Improving hydro-formability of stainless steel tubes by tube channel pressing

7th International Conference on Nanomaterials by Severe Plastic Deformation

Kitano, Y.^1 ; Yuasa, M.^2 ; Miyamoto, H.^2 ; Farshidi, M.H.^3 ; Bagherpour, E.^4

Graduate School of Science and Engineering, Doshisha University, Kyoto, Japan^1

Department of Mechanical Engineering, Doshisha University, Kyoto, Japan^2

Department of Materials Engineering, Ferdowsi University of Mashhad, Razavi Khorasan, Iran^3

Faculty of Metallurgical and Materials Engineering, Semnan University, Semnan, Iran^4

关键词: Circumferential direction;    Deformation microstructure;    randomize;    ridging;    Severe plastic deformations;    Strain-hardening exponent;    Texture and microstructures;    Tube channel pressings;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012007/pdf
DOI  :  10.1088/1757-899X/194/1/012007

来源: IOP

【 摘 要 】

Tube channel pressing (TCP), which is one of the severe plastic deformation (SPD) technologies to refine grain size into submicron size for tubular materials, have been applied to ferritic stainless steel tubes for one pass, in order to alleviate ridging and enhance the hydro-formability. It was found that grain-scale shear bands were introduced by one-pass TCP, and texture and microstructure was successfully modified by promoting recrystallization of deformation microstructure, which is otherwise hard-to-recrystallize, in the post-TCP annealing. Elongation to failure, strain-hardening exponent (n-value) and Lankford values of both longitudinal and circumferential directions increased in comparison to with the tube fabricated by conventional process.