Improvement of room temperature fracture toughness in Cr2Nb-based alloys by heat treatment

K. W. Li; S. M. Li; X. B. Wang; H. Zhong; Y. L. Xue; H. Z. Fu

doi:10.1179/1743284714Y.0000000591

Improvement of room temperature fracture toughness in Cr₂Nb-based alloys by heat treatment

K. W. Li, S. M. Li, X. B. Wang, H. Zhong, Y. L. Xue, H. Z. Fu

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The microstructure and room temperature fracture toughness of binary Cr/Cr₂Nb alloys annealed at 1653 K for 30 h were investigated at both the hypo- and hypereutectic compositions. The experimental results indicate that the high temperature heat treatment has a beneficial effect on the room temperature fracture toughness of the Cr₂Nb/Cr alloys. After the heat treatment, the room temperature fracture toughness of the hypo- and hypereutectic alloys are increased by about 212 and 203%, which are 15 and 8 times higher than that of as-cast Cr₂Nb Laves phase (1-2 MPa m1/2). The fractographic analysis indicates that in the annealed condition, the strengthen of lamellar eutectic cohesive strength can provide significant toughening of the matrix by crack deflection, crack blunting and crack bridging mechanisms.

Original language	English
Pages (from-to)	59-62
Number of pages	4
Journal	Materials Science and Technology
Volume	31
Issue number	1
DOIs	https://doi.org/10.1179/1743284714Y.0000000591
State	Published - 1 Jan 2015

Keywords

Fracture toughness
Heat treatment
Laves phase

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10.1179/1743284714Y.0000000591

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title = "Improvement of room temperature fracture toughness in Cr2Nb-based alloys by heat treatment",

abstract = "The microstructure and room temperature fracture toughness of binary Cr/Cr2Nb alloys annealed at 1653 K for 30 h were investigated at both the hypo- and hypereutectic compositions. The experimental results indicate that the high temperature heat treatment has a beneficial effect on the room temperature fracture toughness of the Cr2Nb/Cr alloys. After the heat treatment, the room temperature fracture toughness of the hypo- and hypereutectic alloys are increased by about 212 and 203%, which are 15 and 8 times higher than that of as-cast Cr2Nb Laves phase (1-2 MPa m1/2). The fractographic analysis indicates that in the annealed condition, the strengthen of lamellar eutectic cohesive strength can provide significant toughening of the matrix by crack deflection, crack blunting and crack bridging mechanisms.",

keywords = "Fracture toughness, Heat treatment, Laves phase",

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doi = "10.1179/1743284714Y.0000000591",

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T1 - Improvement of room temperature fracture toughness in Cr2Nb-based alloys by heat treatment

AU - Li, K. W.

AU - Li, S. M.

AU - Wang, X. B.

AU - Zhong, H.

AU - Xue, Y. L.

AU - Fu, H. Z.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - The microstructure and room temperature fracture toughness of binary Cr/Cr2Nb alloys annealed at 1653 K for 30 h were investigated at both the hypo- and hypereutectic compositions. The experimental results indicate that the high temperature heat treatment has a beneficial effect on the room temperature fracture toughness of the Cr2Nb/Cr alloys. After the heat treatment, the room temperature fracture toughness of the hypo- and hypereutectic alloys are increased by about 212 and 203%, which are 15 and 8 times higher than that of as-cast Cr2Nb Laves phase (1-2 MPa m1/2). The fractographic analysis indicates that in the annealed condition, the strengthen of lamellar eutectic cohesive strength can provide significant toughening of the matrix by crack deflection, crack blunting and crack bridging mechanisms.

AB - The microstructure and room temperature fracture toughness of binary Cr/Cr2Nb alloys annealed at 1653 K for 30 h were investigated at both the hypo- and hypereutectic compositions. The experimental results indicate that the high temperature heat treatment has a beneficial effect on the room temperature fracture toughness of the Cr2Nb/Cr alloys. After the heat treatment, the room temperature fracture toughness of the hypo- and hypereutectic alloys are increased by about 212 and 203%, which are 15 and 8 times higher than that of as-cast Cr2Nb Laves phase (1-2 MPa m1/2). The fractographic analysis indicates that in the annealed condition, the strengthen of lamellar eutectic cohesive strength can provide significant toughening of the matrix by crack deflection, crack blunting and crack bridging mechanisms.

KW - Fracture toughness

KW - Heat treatment

KW - Laves phase

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JO - Materials Science and Technology

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IS - 1

ER -

Improvement of room temperature fracture toughness in Cr₂Nb-based alloys by heat treatment

Abstract

Keywords

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