Improvement in creep resistance Of modified 9Cr-1Mo steel weldment By boron addition

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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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
Official URL/DOI:
Uncontrolled Keywords:Austenite; B additions; Creep strength; Grain size; Heat affected zone; Martensite
Divisions:Material Science and Technology
ID Code:5995
Deposited By:Dr. A K Sahu
Deposited On:06 Sep 2012 14:06
Last Modified:06 Sep 2012 14:06
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