Heterogeneous creep deformation in Dissimilar Metal Welds (DMWs)

Subramanian, Mohan; Galler, Jonathan; DuPont, John N.; Kombaiah, Boopathy; Yu, Xinghua; Feng, Zhili; Babu, Sudarsanam

doi:10.1016/j.msea.2019.01.075

Heterogeneous creep deformation in Dissimilar Metal Welds (DMWs)

Journal Article · Wed Jan 30 00:00:00 EST 2019 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2019.01.075· OSTI ID:1808418

Subramanian, Mohan ^[1]; Galler, Jonathan ^[2]; DuPont, John N. ^[2]; ^[3]; ^[3]; ^[3]; Babu, Sudarsanam ^[4]

Univ. of Tennessee, Knoxville, TN (United States)
Lehigh Univ., Bethlehem, PA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Dissimilar Metal Welds (DMWs) made between ferritic low alloy steels and austenitic alloys are widely used in high temperature components of nuclear and fossil energy power plants. Literature shows that these bimetallic welds fail prematurely by creep mechanism close to the interface of the ferritic (BCC) and austenitic regions (FCC), with lifetimes much less than the creep lives of both materials. These creep failures are associated with cavity formation close to BCC/FCC interfaces. However, the spatial and temporal variations of creep strain rates in these DMWs have not been measured. In this research, DMW coupons were fabricated between 2.25Cr-1Mo steel and Alloy 800 H base material using a Ni base Inconel weld consumable. These samples were aged at 600 °C for 2000 h and 4000 h to induce two different sizes and distributions of Type I interfacial carbides and further subjected to a short term (~1 month) creep testing. Here, surface strains were measured with Digital Image Correlation (DIC) technique to extract local creep strain rates. In both samples, creep strain concentration occurred in the BCC matrix. The location of creep strain concentration from the BCC/FCC interface, changed from 5 µm (2000 h aged condition) to 400 µm (4000 h aged condition) depending on the initial carbide distributions in these regions.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain. Fuel Cycle Research and Development Program

Grant/Contract Number:: AC05-00OR22725; NE0008278

OSTI ID:: 1808418

Alternate ID(s):: OSTI ID: 1547817

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 749; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
Creep
Digital Image Correlation (DIC)
Dissimilar metal joining

Heterogeneous creep deformation in Dissimilar Metal Welds (DMWs)

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