Effects of the alloying elements Ti, Nb, Mo and V on the grain boundary segregation of P in iron and steels

Grabke, H. J.; Möller, Reinhard; Erhart, H.; Brenner, S.S.

doi:10.1002/sia.740100405

Cited by 38 publications

(17 citation statements)

References 14 publications

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“…As a matter of fact, complex multiphase particles involving P and Mo have been observed to form upon ageing in our &-P-Mo alloys [1,39]. Also, an alternative trapping mechanism of P atoms in the stress field of MQC precipitates has been observed by APHM [34,40]. However, although it may be an interesting contribution in specific cases, this mechanism is not able to explain all cases of reduction in P segregation by Mo [I].…”

Section: Ternary Attractive Co-segregationmentioning

confidence: 97%

Thermochemical Interactions Versus Site Competition in Grain Boundary Segregation and Embrittlement in Multicomponent Systems

Guttmann¹

1995

J. Phys. IV France

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Section: Ternary Attractive Co-segregationmentioning

confidence: 97%

Thermochemical Interactions Versus Site Competition in Grain Boundary Segregation and Embrittlement in Multicomponent Systems

Guttmann¹

1995

J. Phys. IV France

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“…Niobium has been found to decrease phosphorus segregation in iron. 25 It was proposed that this decrease occurred by the formation of Nb-P clusters in the matrix, as no precipitates were detected. Therefore, we wanted to determine if niobium would also decrease phosphorus segregation in austenitic stainless steels.…”

Section: Segregation Of Phosphorus In a Niobiumcontaining Steelmentioning

confidence: 99%

A study of surface segregation in austenitic stainless steels—factors that control this segregation, its relation to grain boundary segregation and its usefulness for interpreting intergranular corrosion data

Briant

1988

Surface & Interface Analysis

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This paper reports a study of various factors that influence surface segregation in austenitic stainless steels. In particular four rather practical questions are addressed, all of which arose from various concerns about the corrosion behavior of these alloys. They are the following: (1) will significant segregation occur at temperatures below 500°C?; (2) is sulfur segregation affected by the presence of a strong sulfide former such as Mn?; (3) does silicon segregate to interfaces in these alloys?; and (4) do niobium additions affect phosphorus segregation in these alloys? The results show that at temperatures below 500°C, phosphorus, sulfur, nitrogen and silicon will all segregate, although at about 300°C the kinetics of segregation are becoming rather sluggish. Silicon will also segregate at temperatures at least up to 650OC. Manganese additions greatly lower sulfur segregation but niobium additions do not retard phosphorus segregation. In addition to the presentation of these results on surface segregation we consider what can IE learned from them about grain boundary segregation and how they can be used to help interpret results on intergranular corrosion and stress corrosion cracking.

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“…14) It has also been found that Nb had a repulsive interaction with P, when it segregated at the grain boundary of γ -phase. 15) In addition to the interaction between trace amounts of Nb and P during the quenching and tempering of high-carbon steel, if the harmuful effect of P on the precipitation of C during LTT 5) can be alleviated by adding trace amount of Nb, it might be useful suggestions for improving the properties of high-carbon steel used for knitting needles, and useful hints for understanding the LTT behavior of high-carbon martensite.…”

Section: Introductionmentioning

confidence: 99%

Development of Niobium Bearing High Carbon Steel Sheet for Knitting Needles

Tsuchiya¹,

Matsumura²,

Hosoya³

et al. 2020

ISIJ Int.

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The effect of Nb addition of less than 0.05 mass% on the quenching and tempering behavior of spheroidized eutectoid steel, which has usually being applied to knitting needles, was investigated. The results obtained are as follows. 1) Hardenability upon brief heating was markedly improved by 0.01 mass% Nb addition. 2) Both quenching elongation and its standard deviation decreased with 0.01 mass% Nb addition compared with those of Nb-free steel. 3) While hardly any effect of Nb addition on the hardness was observed during low-temperature tempering, not only the impact toughness but also the fatigue durability was improved by 0.01 mass% Nb addition. 4) Atom probe tomography (APT) analyses revealed that the precipitation of carbon in solution directly resulted in the formation of ε -and/or θ -carbides with carbon contents of around 25 at% without the formation of clusters with 10-15 at% C upon the addition of a trace amount of Nb. 5) For the same P content, the average bulk concentration of P in the martensite phase markedly increased with the addition of up to 0.05 mass% Nb. 6) Regarding the optimum Nb content of 0.01 mass% for various mechanical properties upon the low-temperature tempering of martensite, it is considered that the mechanical properties are dominated by the balance between the positive effect of promoting carbide precipitation during low-temperature tempering by Nb addition and the negative effect of deteriorating the toughness with increasing bulk concentration of P in the martensitic phase upon the addition of more than 0.02 mass% Nb.

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Effects of the alloying elements Ti, Nb, Mo and V on the grain boundary segregation of P in iron and steels

Cited by 38 publications

References 14 publications

Thermochemical Interactions Versus Site Competition in Grain Boundary Segregation and Embrittlement in Multicomponent Systems

Thermochemical Interactions Versus Site Competition in Grain Boundary Segregation and Embrittlement in Multicomponent Systems

A study of surface segregation in austenitic stainless steels—factors that control this segregation, its relation to grain boundary segregation and its usefulness for interpreting intergranular corrosion data

Development of Niobium Bearing High Carbon Steel Sheet for Knitting Needles

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