Creep strength behavior of boron added P91 steel and its weld in the temperature range of 600–650 degree C
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
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| Title |
Creep strength behavior of boron added P91 steel and its weld in the temperature range of 600–650 degree C
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| Creator |
Swaminathan, J
Das, C R Baral, Jayashree Phaniraj, C Ghosh, R N Albert, S K Bhaduri, A K |
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| Subject |
Materials Science
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| Description |
One of the promising ways for mitigation of Type IV cracking – a failure by cracking at the
intercritical /fine grained heat affected zone, a life limiting problem in advanced 9–12 Cr ferritic
steel weld like that of P91 is through modification of alloy composition by addition of boron.
Addition of boron was observed to improve the microstructure at the weld zone and hence the
creep strength. In the present work, boron (100 ppm with controlled nitrogen) added P91 steel
after normalizing at 1050C and 1150C and tempered at 760C were studied for the creep
behavior in the base metal and welded condition in the temperature range of 600–650C. Creep
strength was characterized in terms of stress and temperature dependence of creep rate and
rupture time. Weld creep life was reduced compared to the base metal with rupture occurring at
the ICHAZ (Type IV crack). However at longer time (at lower stress levels) exposure creep
crack moves from weld metal to HAZ (Type II crack). Rupture life was found to superior for the
base and weld in the boron containing steel when higher normalizing temperature is used.
Estimation of 10 5 h was attempted based on short term rupture data available and weld strength
factors were calculated. Observed values are better for P91BH condition than the values for
P91BL condition as well as those available for P91 in open literature
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| Date |
2014
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| Type |
Conference or Workshop Item
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://eprints.nmlindia.org/7440/1/TMSEM__CREEP_STRENGTH_BEHAVIOR_OF_BORON_ADDED_P91_STEEL_A_JSN.pdf
Swaminathan, J and Das, C R and Baral, Jayashree and Phaniraj, C and Ghosh, R N and Albert, S K and Bhaduri, A K (2014) Creep strength behavior of boron added P91 steel and its weld in the temperature range of 600–650 degree C. In: Energy Materials Conference proceedings 2014, November 4-6, 2014, Xi'an Shaanxi Provice, China. |
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| Relation |
http://eprints.nmlindia.org/7440
http://eprints.nmlindia.org/7440/ |
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