Accelerated creep behavior of Nb and Cu added 18Cr-8Ni austenitic stainless steel
Source abstract
Abstract
This investigation highlights the creep deformation and rupture behaviour of Nb and Cu added 18Cr-8Ni \naustenitic stainless steel and compared with those of commercial 18Cr-8Ni steel. Uni-axial creep tests were \nperformed at ( 288 – 320 ) MPa / 600 ° C and ( 80 – 110 ) MPa / 750 ° C on Nb and Cu added 18Cr-8Ni austenitic \nstainless steel. Accelerated creep tests predicted that creep characteristic of the alloy was insigni fi cant or \nanelastic type below the stress level of ∼ 166 MPa at 600 ° C and ∼ 57 MPa at 750 ° C. True creep exponent \nvalue of 8 at ( 288 – 320 ) MPa / 600 ° C and 4 at ( 80 – 110 ) MPa / 750 ° C, exhibited that the alloy followed high \ntemperature climb controlled power law creep in the speci fi ed creep test condition. The alloy was more \ncreep brittle in nature than that of commercial 18Cr-8Ni austenitic stainless steel. The brittleness was \nattributed to the presence of Nb ( C, N ) , nano-sized Cu precipitation along the transgranular region and \noccurrence of Cr 23 C 6 secondary carbides along the grain boundaries. Fractographic features revealed that \nthe alloy was prone to intergranular fracture due to creep cavitation and their linkages.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: High Temperature Alloys and Creep · Nuclear Materials and Properties · Fatigue and fracture mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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