摘要
利用电化学方法研究了高温中使用的奥氏体不锈钢的高温损伤行为。结果表明，奥氏体不锈钢在高温中使用时，初期产生Ｍ２３Ｃ６和ＴｉＣ相，之后经长时期使用时ＴｉＣ仍作为稳定相持续存在，随着Ｍ２３Ｃ６相的消失，σ相析出并急剧成长。σ相的析出引起材料的损伤。在１０ｍｏｌ／ＬＮａＯＨ溶液中合金相的阳极极化实验结果发现，在一定的电位下Ｉａ值与析出相有着对应关系，故采用Ｉａ值可有效地评价高温中使用的奥氏体不锈钢的高温损伤。
The degradation behavior of an austenitic stainless steel used at high temperatures was studied by the electrochemical method. The results showed that M 23 C 6 and TiC carbides nucleated and grew at the early period, TiC remained while σ phase nucleated and grew with decreasing M 23 C 6 after a long term exposure in the austenitic stainless steel in a high temperature environment. The σ phase caused the material degradation. The precipitates had active dissolution peaks (I a) at a particular potential which could be found in anodic polarization measurement in 10 mol/L NaOH solution . Thus the degadation of the austenitic stainless steel can be evaluated by means of I a.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1996年第2期100-103,共4页
Corrosion Science and Protection Technology
关键词
奥氏体
不锈钢
高温损伤
电化学
测量
austenitic stainless steel, M 23 C 6 carbide, σ phase, degradation, electrochemical measurement
