Jarugula, R and Channagiri, S and Raman, SGS and Sundararajan, G (2021) Strengthening Mechanisms in Nano Oxide Dispersion-Strengthened Fe-18Cr Ferritic Steel at Different Temperatures. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 52 (5). pp. 1901-1912.
|
PDF
met_mat_tra_phy_met_mat_mat_sci_52-05_1901-1912_2021.pdf - Published Version Download (2MB) | Preview |
Abstract
The objective of the present work is to evaluate isothermal uniaxial compressive deformation behavior of nano oxide dispersion-strengthened (n-ODS)-18Cr ferritic steel over a range of temperatures RT�1173 K and range of strain rates 10�4 to 10�2 s�1. Irrespective of temperature, the influence of the strain rate on the yield strength is insignificant up to 673 K. It is found that the plot of variation of yield strength as a function of temperature exhibits three regimes, which indicates that different deformation mechanisms are governing the yield strength of n-ODS-18Cr steel. Transmission electron microscopic analysis of a sample deformed at the highest temperature of 1173 K and the lowest strain rate of 10�4 s�1 demonstrates no significant change in the grain size and nanoprecipitate size. Also, it confirms the interaction between dislocations and nanoprecipitates. Different deformation mechanisms governing the yield strength of n-ODS-18Cr steel are identified in all three regimes and their contributions are quantified. © 2021, The Minerals, Metals & Materials Society and ASM International.
| Item Type: | Journal Article |
|---|---|
| Publication: | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Publisher: | Springer |
| Additional Information: | The copyright for this article belongs to Springer |
| Keywords: | Binary alloys; Breeding blankets; Chromium alloys; Chromium metallography; Deformation; Dispersions; Ferrite; Iron metallography; Precipitation (chemical); Strain rate; Yield stress, Deformation mechanism; Highest temperature; Microscopic analysis; Nanoprecipitate; Nanoprecipitates; Strengthening mechanisms; Transmission electron; Uniaxial compressive, Chromium steel |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 01 Jul 2021 12:54 |
| Last Modified: | 01 Jul 2021 12:56 |
| URI: | http://eprints.iisc.ac.in/id/eprint/68606 |
Actions (login required)
 |
View Item |
