Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1580109 | Materials Science and Engineering: A | 2009 | 6 Pages |
Abstract
The paper deals with acoustic properties (Young's modulus E and logarithmic decrement δ) and impact toughness of the BCC alloys: low activation ferritic-martensitic steel EK-181 (produced in the RF) and V-(4-10)Ti-(4-5)Cr alloys (produced in the RF, USA and Japan). The materials have been investigated in â¼77-300 K temperature range where BCC metals usually become brittle at low temperatures. The acoustic measurements were made by composite oscillator technique mainly in the amplitude-independent damping (δi) range at frequencies of longitudinal vibrations of about 100 kHz. The data have been obtained for annealed, plastically bent and bent-then-straightened specimens. The δi(T) dependences for the pre-bent samples show a similar behavior as the impact toughness of the alloys. So, the ductile to brittle transition temperature (DBTT) for the BCC alloys can be determined by an acoustic non-destructive technique. It has been found that the acoustical DBTT depends on microstructure of specimens (internal stresses) and is different for the EK-181 steel of different thermal-mechanical treatments and for the RF, USA and Japan vanadium alloys. A comparison of the δi(T) curves for the BCC EK-181 steel and for the FCC austenitic EK-164 steel is shown and discussed as well. A viscous dragging of edge dislocations is found to control the ductile to brittle transition of the BCC alloys.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
B.K. Kardashev, V.M. Chernov,