Structural stability of dissimilar weld joints of steel P91

článek v časopise - ostatní, Jost

angličtina

This paper addresses the issue of C and N redistribution in weld joints of creep-resistant chromium steels. The redistribution of C and N was measured using the wave-dispersive X-ray method. The conditions of the long-term diffusion annealing process were: temperature 575, 625 and 700 oC; time 10, 100, 1 000 and 5 000 hours. It was ascertained that C and N diffused from the low-alloy steels to the high-alloy steel P91. The carbon diffusion coefficients in the individual steels of 15128/P91 and SK3STC/P91 weld joints, the ratio between the thermodynamic activity coefficients of carbon in joints, the diffusion interaction parameters , and their temperature dependencies were estimated from carbon concentration curves. The paper also contains a microstructure analysis of decarburized and carburized zones in the weld joints studied.

structural stabilidy, creep-resistant steels, weld joints, redistribution of C and N

FORET, R., MILLION, B., SVOBODA, M., STRÁNSKÝ, K.

2002

1. 1. 2002

1362-1718

Science and Technology of Welding and Joinig

6

6

Spojené království Velké Británie a Severního Irska

405

411

7