形变对铁铜合金时效析出的影响

基金项目:

国家自然科学基金资助项目(No.50471089)

详细信息

Influence of thermo-mechanical processing on aging precipitation of Fe-Cu alloys

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Shougang Technical Research Institute, Shougang Iron and Steel Group Co., Beijing 100041, China

摘要: 对铁铜合金分别进行50%和80%冷变形,利用金相显微镜以及高分辨投射电镜研究形变热处理过程中的微观组织与沉淀析出,分析形变量对时效析出的影响.结果表明:变形有助于第二相的析出,大的冷变形量时沉淀相粒子形成的速率更快,所占体积分数更大.优先析出为富铜过渡相,这种富铜过渡相所形成的GP区对合金起强化作用,其后随时效时间延长这种富铜相逐渐转转变成ε-Cu.
- 铁铜合金 /
- 时效 /
- 形变热处理 /
- 析出 /
- GP区
Abstract: The aging precipitation of a Fe-Cu alloy cold-deformed 50% and 80% was studied. Optical microscope and HREM were employed to observe the microstructure and precipitation in thermo-mechanical processing, and the effect of cold deformation on the aging precipitation was analyzed. The results show that cold deformation is helpful to the precipitation of second phase, after a large quantity of cold deformation the precipitation is accelerated and the bulk volume of second phase becomes greater. Copper-rich transition phase is precipitated in advance and then transformed to ε-Cu phase with the increase of time during the overaging period. The copper-rich phase, i.e. GP zone, is the main cause to strengthen the alloy.
- Fe-Cu alloy /
- aging /
- thermo-mechanical processing /
- precipitation /
- GP zone