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

Gu Xing; Xiang Hongliang; Lu Qimin; Wang Yongxia

doi:10.15980/j.tzzz.2013.10.008

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Effect of Solution Temperature on Microstructure and Corrosion Resistance of Hyper Duplex Stainless Steel
Vol. 33, Issue 10, Pages: 899-903(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.10.008

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[1]顾兴,向红亮,卢奇敏,王永霞.固溶温度对特级双相不锈钢组织及耐蚀性能的影响[J].特种铸造及有色合金,2013,33(10):899-903.

Gu Xing, Xiang Hongliang, Lu Qimin, et al. Effect of Solution Temperature on Microstructure and Corrosion Resistance of Hyper Duplex Stainless Steel. [J]. Special Casting & Nonferrous Alloys 33(10):899-903(2013)
[1]顾兴,向红亮,卢奇敏,王永霞.固溶温度对特级双相不锈钢组织及耐蚀性能的影响[J].特种铸造及有色合金,2013,33(10):899-903. DOI： 10.15980/j.tzzz.2013.10.008.

Gu Xing, Xiang Hongliang, Lu Qimin, et al. Effect of Solution Temperature on Microstructure and Corrosion Resistance of Hyper Duplex Stainless Steel. [J]. Special Casting & Nonferrous Alloys 33(10):899-903(2013) DOI： 10.15980/j.tzzz.2013.10.008.

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1 170

220℃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1 170℃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1 200℃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。

Abstract

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 2906were 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

220℃.γ2precipitates can be observed in hyper duplex stainless steel with 0.72%N at 1 170℃.As the solution treatment temperature increased to 1 200℃and to1 220℃

γ2precipitates 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 ℃.γ2precipitates are susceptible to corrosion.The corrosion resistance of hyper duplex stainless steel with 0.72%Nγ2is superior-to that of ones with 0.51%N

Corrosion resistance of 2906steel is the worst.