1Cr18Ni9不锈钢热处理后的晶界特征分布及耐蚀性能  

Grain Boundary Character Distribution and Corrosion Resistance of 1Cr18Ni9 Stainless Steel after Heat Treatment

作　　者：金云学[1] 贾雨海[1] 郭宇航[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《热处理》2009年第2期32-36,共5页Heat Treatment

摘　　要：采用INCA Crystal电子背散射衍射分析系统研究了1Cr18Ni9不锈钢经不同工艺热处理后的晶界特征分布,并通过试验验证晶界特征分布对耐蚀性的影响。结果表明,原始态试样低∑-CSL晶界含量在85%左右,主要分布在∑3、∑9、∑27和∑29四个位置;热处理后晶界特征分布变化明显,在水淬试样中低∑-CSL晶界主要集中在∑3、∑9处,∑3晶界占所有低∑-CSL晶界的90%以上;在深冷试样中∑3晶界占全部低∑-CSL晶界的95%以上,并且低∑-CSL晶界主要分布在一般大角度晶界构成的晶界网络上,有效阻断了一般大角度晶界间的连通性;耐蚀试验结果表明,材料的极化电位原始态的为-0.299 V,热处理后增加到-0.200 V或更高,提高了耐蚀性。Grain boundary character distribution of 1Cr18Ni9 stainless steel after various heat treatment was investigated by EBSD analysis apparatus （INCA-Crystal, OXFORD）. The effect of grain boundary character distribution on the corrosion resistance of steel was investigated, too. The results show that the low ∑-CSL grain boundary is about 85% and is mainly located at ∑3, ∑9, ∑27 and ∑29 in hot rolled specimen. The variance in the grain boundary character distribution in specimen after heat treating is as follows： the low ∑-CSL grain boundary is mainly located at ∑3 and ∑9, with ∑3 amounting to more than 90% of overall low ∑-CSL in the water-quenched specimen,but in the deep freezed specimen .E3 amounts to more than 95% of overall low ∑-CSL, low ∑-CSL is mainly locaked at the grain boundary network consisting of general high angle boundary,with the connection of general high angle boundary being cut off. In the corrosion-resisting test the polarization potential of steel will increase from - 0. 299 V before heat treating to - 0. 200 V after heat treating, with the corrosion resistance of steel being enhanced.

关 键 词：1CR18NI9钢 EBSD 晶界特征分布 极化电位 耐蚀性 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG113.21[金属学及工艺—金属材料]