热处理工艺对CN1515不锈钢管材晶界特征分布的影响

Effect of Heat Treatment Process on the Grain Boundary Character Distribution of CN1515 Stainless Steel Tubes

采用工厂生产线上的冷拔机对CN1515奥氏体不锈钢管材进行小变形量冷拔加工,然后在1 020~1 140℃进行热处理。利用电子背散射衍射(EBSD)和取向成像显微技术(OIM)研究了热处理温度及时间对CN1515奥氏体不锈钢管材晶界特征分布(GBCD)的影响。结果表明,在工厂生产设备上可以实现对CN1515管材的晶界工程(GBE)处理,经7%冷拔及在1 060~1 100℃再结晶退火10 min后,低ΣCSL晶界比例可以提高至80%以上。继续升高退火温度或者延长退火时间,低ΣCSL晶界比例下降。

Grain boundary engineering（ GBE） was applied to the manufacturing of CN1515 stainless steel tubes by cold drawing using a draw-bench and the subsequent annealing in a factory production line. The grain boundary character distribution（ GBCD） was analyzed with the electron back-scattered diffraction（ EBSD） and orientation imaging microscopy（ OIM） to investigate the effect of annealing temperature and time on the proportion of Low ∑ CSL grain boundaries（ GBs）. The results showed that the low ∑CSL GBs can be enhanced to higher than 80% by 7% cold drawing and subsequent annealing at the temperatures ranging from 1 060 ℃ to 1 100 ℃ for 10 min. The further increase of the annealing temperature or annealing time led to the decrease of proportion of Low∑CSL GBs.