Influence of Coincidence Site Lattice Boundary on Creep Resistance of P91 Steel Weldments

Das, C R and Albert, S K and Laha, K and Swaminathan, J and Ravi, S and Bhaduri, A K and Murty, B S and Mayer, P (2014) Influence of Coincidence Site Lattice Boundary on Creep Resistance of P91 Steel Weldments. Procedia Engineering, 86 (NIF-0.629). pp. 80-87.



The grain boundary structure is usually described by the coincidence site lattice (CSL) model based on the misorientation of adjoining crystals. Therefore, the objective of the present investigation is to seek the correlation between CSL fraction and creep resistance of modified 9Cr–1Mo steel (P91) with and without boron addition. Results showed that CSL fraction increases with increase in heat treatment temperature and this increase is more prominent in boron containing modified 9Cr–1Mo steel. Creep test results show the increase in creep rupture life with increase in CSL fraction for both the base metals; but this increase is more in boron containing steel than the boron free steel. This improvement is attributed to the stability of CSL boundaries in the material. In spite of the increase in CSL boundaries with normalizing heat treatment temperature, boron free material shows less creep rupture life in its weldment than the boron containing steel weldment.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:P91 steel; Coincidence site lattice; creep rupture life
Divisions:Material Science and Technology
ID Code:7438
Deposited By:Dr. A K Sahu
Deposited On:03 May 2016 17:45
Last Modified:03 May 2016 17:45
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