hang Zhang, Tuan-Jie Li Key Laboratory of Automobile Materials of Ministry of Education Department of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, PR China a r t i c l e i n f o a b s t r a c t Article history: The influence of aluminum on the microstructure and tensile properties of 5Cr5MoV was systematically Received 2 February 2015 investigated for improving the mechanical properties at room temperature. Microstructure was charac- Revised 10 April 2015 terized by optical microscope (OM), scanning electron microscopy (SEM), field-emission transmission Accepted 3 June 2015 electron microscopy (FE-TEM), and additionally the uniaxial tensile tests were performed on a Available online 19 June 2015 MTS-810 testing system. Tensile strength as a function of aluminum concentration exhibits an obvious two-stage characteristic. In stage I, 5Cr5MoV is continuously strengthened with the increase of alu- Keywords: minum, mainly owing to the refinement of lath martensite, the preci