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本文主要研究了00Cr15Ni6Mo2CuAl和00Cr16Ni6Mo3CuAl马氏体时效不锈钢的热处理制度与在含Cl-离子介质中耐点蚀性能的关系。结果表明:对于00Cr15～16Ni6Mo2～3CuAl马氏体时效不锈钢,随固溶温度的升高(780～1000℃),耐点蚀性能显著提高。时效强化处理使钢的耐点蚀性能有不同程度的下降,在450℃左右时效可以获得耐点蚀性能与力学性能的良好配合。点蚀主要在Laves相、σ-铁素体周围以及原始奥氏体晶界上发生。Laves相和σ-铁素体由于周围存在着贫铬、贫钼区而对点蚀敏感。在450℃和550℃时效状态,原始奥氏体晶界对点蚀的敏感性增加,这主要是由于时效相的析出、长大的缘故。
In this paper, the relationship between the heat treatment system of 00Cr15Ni6Mo2CuAl and 00Cr16Ni6Mo3CuAl martensitic stainless steel and the pitting corrosion resistance in Cl-containing medium were studied. The results show that the pitting corrosion resistance of 00Cr15 ~ 16Ni6Mo2 ~ 3CuAl martensitic stainless steel increases with the increase of solution temperature (780 ~ 1000 ℃). Aging treatment to pitting corrosion resistance of steel in varying degrees of decline in about 450 ℃ aging pitting resistance and mechanical properties can be obtained with the good. Pitting occurs mainly in the Laves phase, around the σ-ferrite and on the original austenite grain boundaries. Laves facies and σ-ferrite are sensitive to pitting corrosion due to the presence of depleted molybdenum and molybdenum zones around them. At 450 ℃ and 550 ℃ aging conditions, the original austenite grain boundary increases the sensitivity to pitting corrosion, which is mainly due to precipitation and growth of the aging phase.