| Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests |
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| 作者姓名： | Guangmin LUO Jiansheng WU and Qingsen MENG
Key Lab. for High Temperature Materials & Tests of Ministry of Education Shanghai JiaoTong University Shanghai China
School of Materials Science and Engineering Taiyuan University of Technology Taiyuan China |
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| 作者单位： | Guangmin LUO，Jiansheng WU and Qingsen MENG
Key Lab. for High Temperature Materials & Tests of Ministry of Education，Shanghai JiaoTong University，Shanghai 200030，China
School of Materials Science and Engineering，Taiyuan University of Technology，Taiyuan 030024，China |
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| 基金项目： | 山西省自然科学基金，Shanxi Science Institute of Power |
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| 摘 要： | 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 h
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Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests |
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| Guangmin LUO,Jiansheng WU and Qingsen MENG
Key Lab. for High Temperature Materials & Tests of Ministry of Education,Shanghai JiaoTong University,Shanghai ,China
School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan ,China.Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests[J].Journal of Materials Science & Technology,2004,20(4):383-386. |
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| Authors: | Guangmin LUO Jiansheng WU Qingsen MENG |
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| Affiliation: | 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. |
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| Keywords: | T91 steel Dissimilar metal joint Creep rupture test |
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