Studies on texture and formability of Zircaloy-4 produced by pilgering route

Singh, Swadesh Kumar; Limbadri, K.; Singh, A.K.; Ram, A. Maruthi; Ravindran, Mina; Krishna, Mani; Reddy, M. Chaitanya; Suresh, Kurra; Prasad, K. Sajun; Panda, Sushanta Kumar

doi:10.1016/j.jmrt.2018.11.018

Cited by 14 publications

(1 citation statement)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hardening exponent(n) reflects the strengthening deformation ability and resisting instability of the Zr alloy sheet. The formability of the sheet is closely related to the hardening exponent [35]. Therefore, the hardening exponent (n) is one of the criteria for the formability of sheet.…”

Section: Study On Textures Optimization For Formability Improvement 4...mentioning

confidence: 99%

Study on Formability Improvement of Zr-4 Sheets Based on Texture Optimization

Liu,

Song,

Deng

et al. 2024

Metals

View full text Add to dashboard Cite

A positioning grid is a key clamping structure for fixing the transverse and axial positions of fuel assemblies in nuclear reactors, and it is generally prepared by the transverse stamping of a Zr-4 sheet. However, the texture formed in the processing process of Zr-4 sheets can affect formability, resulting in cracking in the stamping process. Therefore, the relationship between the formability of Zr-4 sheets and the normal Kearns factor (Fn) of basal texture was studied in this paper. The results showed that the Zr-4 sheet with an Fn equaling 0.720, prepared by an isobaric reduction rolling process, would crack in the stamping process. To avoid the cracking during stamping, the formability improvement of Zr-4 sheets based on texture optimization was discussed. By using the finite element model (FEM) and a visco plastic self-consistent (VPSC) model coupled simulation, the relationship between the initial textures and formabilities of Zr-4 sheet is established. It is found that the hardening exponents (n) decreased with increasing Fns in VPSC simulations. Meanwhile, as the Fn increases, cracks are prone to occur at the bottom corner of the stamped sheet in finite element simulation. Given the results from FEM and VPSC simulations, it is proposed that the Fn should be controlled to be less than 0.7 for preventing cracks in the sheet during stamping. Additionally, a new rolling process named non-isobaric reduction rolling was designed in which the Fn of the Zr-4 sheet is successfully reduced to 0.690. The stamping results indicate that the sheet is free of cracks under an Fn of 0.690. Therefore, texture optimization with the proposed rolling process can improve the formability of Zr-4 sheets, which effectively solves the cracking problem of Zr-4 sheets.

show abstract

Section: Study On Textures Optimization For Formability Improvement 4...mentioning

confidence: 99%