Effect of rare earth element yttrium addition on microstructures and properties of a 21Cr-11Ni austenitic heat-resistant stainless steel

被引:95
作者
Chen, Lei [1 ]
Ma, Xiaocong [2 ]
Wang, Longmei [1 ]
Ye, Xiaoning [3 ]
机构
[1] Cent Iron & Steel Res Inst, Dept Met Technol, Beijing 100081, Peoples R China
[2] Yanshan Univ, Coll Mech & Engn, Qinhuangdao 066004, Peoples R China
[3] Baoshan Iron & Steel Co Ltd, Ctr Res & Dev, Stainless Steel Branch, Shanghai 200431, Peoples R China
关键词
Ferrous metals and alloys; Microstructure; Mechanical; DYNAMIC RECRYSTALLIZATION; HOT DUCTILITY; GRAIN-GROWTH; DEFORMATION; IMPURITIES; FRACTURE; ALLOY; IRON;
D O I
10.1016/j.matdes.2010.11.022
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this comparative study, the microstructure and the mechanical properties of a 21Cr-11Ni austenitic heat-resistant stainless steel with and without addition of rare earth (RE) element yttrium have been investigated. The results show that a number of fine spherical yttrium-rich oxide particles are not uniformly distributed in the matrix of steel with yttrium; instead, they are aligned along the rolling direction. The grains surrounding the alignment are nearly one order of magnitude smaller than those farther away from the alignment. The approximate calculation results indirectly show that the grain refinement may be mainly attributed to the stimulation for nucleation of recrystallization rather than to pinning by particles. Furthermore, the alignment has resulted in significant loss in transverse impact toughness and tensile elongation at room temperature. There is a trough in the hot ductility-temperature curve, which is located between 973 and 1173 K. The ductility trough of steel with yttrium becomes shallow within a certain temperature range, especially around 1073K, indicating that improvement on hot ductility is achieved by yttrium addition. The results may be attributed to the increase of grain boundary cohesion indicated by the effective improvement on intergranular failure tendency, and the inhibitory effect of yttrium on sulfur segregation to grain boundaries is believed to be an important cause. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2206 / 2212
页数:7
相关论文
共 34 条
[1]  
AHLBLOM B., 1982, INT MET REV, V27, P1
[2]  
ANDERSEN I, 1995, ACTA METALL MATER, V43, P2689, DOI 10.1016/0956-7151(94)00489-5
[3]  
*ASTM INT, E8M04 ASTM INT, DOI DOI 10.1002/MACO.200303715
[4]  
*ASTM INT, E2306 ASTM INT
[5]   The effect of deformation on grain growth in Zener pinned systems [J].
Bate, P .
ACTA MATERIALIA, 2001, 49 (08) :1453-1461
[6]   Dynamic recrystallization under warm deformation of a 304 type austenitic stainless steel [J].
Belyakov, A ;
Miura, H ;
Sakai, T .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 255 (1-2) :139-147
[7]   Grain boundary mobility in Fe-base oxide dispersion strengthened PM2000 alloy [J].
Capdevila, C ;
Chen, YL ;
Jones, AR ;
Bhadeshia, HKDH .
ISIJ INTERNATIONAL, 2003, 43 (05) :777-783
[8]   Heterogeneous deformation and recrystallisation of iron base oxide dispersion strengthened PM2000 alloy [J].
Capdevila, C ;
Chen, YL ;
Lassen, NCK ;
Jones, AR ;
Bhadeshia, HKDH .
MATERIALS SCIENCE AND TECHNOLOGY, 2001, 17 (06) :693-699
[9]  
DARNFORS S, 1978, AVESTA STAINLESS B, V4, P3
[10]  
FANG KM, 1986, METALL TRANS A, V17, P315