Das, C R and Albert, S K and Swaminathan, J and Bhaduri, A K and Raj, B and Murty, B S (2012) Improvement in creep resistance Of modified 9Cr-1Mo steel weldment By boron addition. WELDING IN THE WORLD, 56 (07-08). pp. 10-17.
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Abstract
The microstructural evolution in the heat-affected zones (HAZs) of boron-added modifi ed 9Cr-1Mo steel
(P91B) weldment is distinctly different from that of steel without boron addition (P91). This is accompanied
by less reduction in hardness in the inter-critical heat-affected zone (ICHAZ) of the weldment of the boroncontaining
steel than what is observed in boron-free steel. Though, tensile properties of both the boron-containing
steel weldments and boron free-steel weldments do not differ much at room and at high temperatures,
there is a signifi cant improvement in the creep strength of the weldment of the boron-containing steel over
that of the weldments of boron-free steel. In fact, for creep tests so far completed for weldments of P91B,
fracture occurred in the base metal, not in typical Type IV mode (fracture at the ICHAZ or fi ne grained heataffected
zone) as occurred for the P91 weldment for identical conditions of testing. This improvement is
explained based on the role of boron in modifying the HAZ microstructure of the steel.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Austenite; B additions; Creep strength; Grain size; Heat affected zone; Martensite |
| Subjects: | Materials Science > Materials Charcterization |
| Divisions: | Material Science and Technology |
| Depositing User: | Dr. A K Sahu |
| Date Deposited: | 06 Sep 2012 08:36 |
| Last Modified: | 03 Sep 2026 07:21 |
| URI: | http://eprints.nmlindia.org/id/eprint/5995 |
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