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Title: Microstructure and Texture Evolutions in AISI 1050 Steel by Flow Forming

Hot rolled and annealed AISI 1050 steel cylindrical coupons were flow formed at different levels of deformation (66% and 90% wall thickness reduction). TEM studies revealed development of ultra fine (sub) grain cell structure due to severe plastic deformation. The transverse subgrain size changed from 10 m (beginning) to 300nm (66% deformation) to 40nm (90% deformation). EBSD study revealed decreased recrystallization fraction at 90% deformation compared with 66% deformation due to orientation pinning from preferred orientation along {002} planes. No evidence of dislocation pinning or cracking was observed on any samples. The aim of the present work is to study the deformation behaviour and microstructural evolution during conventional flow forming process. The study also sheds light on the strengthening behaviour and structural changes during severe straining.
 [1] ;  [2] ;  [2] ;  [3]
  1. Timken Technology Center, Canton, OH
  2. Ohio State University, Columbus
  3. ORNL
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Resource Relation:
Conference: 11th International Conference on Technology of Plasticity, ICTP 2014, Nagoya, Japan, 20141019, 20141024
Research Org:
Oak Ridge National Laboratory (ORNL); High Temperature Materials Laboratory (HTML)
Sponsoring Org:
EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
Country of Publication:
United States
Flow Forming; Dynamic Recrystallization; Texture; Preferred Orientation; Nanostructure