Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests

材料科学技术（英文）, 2004, 20(4): 383-386.

^1, , ^2, , ^3,

1.Key Lab. for High Temperature Materials & Tests of Ministry of Education, Shanghai JiaoTong University, Shanghai 200030, China

2.Key Lab. for High Temperature Materials & Tests of Ministry of Education, Shanghai JiaoTong University, Shanghai 200030, China

3.School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

基金项目: Shanxi Science Institute of Power 山西省自然科学基金(20031051)

Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests

Keywords： T91 steel

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 observe din 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.

参考文献

[1]	H Yossizawa.[J].Tetsu To Hagane-Journal of The Iron and Steel Institute of Japan,1996(12):1011.
[2]	Y.J.Lee;C.Muddle.[J].Scripta Materialia,1995(03):355.
[3]	R K SinghRamon .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,29A(02):577.
[4]	J rett;D.J.Abson;R.L.Jones.in Proc Inter ConfIntegrity of High-Temperature Welds[M].London England,1998:53.
[5]	D J Allen.in Proc Inter Conf Integrity of HighTemperature Welds[M].London England,1998:11.
[6]	A envenuti.[J].Materials Characterization,1996(12):271.
[7]	C D Lundin.[J].Welding Research Supplement,1982(02):58.
[8]	J F Mullen;R Clark.[J].Kahe Power,1995(01):41.
[9]	G Eggeler.[J].International Journal of Pressure Vessels and Piping,1994(60):273.
[10]	M Regev;S erger.[J].Welding Journal,1996(08):2615.
[11]	Z Zhang;A·W·Marshall.in Proc Inter Conf Integrity of High-Temperature Welds[J].London England,1998:77.

上一张下一张

计量

下载量()
访问量()

作者相关

在本站搜索
在百度学术搜索
在万方数据库搜索
在CNKI搜索

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网

Microstructural Evolution on the T91 Dissimilar Metal Joints during Creep Rupture Tests

参考文献