公开(公告)号：US11414721B2

公开(公告)日：2022-08-16

申请号：US16302982

申请日：2017-05-18

Applicant: ARCELORMITTAL

Inventor： Nicolas Charbonnier ,  Gerard Petitgand ,  Sebastien Allain ,  Marie-Christine Theyssier

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C23C2/06 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/40 ,  C22C38/12 ,  C22C38/16 ,  C23C2/12 ,  C22C38/04 ,  C22C38/00 ,  C21D8/04 ,  B32B15/01 ,  C22C38/20 ,  C22C38/24 ,  C22C38/38 ,  C23F17/00

Abstract: A method for the manufacture of a TWIP steel is provided including: (A) feeding of a slab comprising by weight: 0.5

公开(公告)号：US12188102B2

公开(公告)日：2025-01-07

申请号：US16302988

申请日：2017-05-23

Applicant: ARCELORMITTAL

Inventor： Jean-Christophe Hell ,  Nicolas Charbonnier ,  Thierry Iung ,  Blandine Remy

IPC: C22C30/00 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/18 ,  C22C38/22 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/58

Abstract: A method for manufacturing a recovered steel sheet having an austenitic matrix presenting at least one mechanical property (M) equal or above a target value Mtarget is provided. The method includes a calibrating process involving heat treatments on at least 2 samples of the steel, corresponding to Pareq values P, submitting said samples to X-ray diffraction so as to obtain spectrums including a main peak whose width at mid height FWHM is being measured, measuring a mechanical property (M) of said samples, measuring a recovery or recrystallization state of each sample, drawing a curve of M as a function of FWMH in a domain where the samples are recovered from 0 to 100%, but not recrystallized. The method further includes calculating a FWHMtarget corresponding to a target mechanical property Mtarget, determining a pareq value Ptarget of the heat treatment to perform to reach Mtarget and selecting a time ttarget and a temperature T°target corresponding to the Ptarget value. The method further includes feeding a recrystallized steel sheet having a Mrecrystallization, cold-rolling the recrystallized steel sheet in order to obtain a steel sheet having a Mcold-roll and annealing the cold rolled steel sheet at a temperature T°target during a time ttarget.