摘要
含铜高纯低碳钢具有高强度、高韧性等多种优良的性能,研究铜在钢中的沉淀规律具有重要意义。本文借助JEM-2010高分辨透射电镜研究了Fe-1.18Cu合金的时效组织,初步探讨了其时效强化机制。结果发现,在时效峰处,在铁素体基体上析出亚稳富铜颗粒。这种富铜过渡相形成的GP区对合金起强化作用。在时效过程中,析出颗粒周围存在着高密度的位错和层错。析出颗粒阻碍位错运动,提高合金的强度。
High purity low-carbon steel containing copper has many excellent performances, such as high strength, high toughness, etc. It is significant to study on the regularity of solution and precipitation of copper. The aged microstructures of Fe-1.18Cu alloy were observed by means of JEM-2010 HREM, and the aging strengthen mechanism was discussed. The results show that the metastable Cu-rich particles precipitate in the ferrite, and these Cu-rich GP zones play a role in aging strengthening. There are high-density dislocations and stacking faults surrounding the precipitate during aging treatment. These precipitates inhibit the dislocation motion and result in the strengthening effect.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2006年第11期31-34,共4页
Heat Treatment of Metals
基金
国家自然科学基金项目(50361001)
关键词
时效强化
位错
GP区
aging strengthening
dislocation
GP zone
