How severe plastic deformation at cryogenic temperature affects strength, fatigue, and impact behaviour of grade 2 titanium

Anibal Mendes, Andrea M Kliauga, Maurizio Ferrante, Vitor L Sordi
2014 IOP Conference Series: Materials Science and Engineering  
Influence of UFG structure formation on mechanical and fatigue properties in Ti-6Al-7Nb alloy V V Polyakova, V N Anumalasetty, I P Semenova et al. -Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP S Fintová and L Kunz -Strength and ductility enhancement in nanostructured AI6063 with a bimodal grain size distribution M Shakoori Oskooie and H Asgharzadeh -This content was downloaded from IP address 207.241.231.81 on 27/07 Abstract. Samples of grade 2 Ti were processed by Equal
more » ... el Angular Pressing (ECAP), either isolated or followed by further deformation by rolling at room temperature and at 170 K. The main interest of the present work was the evaluation of the effect of cryogenic rolling on tensile strength, fatigue limit and Charpy impact absorbed energy. Results show a progressive improvement of strength and endurance limit in the following order: ECAP; ECAP followed by room temperature rolling and ECAP followed by cryogenic rolling. From the examination of the fatigued samples a ductile fracture mode was inferred in all cases; also, the sample processed by cryogenic rolling showed very small and shallow dimples and a small fracture zone, confirming the agency of strength on the fatigue behaviour. The Charpy impact energy followed a similar pattern, with the exception that ECAP produced only a small improvement over the coarse-grained material. Motives for the efficiency of cryogenic deformation by rolling are the reduced grain size and the association of strength and ductility. The production of favourable deformation textures must also be considered.
doi:10.1088/1757-899x/63/1/012161 fatcat:7yu5f4jgd5hx3nipxnjrv3lvoi