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

Research output: Contribution to journalArticle

39 Citations (Scopus)

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.
LanguageEnglish
Pages3869-3878
Number of pages9
JournalActa Materialia
Volume48
Issue number15
DOIs
Publication statusPublished - 25 Sep 2000

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Niobium
Steel
Titanium
Dispersion hardening
Electron energy loss spectroscopy
Grain growth
Austenite
Electrons

Keywords

  • microstructure
  • electron energy loss spectroscopy
  • EELS
  • energy dispersive X-ray analysis
  • EDX
  • microalloyed steels
  • carbides/nitrides

Cite this

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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.",
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Complex heterogeneous precipitation in titanium-niobium microalloyed Al-killed HSLA steels-II. Non-titanium based particles. / Craven, A.J.; He, K.; Garvie, L.A.J.; Baker, T.N.

In: Acta Materialia, Vol. 48, No. 15, 25.09.2000, p. 3869-3878.

Research output: Contribution to journalArticle

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AU - Craven, A.J.

AU - He, K.

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AU - Baker, T.N.

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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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KW - energy dispersive X-ray analysis

KW - EDX

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KW - carbides/nitrides

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