利用电子背散射衍射(EBSD)和取向成像显微分析技术(OIM)研究了690合金原始晶粒尺寸对晶界工程(GBE)处理后晶界特征分布(GBCD)的影响.结果表明,原始晶粒尺寸对GBE处理提高低∑CSL晶界比例及控制晶界网络分布有明显的影响.在最终退火工艺相同时,根据不同的原始晶粒尺寸,在GBE处理中需要采用不同的冷变形量,才能够获得最佳的晶界网络分布.可以利用参数“晶粒平均应变量”来表达原始晶粒尺寸和冷变形量共同影响GBE处理效果的综合作用.
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