Detection of microstructural changes of 9% Cr-martensitic steels during heat treatment and aging by polarization tests

被引:1
作者
Schmigalla, Sven [1 ]
Abstoss, Kevin G. [2 ]
Schultze, Sabine [1 ]
Mayr, Peter [2 ]
机构
[1] Inst Korros & Schadensanal Dr Ing Sabine Schultze, Schwiesaustr 11, D-39124 Magdeburg, Germany
[2] Tech Univ Chemnitz, Inst Joining & Assembly, Chemnitz, Germany
来源
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2020年 / 71卷 / 01期
关键词
aging; creep; Cr-martensitic steels; EPR; heat treatment; CREEP-BEHAVIOR;
D O I
10.1002/maco.201911144
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
9-12% chromium martensitic steels are widely used as pipe material in steam power plants. Their good creep behavior is based on a finely adjusted microstructure, which is strengthened by precipitates. During long-term use at higher temperatures degredation mechanisms occur, which affect the initial microstructure. Subgrain and precipitate coarsening as well as phase formation like Laves-phase ((Fe, Cr)(2)(Mo, W)) proceed and lead to a reduced creep resistance. For lifetime assessment a nearly nondestructive electrochemical test method would be beneficial to identify microstructural changes during periodical inspections. The paper is focussed on the usability of an adapted electrochemical potentiodynamic reactivation (EPR)-method and deals with the adjustment of test conditions like electrolyte composition and polarization parameters. The results obtained under optimized test conditions show a clear indication of precipitate formation by changing the characteristics of the EPR-curves for the well established alloy T/P91 (X10CrMoVNb9-1) as well as for the boron containing advanced alloy MARBN (X10CrWCoVNb9-3-3).
引用
收藏
页码:21 / 34
页数:14
相关论文
共 15 条
[11]   Cr, Mo and W alloying additions in Ni and their effect on passivity [J].
Lloyd, AC ;
Noël, JJ ;
McIntyre, S ;
Shoesmith, DW .
ELECTROCHIMICA ACTA, 2004, 49 (17-18) :3015-3027
[12]   Influence of microstructure and surface treatment on the corrosion resistance of martensitic stainless steels 1.4116, 1.4034, and 1.4021 [J].
Rosemann, P. ;
Mueller, Th. ;
Babutzka, M. ;
Heyn, A. .
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION, 2015, 66 (01) :45-53
[13]  
Sakuraya K., 2006, Energy Materials, V1, P158, DOI 10.1179/174892406X160624
[14]   Evaluation of High Temperature Material Degradation for 12Cr Steel by Electrochemical Polarization Method [J].
Seo, Hyon Uk ;
Park, Kee Sung ;
Yoon, Kee Bong .
TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS A, 2006, 30 (08) :965-975
[15]   Long-term creep behavior of 9-12%Cr power plant steels [J].
Sklenicka, V ;
Kucharová, K ;
Svoboda, M ;
Kloc, L ;
Bursik, J ;
Kroupa, A .
MATERIALS CHARACTERIZATION, 2003, 51 (01) :35-48