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J Mater Sci Technol  2004, Vol. 20 Issue (04): 383-386    DOI:
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Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests
Guangmin LUO, Jiansheng WU, Qingsen MENG
Key Lab. for High Temperature Materials & Tests of Ministry of Education, Shanghai JiaoTong University, Shanghai 200030, China
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Abstract  T91 steel is one of the new materials presently employed in power plant pipe components. The creep rupture strength and microstructure of the T91+10CrMo910 and T91+13CrMo44 welded joints were analyzed during creep rupture tests. Creep transgranular ductile rupture occurred at the 10CrMo910 matrix in the T91+10CrMo910 welded joints and creep intergranular brittle rupture occurred at the 13CrMo44 HAZ in the T91+13CrMo44 joints. Microhardness measurements showed high hardness at the heat affected zone (HAZ) of T91 and a sharply drop at the 13CrMo44 HAZ during creep rupture. The metallographic tests showed that no obvious microstructure degradation was observed in the 10CrMo910 HAZ and matrix, while creep cracks appeared at the 13CrMo44 HAZ. T91 steel had relatively high creep resistant strength in the welded joints tested. Recovery occurred in the T91 HAZ with the growth of subgrain size and the decrease of dislocation density during creep. It was concluded that the dissimilar joints of T91 and low alloy heat-resistant steel should have close creep strength matching to increase the service life of the overall joints at elevated temperature.
Key words:  T91 steel      Dissimilar metal joint      Creep rupture test      
Received:  01 January 1900     
Corresponding Authors:  Guangmin LUO     E-mail:  gmluo@vip.sina.com.cn

Cite this article: 

Guangmin LUO, Jiansheng WU, Qingsen MENG. Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests. J Mater Sci Technol, 2004, 20(04): 383-386.

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