Complex heterogeneous precipitation in titanium-niobium microalloyed Al-killed HSLA steels - II. Non-titanium based particles

A. J. Craven; K. He; L. A.J. Garvie; T. N. Baker

doi:10.1016/S1359-6454(00)00193-2

Complex heterogeneous precipitation in titanium-niobium microalloyed Al-killed HSLA steels - II. Non-titanium based particles

A. J. Craven, K. He, L. A.J. Garvie, T. N. Baker

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Abstract

An analytical electron microscopical investigation of three Ti-Nb Al deoxidized steels with different N:Ti ratios has been undertaken. In each steel, a large number of small (<10 nm) particles were observed. Parallel electron energy loss spectroscopy (PEELS) showed that their compositions in the three steels were consistent with those reported for the caps on the TiN cores in the equivalent steels in Part I, i.e. NbC_0.7N_0.3, NbC and (Nb_0.7Ti_0.3)C, respectively. The Nb incorporated in these caps added to that dissolved in the TiN cores results in a significant reduction in the number of small particles which give effective dispersion hardening. The size of this reduction depends on a number of competing factors. AlN precipitation also occurred in the as-rolled steel with highest N content and in the normalized steels with the two higher N contents. AlN is usually expected to control the austenite grain growth. NbC-based material grew on the AlN. A dendritic complex based on the iso-structural compounds MnSiN₂ and AlN was observed in the high N steel.

Original language	English (US)
Pages (from-to)	3869-3878
Number of pages	10
Journal	Acta Materialia
Volume	48
Issue number	15
DOIs	https://doi.org/10.1016/S1359-6454(00)00193-2
State	Published - Sep 25 2000
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/S1359-6454(00)00193-2

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title = "Complex heterogeneous precipitation in titanium-niobium microalloyed Al-killed HSLA steels - II. Non-titanium based particles",

abstract = "An analytical electron microscopical investigation of three Ti-Nb Al deoxidized steels with different N:Ti ratios has been undertaken. In each steel, a large number of small (<10 nm) particles were observed. Parallel electron energy loss spectroscopy (PEELS) showed that their compositions in the three steels were consistent with those reported for the caps on the TiN cores in the equivalent steels in Part I, i.e. NbC0.7N0.3, NbC and (Nb0.7Ti0.3)C, respectively. The Nb incorporated in these caps added to that dissolved in the TiN cores results in a significant reduction in the number of small particles which give effective dispersion hardening. The size of this reduction depends on a number of competing factors. AlN precipitation also occurred in the as-rolled steel with highest N content and in the normalized steels with the two higher N contents. AlN is usually expected to control the austenite grain growth. NbC-based material grew on the AlN. A dendritic complex based on the iso-structural compounds MnSiN2 and AlN was observed in the high N steel.",

author = "Craven, {A. J.} and K. He and Garvie, {L. A.J.} and Baker, {T. N.}",

note = "Funding Information: The authors would like to thank the EPSRC for support under grant GR/G12832 and Dr D.J. Price of British Steel for support under contract DJP/223/136.",

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T1 - Complex heterogeneous precipitation in titanium-niobium microalloyed Al-killed HSLA steels - II. Non-titanium based particles

AU - Craven, A. J.

AU - He, K.

AU - Garvie, L. A.J.

AU - Baker, T. N.

N1 - Funding Information: The authors would like to thank the EPSRC for support under grant GR/G12832 and Dr D.J. Price of British Steel for support under contract DJP/223/136.

PY - 2000/9/25

Y1 - 2000/9/25

N2 - An analytical electron microscopical investigation of three Ti-Nb Al deoxidized steels with different N:Ti ratios has been undertaken. In each steel, a large number of small (<10 nm) particles were observed. Parallel electron energy loss spectroscopy (PEELS) showed that their compositions in the three steels were consistent with those reported for the caps on the TiN cores in the equivalent steels in Part I, i.e. NbC0.7N0.3, NbC and (Nb0.7Ti0.3)C, respectively. The Nb incorporated in these caps added to that dissolved in the TiN cores results in a significant reduction in the number of small particles which give effective dispersion hardening. The size of this reduction depends on a number of competing factors. AlN precipitation also occurred in the as-rolled steel with highest N content and in the normalized steels with the two higher N contents. AlN is usually expected to control the austenite grain growth. NbC-based material grew on the AlN. A dendritic complex based on the iso-structural compounds MnSiN2 and AlN was observed in the high N steel.

AB - An analytical electron microscopical investigation of three Ti-Nb Al deoxidized steels with different N:Ti ratios has been undertaken. In each steel, a large number of small (<10 nm) particles were observed. Parallel electron energy loss spectroscopy (PEELS) showed that their compositions in the three steels were consistent with those reported for the caps on the TiN cores in the equivalent steels in Part I, i.e. NbC0.7N0.3, NbC and (Nb0.7Ti0.3)C, respectively. The Nb incorporated in these caps added to that dissolved in the TiN cores results in a significant reduction in the number of small particles which give effective dispersion hardening. The size of this reduction depends on a number of competing factors. AlN precipitation also occurred in the as-rolled steel with highest N content and in the normalized steels with the two higher N contents. AlN is usually expected to control the austenite grain growth. NbC-based material grew on the AlN. A dendritic complex based on the iso-structural compounds MnSiN2 and AlN was observed in the high N steel.

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Complex heterogeneous precipitation in titanium-niobium microalloyed Al-killed HSLA steels - II. Non-titanium based particles

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