Superior creep resistance of a high-Cr steel with Re additives

Published on Mar 1, 2020in Materials Letters3.204
· DOI :10.1016/J.MATLET.2019.127183
Alexandra Fedoseeva10
Estimated H-index: 10
,
I. Nikitin5
Estimated H-index: 5
+ 1 AuthorsRustam Kaibyshev58
Estimated H-index: 58
Sources
Abstract
Abstract Re-containing 10Cr-3Co-3W martensitic steel with low nitrogen and high boron contents exhibited a rupture time of 10,987 h at 650°C/140 MPa. This superior creep resistance was caused by partially saved tempered martensite lath structure due to precipitation of M23C6 carbides and Laves phase chains on lath boundaries as well as their high resistance to coarsening. M23C6 carbides were characterized by decreased interfacial energy that resulted in the retention of the orientation relationship between M23C6 carbides and ferritic matrix. Re slowed down diffusion of W, Mo and Cr atoms.
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Abstract The purpose of this study is to identify the relationships between the creep behavior of the 10% Cr martensitic steel with 0.008% B and 0.003% N and changes in microstructure and precipitations of secondary phases. Creep tests were carried out at 650 °C under an applied stress ranging from 180 to 120 MPa. The 10% Cr steel exhibits a linear stress vs. time to rupture dependence without creep strength breakdown up to approximately 40 000 h. The 100 000 h creep rupture strength at 650 °C i...
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