固溶温度对特级双相不锈钢组织及耐蚀性能的影响  

Effect of Solution Temperature on Microstructure and Corrosion Resistance of Hyper Duplex Stainless Steel

作　　者：顾兴[1] 向红亮[1] 卢奇敏[1] 王永霞[1] 

机构地区：[1]福州大学机械工程及自动化学院

出　　处：《特种铸造及有色合金》2013年第10期899-903,共5页Special Casting & Nonferrous Alloys

基　　金：福建省高等学校新世纪优秀人才支持计划资助项目(JA10014)

摘　　要：研究了固溶温度对N含量为0．51％和0．72％的特级双相不锈钢组织和耐蚀性的影响，并对比分析了特级双相不锈钢与超级双相不锈钢2906的耐蚀性能。结果表明，N含量为0．51％的特级双相不锈钢在1170～1220℃区间固溶处理时的组织只有α和γ两相组成，而N含量为0．72％的特级双相不锈钢经1170℃固溶处理会析出γ2相，随着固溶温度升高，γ2相消失。N含量为0．51％和0．72％的特级双相不锈钢均在1200℃固溶处理时耐蚀性能最好。特级双相不锈钢中，当组织中存在析出物γ2时，γ2处成为腐蚀薄弱点，最先发生点蚀破坏。N含量为0．72％的特级双相不锈钢耐蚀性优于0．51％的材料，2906超级双相不锈钢耐蚀性最差。Effects of solution temperature on microstructure and corrosion resistance of hyper duplex stainless steel contained 0.51% and 0.72 % N were investigated. And the corrosion resistance of hyper duplex stainless steel compared with super duplex stailess 2906 were analyzed. The results show that hyper duplex stainless steel containing 0.51% N is composed of ferrite phase and austenite phase with the solution treatment temperature in 1 170~1 220 ℃. γ2 precipitates can be observed in hyper duplex stain- less steel with 0.72%N at 1 170℃. As the solution treatment temperature increased to 1 200 ℃and to 1 220℃, γ2 precipitates are dissolved. Hyper duplex stainless steel containing 0.51%N and 0.72% N exhibits excellent corrosion resistance with the solution treatment temperature of 1 200 ℃. γ2 precipi- tates are susceptible to corrosion. The corrosion resistance of hyper duplex stainless steel with 0.72%N γ2 is superior-to that of ones with 0.51%N , Corrosion resistance of 2906 steel is the worst.

关 键 词：特级双相不锈钢 固溶温度 γ2相 耐蚀性能 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG156.94[金属学及工艺—金属材料]