Influence of microalloying additions on thickness of grain boundary carbides in ferrite–pearlite steels

Mintz, B.; Tajik, S.; Vipond, R.

doi:10.1179/mst.1994.10.2.89

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…10-12. As in other work, stringer M-A particles did not appear to provide any effective obstacle to crack propagation. 20,24 Mintz et al regarded cracking of the carbide [6][7][8][9] and martensite films 47 to be a significant factor in relating microstructure to toughness data. The changes in Charpy impact behaviour were explained by considering the martensite films as being similar to the brittle grain boundary carbides present in the ferrite-pearlite steels.…”

Section: Cracking and Debonding Of M-a Phasementioning

confidence: 99%

“…It is now well accepted that in ferritepearlite steels, the thickness of cementite is a major factor controlling the ITT. [4][5][6][7][8][9] In the models of Almond et al 10 and Petch, 11 both of which predict the fracture stress in terms of microstructural parameters, terms for average grain size and average carbide thickness are included. While Petch 11 did not produce experimental data to support his model, in a subsequent paper, Bingley and Siwecki 12 analysed the data from three carbon steels using a modified Petch approach.…”

Section: Introductionmentioning

confidence: 99%

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Effect of morphology of martensite–austenite phase on fracture of weld heat affected zone in vanadium and niobium microalloyed steels

Baker

2010

Materials Science and Technology

145

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Section: Cracking and Debonding Of M-a Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of morphology of martensite–austenite phase on fracture of weld heat affected zone in vanadium and niobium microalloyed steels

Baker

2010

Materials Science and Technology

145

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“…Nb lowers the transformation temperatures and so will make the steel more susceptible to forming lower transformation products but there is also evidence [31] which suggests it raises the pearlite transformation temperature and because it is a carbide former encourages thicker and more numerous carbides. Its big advantage of course is its grain refining ability on rolling.…”

Section: Discussionmentioning

confidence: 99%

The influence of a high aluminium addition on the strength and impact behaviour of hot-rolled Nb containing steels

Mintz

Qaban

Bendke

et al. 2020

Materials Science and Technology

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An addition of 0.3 wt-% Al has been made to a Nb containing 0.1 wt-% C, 1.4 wt-% Mn steel in an attempt to improve its impact behaviour on hot rolling to 15 mm thick plate; the intention being to replace some of the specifications that currently can only be achieved by the more expensive methods of control rolling or normalising. Previous work had shown that a 0.2 wt-% Al addition to a hot-rolled plain C–Mn steel resulted in the impact transition temperature decreasing by 40°C with no significant change in strength making such a proposition possible. Unfortunately, the coarse austenite grain size of the hot-rolled Nb containing steel resulted on transformation in colonies of lower transformation products and Widmanstätten ferrite forming in the ferrite/pearlite microstructure resulting in poor impact behaviour. Reducing the cooling rate by working with thicker plate, 30 mm, led to little change in the mechanical behaviour on hot rolling. In contrast, on control rolling, the finer-grained steels which were virtually free of these lower transformation products showed a small benefit from the high Al addition even when Nb was present, particularly for the slower cooling rate, the 27J impact transition temperature decreasing by ∼20°C together with a small increase in yield strength. Further work is suggested to decrease the hardenability so that the original aim might be achieved.

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“…Previous work [9] has also shown that Nb containing steels can give coarser carbides as well as an increase in their density, both of which cause a deterioration in impact performance. The thickness of the grain boundary carbide has been shown to be dependent on the temperature of the pearlite reaction [10] and this depends on both the grain size and the presence of Nb, as can be seen from the following empirical equation for the Ar3, [8],…”

Section: -4mentioning

confidence: 94%

Hot rolled high Al containing steels as a replacement for the control rolled high strength low alloy (HSLA) steels

Qaban¹,

Mintz²,

Naher³

2017

AIP Conference Proceedings

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The extent to which Al and Nb can be used to improve the properties of hot rolled steels has been investigated with the aim of obtaining mechanical properties similar to those given by the more expensive, control rolled or normalised route, eg. API X52 line pipe. Three steels with 0.02%Al, 0.16%Al and 0.16%Al, 0.018%Nb have been examined and their strength and impact behaviour obtained. The 0.16%Al steel had a similar strength to the 0.02%Al containing steel~300MPa, but better impact behaviour (30-40°C lower 54J, ITT) with an impact transition temperature (ITT) of-90°C which from previous work will be due to a refinement of the grain boundary carbides. The present work shows that the addition of Nb to this high Al containing steel, although beneficial to strength, giving a lower yield strength (LYS) of 385 MPa, close to that given by some of the control rolled steels gives very poor impact behaviour with a 54J ITT of only-20°C. The improvement of strength is mainly a result of precipitation hardening by NbCN with some benefit from grain refinement while the deterioration of impact behaviour might be due to the presence of lower transformation products or coarser carbides. Further work is required to positively clarify the cause of this deterioration and to explore further options in achieving the aim of obtaining a hot rolled steel with strength in the range 350-400MPa and 54J ITT of-50°C.

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Influence of microalloying additions on thickness of grain boundary carbides in ferrite–pearlite steels

Cited by 10 publications

References 9 publications

Effect of morphology of martensite–austenite phase on fracture of weld heat affected zone in vanadium and niobium microalloyed steels

Effect of morphology of martensite–austenite phase on fracture of weld heat affected zone in vanadium and niobium microalloyed steels

The influence of a high aluminium addition on the strength and impact behaviour of hot-rolled Nb containing steels

Hot rolled high Al containing steels as a replacement for the control rolled high strength low alloy (HSLA) steels

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