不同组织X70钢在酸性土壤模拟溶液中的强激光与粒子束应力腐蚀敏感性
Stress Corrosion Cracking of X70 Steel with Different Microstructures in Acid Soil Simulation Solution
摘 要
采用慢应变速率拉伸试验(SSRT)及断口观测研究了不同显微组织X70钢的应力腐蚀破裂(SCC)敏感性.结果表明:X70钢及其不同热处理后的劣化组织在鹰潭土壤模拟溶液中均具有明显的SCC敏感性;三种组织X70钢的SCC敏感性整体上表现为随外加电位的降低而增大,组织硬化和晶粒过大都能增加材料的SCC敏感性.
热处理
鹰潭土壤
慢应变速率拉伸
应力腐蚀破裂(SCC)
X70 pipeline steel
heat treatment
Yingtan soil
SSRT
SCC
Abstract
The stress corrosion cracking(SCC)susceptibility of X70 steel with three types of microstructure was analyzed by means of slow strain rate testing(SSRT)and fracture surface(SEM)observation.The experimental results illustrated that the steel after different heat treatments had higher SCC susceptibility than the as received steel.With decreasing polarization potential,the SCC susceptibility of the X70 with different kinds of microstructure increased.Both hardening and grain coarsening can increase the SCC susceptibility.
中图分类号 TG172.4
所属栏目 试验研究
基金项目 国家科技基础条件平台建设项目(2005DKA 10400);“十五”规划重大项目基金资助项目(50499333-08)
收稿日期 2008/1/14
修改稿日期
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引用该论文: ZHAI Guo-li,LIU Zhi-yong,DU Cui-wei,LI Xiao-gang,WANG Li-xian. Stress Corrosion Cracking of X70 Steel with Different Microstructures in Acid Soil Simulation Solution[J]. Corrosion & Protection, 2009, 30(3): 149～152
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【4】黄春波,李光福,杨武.X70管线钢焊缝应力腐蚀破裂的研究[J].腐蚀与防护,2005,26(1):1-3.
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【6】许淳淳,池琳,胡钢,等.HCO-3浓度对X70钢阳极反应过程的影响[J].中国腐蚀与防护学报,2005,25(1):20-24.
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【10】Qiao L J,Luo J L,Mao X.Hydrogen evolution and enrichment around stress corrosion crack tips of pipeline steels in dilute bicarbonate solution[J].Corrosion,1998,54(2):115-120.
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【12】于少飞,钱百年,国旭鸣.加速冷却对X70钢热影响区组织与韧性的影响[J].金属学报,2005,41(4):402-406.
【13】陈玉华,王勇,韩彬.X70钢在役焊接热循环及粗晶区组织性能研究[J].兵器材料科学与工程,2005,28(4):22-25.
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