On comparison of creep damage behaviour in two variants of titanium added 14Cr-15Ni stainless steel

Ruban, R.; Vijayanand, V.D.; Sivapirakasam, S.P.; Srinivasan, V.S.; Reddy, G.V. Prasad

doi:10.1016/j.engfailanal.2022.106525

Cited by 4 publications

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Beneficial role of short-term aging on creep performance of cold-worked Ti-added 14Cr–15Ni stainless steel

Vijayanand,

Ruban,

Sivapirakasam

et al. 2024

J Mater Sci

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The initial microstructure of cold-worked Ti-added 14Cr–15Ni stainless steel was modified through short-term aging and its influence on creep properties has been investigated at a test temperature of 973 K and two stress levels of 150 and 175 MPa. The improvement in rupture life of the condition comprising of post-aging was nominal at 175 MPa, but enhanced more than two times at 150 MPa when compared to the condition which comprised of prior cold work alone. Microstructural examination after creep testing showed that though M23C6 type of precipitates was prominent in both conditions, their size distribution varied with respect to processing condition (viz., one with prior cold work and another comprising of prior cold work followed by aging) as well as applied stress. Retention of cold work-induced dislocation structures aided by secondary TiC precipitates in the aged condition enhanced the rupture life at 150 MPa. Extensive recovery of the dislocation substructure was observed in the unaged condition tested at the same stress level. The size distribution of the dimples observed from the fractographs could be correlated with the extent of creep-induced cavitation. This work describes how the two preprocessing conditions influence the nucleation of M23C6 and secondary TiC precipitates during creep deformation. Graphical Abstract

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