Synergy of strengthening and toughening of a Cu-rich precipitate-strengthened steel
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
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Detail(s)
Original language | English |
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Article number | 142487 |
Journal / Publication | Materials Science and Engineering A |
Volume | 832 |
Online published | 10 Dec 2021 |
Publication status | Published - 14 Jan 2022 |
Link(s)
Abstract
A high strength steel with a combination of ∼930 MPa yield strength and excellent low temperature toughness with an upper shelf energy of above 200 J and ductile brittle transition temperature (DBTT) of lower than −90 °C is developed. The strengthening and toughening mechanisms are investigated systematically based on the detailed characterization on microstructures including the matrix and precipitates. The results indicate that the steel is composed of a fine lath martensite with rod-like Cu precipitates. The high strength is achieved by a combination of solid-solution strengthening, dislocation strengthening, grain boundary strengthening and precipitation strengthening of Cu-precipitates. The instrumented Charpy impact results further indicate that the crack propagation is the main factor affecting DBTT while the dislocation density has an obvious effect on both crack initiation and propagation. The fine lath structure of the low carbon martensite enhances the crack resistance and delays the rapid unstable crack propagation at low temperatures. Both the strengthening and toughening are thoroughly discussed in details.
Research Area(s)
- Crack propagation, Ductile-brittle transition, Impact toughness, Nanoprecipitate-strengthened steel, Strengthening mechanisms
Citation Format(s)
Synergy of strengthening and toughening of a Cu-rich precipitate-strengthened steel. / Wei, Xinghao; Cao, Xue; Luan, J.H. et al.
In: Materials Science and Engineering A, Vol. 832, 142487, 14.01.2022.
In: Materials Science and Engineering A, Vol. 832, 142487, 14.01.2022.
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review