采用电子背散射衍射(EBSD)技术研究了不同热处理工艺下1Cr18Ni9不锈钢的晶界特征分布。结果表明,原始态试样低Σ-CSL晶界含量在85%左右,主要分布在Σ3,Σ9,Σ27和Σ29四个晶界处;热处理后晶界特征分布变化明显,在水淬试样中低Σ-CSL晶界主要集中在Σ3和Σ9处,Σ3晶界占所有低Σ-CSL晶界的90%以上;在深冷试样中Σ3晶界的比例更大,占全部低Σ-CSL晶界的95%以上;水淬和深冷试样特殊晶界的含量基本一致,但在材料中的分布明显不同：水淬试样中低Σ-CSL晶界主要分布在大角度晶界处,但CSL晶界没有形成网络;在深冷试样中低Σ-CSL晶界主要分布在大角度晶界构成的晶界网络上,且形成了网络化的特殊晶界,有效阻断了一般大角度晶界间的连通性。

Effect of different heat treatment on grain boundary character distribution of 1Cr18Ni9 stainless steel was investigated by EBSD. The results showed that,in hot rolled specimen the low CSL grain boundary was about 85% and mainly locate at Σ3,Σ9,Σ27,Σ29;the grain boundary character distribution varied after heat treatment ,in water cooling specimen the low CSL grain boundary mainly located at Σ3 and Σ9 with Σ3 as much as 90%,in deep cooling specimen the number of Σ3 was even more,above 95%. The GBCD of specimens for water cooling and deep cooling was much similar,but its distribution were different,in water cooling specimen the low CSL mainly located at high angle boundaries but the CSL did not form a network;in deep cooling specimen the low CSL were distributed in the network of general high angle boundaries and formed a network of special boundaries which could cut off the connections in general high angle boundaries.