Intermetallic compounds in titanium-hardened alloys

Beattie, H. J.; Hagel, W. C.

doi:10.1007/bf03397940

Cited by 17 publications

(3 citation statements)

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“…In the present investigation, G-phase was identified in the materials having a small grain size (specimens 1, 2, and 7) except in specimen 6, but not in the materials having a large grain size (specimens [3][4][5]. However, no G-phase particles were found in the unaged samples, and there was no evidence that the smaller grain sizes in specimens 1, 2, and 7 were the result of the pinning of grain boundaries by G-phase particles.…”

Section: Discussioncontrasting

confidence: 49%

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Precipitate phases in type 321 steel

Lai¹

1985

Materials Science and Technology

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IntroductionThe precipitate phases in seven casts of AISI type 321 steel aged at 600°,Chave been studied. Apart from titanium carbides, nitrides, carbosulphides, and a-phase, the intermetallic G-phase was also detected in samples having a small grain size. The G-phase, which has not previously been reported in type 321 steel, is a fcc nickel-titanium-silicon phase with a lattice parameter of 1·12 nm. The chemical composition was found by energy-dispersive X-ray spectroscopy in a scanning transmission electron microscope to be 63Ni-21 Ti-12Si (wt-%). Theformation of G-phase is inhibited by large grain size and low 'excess' titanium content, i.e. the amount of titanium remaining after,deducting the amounts that are combined in TiC, TiN, and Ti4C 2 S 2 • When there is no 'excess' titanium, the remaining carbon is precipitated as M23C 6 • The formation of G-phase causes a further reduction in the amount of' 'excess' titanium in solution, and this may lead to a reduction in creep strength in long-term creep tests.MST/53

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Section: Discussioncontrasting

confidence: 49%

“…The chemical composition of G-phase was determined to be 63Ni-21Ti-12Si. 4. Precipitation in type 321 steel could be influenced by grain size and the 'excess' titanium content.…”

Section: Discussionmentioning

confidence: 99%