Enhancement in Creep Strength of Modified 9CR–1MO Steel Through Thermo-Mechanical Treatment

In the present investigation, microstructure of the modified 9Cr–1Mo (T91) steel was refined through thermo-mechanical treatment (TMT). The finer precipitation of M 23 C 6 and MX precipitates were observed in the TMT processed T91 steel. Creep deformation behaviour of T91 steel and TMT processed T91...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2017-07, Vol.70 (5), p.1177-1182
Main Authors: Sakthivel, T., Shruti, P., Parameswaran, P., Nageswara Rao, G. V. S., Laha, K., Srinivasa Rao, T.
Format: Article
Language:English
Subjects:
Chemical precipitation
Chemistry and Materials Science
Chromium molybdenum steels
Corrosion and Coatings
Creep rate
Creep strength
Heat resistant steels
Martensitic stainless steels
Materials Science
Metallic Materials
Precipitates
Technical Paper
Thermomechanical treatment
Tribology
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Summary:In the present investigation, microstructure of the modified 9Cr–1Mo (T91) steel was refined through thermo-mechanical treatment (TMT). The finer precipitation of M 23 C 6 and MX precipitates were observed in the TMT processed T91 steel. Creep deformation behaviour of T91 steel and TMT processed T91 steel was carried out at 923 K. The minimum creep rate of the TMT processed steel was significantly lowered as compared to T91 steel. The TMT processing of modified 9Cr–1Mo steel resulted in enhancement of creep strength due to presence of finer precipitates which relatively delayed the recovery of dislocation structure and coarsening of sub-boundaries than the steel in the normalized and tempered condition.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-016-0902-z