摘要
将沉淀强化型奥氏体钢在980℃固溶1 h后淬火,然后在500~850℃时效4 h,750℃析出强化效果最好。结合透射电子显微镜(TEM)和场离子显微镜(FIM),用原子探针层析技术(APT)研究强化相析出过程。结果表明,析出相为球形,是与基体共格的面心立方结构的γ’-Ni3(Al,Ti)相。随着时效温度提高,析出相尺寸增大,密度降低,Al元素和Ti元素在析出相与基体中的分配比逐渐提高,Ti元素的分配比明显高于Al元素,表现出更强的析出倾向。
Precipitation evolution in precipitation-hardened austenite steel solution-treated at 980 ℃ for 1 h then aged at 500-850 ℃ for 4h was characterized by means of atom probe tomography( APT) combined with field ion microscopy( FIM) and TEM. The results show that the spherical γ'-Ni3( Al,Ti) precipitates with face-centered cubic structure are coherence with the matrix. With aging temperature increasing,the size of the precipitates increases and the number density of the precipitates decreases,the partition ratio of Al and Ti between precipitates and matrix increases. Especially,a much higher ratio of Ti indicates that Ti has a stronger precipitation tendency than the other elements.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第9期65-69,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金重点项目(50931003)
上海市重点学科建设项目(S30107)
