摘要
含铜高纯低碳钢时效后具有较高的强度和韧性,研究铜的固溶、沉淀规律具有重要意义.应用JEM-2010高分辨电镜研究了含铜高纯低碳钢中铜的沉淀规律,发现固溶态是在铁素体晶粒中分布着大量的铜原子的偏聚的有序畴.在时效硬度峰处,铁素体晶粒中分布着大量的铜原子富集的GP区,颗粒尺寸4～20 nm,其结构仍为体心立方晶格,存在(112)bcc和(112)bcc孪晶,并且与基体共格.此GP区颗粒是时效峰强化的根源.
High purity low-carbon steel bearing copper has excellent performance such as high strength and high toughness after aging. Study on the law of solution and precipitation of copper is significant. Herein, HRTEM was used to study precipitation law of steel bearing copper. The results showed that the solution state was not the evenly over saturated α-Fe but with lots of Cu atom cluster and ordering domain distributed in Ferrite matrix instead. In age-hardening hump, a vast G. P area exists, which aggregated copper atom in ferrite crystal grain. The size of G. P area was about 4- 20 nm and the structure was body-centered cubic lattice,with （112）bcc and （1^-1^-2）bcc twin existing in coherence with basal body. The G. P area was the root cause of age-hardening hump.
出处
《包头钢铁学院学报》
2005年第2期137-143,共7页
Journal of Baotou University of Iron and Steel Technology
基金
国家自然科学基金资助项目(50361001)
关键词
含铜高纯钢
有序畴
固溶
衍射分析
时效硬化
孪晶
GP区
high purity steel bearing cooper
ordering domain
solution
diffraction-analysis
age-hardening
twin
G. P area
