Bagui, Sumanta and Laha, K and Mitra, R and Tarafder, S (2018) Accelerated creep behavior of Nb and Cu added 18Cr-8Ni austenitic stainless steel. Materials Research Express, 5 . p. 116515.
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This investigation highlights the creep deformation and rupture behaviour of Nb and Cu added 18Cr-8Ni austenitic stainless steel and compared with those of commercial 18Cr-8Ni steel. Uni-axial creep tests were performed at ( 288 – 320 ) MPa / 600 ° C and ( 80 – 110 ) MPa / 750 ° C on Nb and Cu added 18Cr-8Ni austenitic stainless steel. Accelerated creep tests predicted that creep characteristic of the alloy was insigni ﬁ cant or anelastic type below the stress level of ∼ 166 MPa at 600 ° C and ∼ 57 MPa at 750 ° C. True creep exponent value of 8 at ( 288 – 320 ) MPa / 600 ° C and 4 at ( 80 – 110 ) MPa / 750 ° C, exhibited that the alloy followed high temperature climb controlled power law creep in the speci ﬁ ed creep test condition. The alloy was more creep brittle in nature than that of commercial 18Cr-8Ni austenitic stainless steel. The brittleness was attributed to the presence of Nb ( C, N ) , nano-sized Cu precipitation along the transgranular region and occurrence of Cr 23 C 6 secondary carbides along the grain boundaries. Fractographic features revealed that the alloy was prone to intergranular fracture due to creep cavitation and their linkages.
|Uncontrolled Keywords:||creep, 304HCu stainless steel, true creep exponent, fractography|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr. A K Sahu|
|Deposited On:||24 Sep 2018 08:56|
|Last Modified:||24 Sep 2018 08:56|
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