锻压技术

SAF2507SDSS热冲压成形σ相析出行为研究

英文标题：Study on precipitation behavior of σ phase in hot stamping forming for SAF2507SDSS

作者：胡珊蓝剑锋

单位：南昌工学院集美大学

分类号：TG142.1

出版年,卷(期):页码：2018,43(11):173-179

摘要：

采用1600 t XPS型液压压力机和成形模具对SAF2507SDSS板材进行850～1100 ℃的热冲压成形，使用光学显微镜、扫描电镜和X射线能谱仪并结合JMatPro软件的模拟计算，研究了SAF2507SDSS热冲压成形σ相的析出规律和热冲压成形不同阶段的时间和冷却速率对σ相的影响。结果表明：随着热冲压成形温度的升高，σ相在δ/γ相界处形核并朝着δ相区域生长，含量先增多后减少，σ相的析出机理为δ→σ＋γ2，950 ℃是σ相敏感析出温度，1050 ℃是σ相稳定存在的温度上限；由于热冲压成形移动、形变和保压阶段的冷却速率均大于σ相临界析出的冷却速率，并且移动、形变和保压阶段的时间均小于σ相临界析出孕育时间，而σ相形核析出只发生在保温阶段，因此，热冲压成形对σ相形核析出无影响。

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.

基金项目：

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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