Transactions of Materials and Heat Treatment

Title：Study on precipitation behavior of σ phase in hot stamping forming for SAF2507SDSS

Authors： Hu Shan Lan Jianfeng

Unit： Nanchang Institute of Science & Technology Jimei University

KeyWords： SAF2507SDSS plates hot stamping forming σ phase precipitation regulation JMatPro saftware

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2018,43(11):173-179

Abstract：

SAF2507SDSS plates were subjected to hot stamping forming between 850 ℃ to 1100 ℃ by 1600 t XPS hydraulic press and forming die, and the precipitation regularity of σ phase in hot stamping forming for SAF2507SDSS and the influences of time and cooling rate on σ phase in different stages of hot stamping forming were studied by optical microscope, scanning electron microscope, X-ray energy dispersive spectrometer and JMatPro software. The results show that with the increasing of temperature in hot stamping forming, σ phase nucleates at the δ/γ phase boundary and grows towards the δ phase region, and the contents of σ phase increase first and then decrease. Furthermore, the precipitation mechanism of σ phase is δ→σ+γ2，the most of sensitive precipitation temperature of σ phase is 950 ℃, and the stable temperature limit of σ phase is 1050 ℃. Because the cooling rate in the hot stamping forming movement, deformation, and holding pressure phases are all greater than the critical precipitation cooling rate of σ phase, the time of movement, deformation and holding pressure phases are all less than the σ phase incubating time, and the nucleation of σ phase occurs only in the heat preservation stage. Therefore, the hot stamping forming has no effect on the σ phase.

Funds：

江西省工程实验室专项课题一般项目（SZZX-17-10）

胡珊（1990-），女，硕士,E-mail：PPS201411824016@126.com

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