固溶温度对00Cr25Ni7Mo4N超级双相不锈钢显微组织及耐点蚀性能的影响  

Effect of Solution Temperature on Microstructure and Pitting Corrosion Resistance Property of Super Duplex Stainless Steel 00Cr25Ni7Mo4N

作　　者：吴忠忠[1] 宋志刚[2] 郑文杰[2] 陈斌[2] 

机构地区：[1]新科磁电厂,广东东莞523087 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《金属热处理》2007年第8期50-54,共5页Heat Treatment of Metals

摘　　要：研究了固溶温度对超级双相不锈钢00Cr25Ni7Mo4N显微组织及耐点蚀性能的影响。结果表明,在900～1020℃之间有金属间化合物σ相析出,对钢的性能和组织产生一定影响,特别是明显降低钢的耐点蚀性能;在1040～1100℃之间固溶处理耐点蚀性能最好。运用Thermo-Calc热力学软件分别计算相图、相含量、α和γ相的PREN(耐点蚀当量)值,与试验结果进行了对比分析。σ相稳定温度比Thermo-Calc预测结果高,在980℃以上计算的α和γ相含量与试验结果较一致,但计算的α和γ相PREN值不能正确评定耐点蚀性。The effect of solution temperature on the microstructure and properties of super duplex stainless steel 00Cr25NiTMo4N was studied. According to the results ,the intermetallic compound cr phase precipitates in the range of 900 1020 ℃ ,which affect the properties and microstructure, especially result in the steep decline of the steel＇s pitting corrosion resistance. Solution-treated in the range of 1040 - 1100 ℃ ,the 00Cr25NiTMo4N steel will gain the best pitting corrosion resistance. According to the phase diagram, phase content and PREN （ Pitting Resistance Equivalence Numeral） of ferrite and austenite were calculated with the Thermo-Calc thermodynamic software, the comparative analysis with the experiment results was carried out. The results show that the stable temperature of cr phase is higher than that is predicated by the Thermo-Calc. The α and γ phases content calculated by the software are as same as the test results above the 980 ℃, however,the PREN calculated by the software can＇t provide a reliable measure of pitting corrosion resistance.

关 键 词：超级双相不锈钢 固溶温度 耐点蚀性能 热力学 

分 类 号：TG142.71[一般工业技术—材料科学与工程]