The Effect of B and Microalloying Elements (V, Ti, Nb) Additions on the Austenite Grain Growth of Low Alloy Steel

Adrian, H.; Pelczar, Marta; Adrian, A.; Augustyn-Pieniążek, J.

doi:10.4028/www.scientific.net/ssp.197.25

Cited by 7 publications

(9 citation statements)

References 6 publications

(4 reference statements)

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“…If the p-parameter is known, the exact grain size confidence interval is given by Eq. (11). The confidence interval a 2 -a 1 length is a decreasing function of the n and may be connected with the estimation precision.…”

Section: Discussionmentioning

confidence: 99%

“…[6]) only. For other metallurgical conditions the austenite chord length distribution follow the logarithmicnormal distribution [6,[10][11][12][13].…”

Section: Discussionmentioning

confidence: 99%

“…For given n and p, the Z:G (1/2,np), taking into consideration of Eq. (5), leads to the grain size confidence interval: (11) where the so-called critical values χ a 2 -a 1 length of the [a 1 ,a 2 ] interval characterises the length of the confidence interval. Fig.7 shows that the a 2 -a 1 length is a decreasing function of n (a part magnified 2 times for n<200 is shown only).…”

Section: Estimationmentioning

confidence: 99%

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Austenite Grain Size Estimation in Structural Steels by Linear Section Method / Ocena Wielkości Ziarna Austenitu Metodą Przekrojów Liniowych

Adrian¹,

Wiencek²

2015

Archives of Metallurgy and Materials

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Linear section of grains in polyhedral material microstructure is a system of chords on a test line. The mean chord length is the linear grain size of the material. In the prior austenite microstructure of low alloy structural steels, the chord length is a random variable which has the gamma distribution. The distribution parameters are closely related to the austenite linear grain size. Because the sequent chord lengths are statistically independent, the grain size interval estimation (confidence interval) may be performed by the chi-square distribution.

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Section: Discussionmentioning

confidence: 99%

“…[6]) only. For other metallurgical conditions the austenite chord length distribution follow the logarithmicnormal distribution [6,[10][11][12][13].…”

Section: Discussionmentioning

confidence: 99%

Section: Estimationmentioning

confidence: 99%

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Austenite Grain Size Estimation in Structural Steels by Linear Section Method / Ocena Wielkości Ziarna Austenitu Metodą Przekrojów Liniowych

Adrian¹,

Wiencek²

2015

Archives of Metallurgy and Materials

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“…The statistical independent grain chord lengths is of fundamental meaning. The second part contains the structural steels prior austenite grain chord lengths having the logarithmic-normal distribution [11][12][13][14][15][16]. The length of sequent chords were measured along test lines.…”

Section: Introductionmentioning

confidence: 99%

Austenite Grain Size Estimtion from Chord Lengths of Logarithmic-Normal Distribution

Adrian

Wiencek

2017

Archives of Metallurgy and Materials

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Linear section of grains in polyhedral material microstructure is a system of chords. The mean length of chords is the linear grain size of the microstructure. For the prior austenite grains of low alloy structural steels, the chord length is a random variable of gamma-or logarithmic-normal distribution. The statistical grain size estimation belongs to the quantitative metallographic problems. The so-called point estimation is a well known procedure. The interval estimation (grain size confidence interval) for the gamma distribution was given elsewhere, but for the logarithmic-normal distribution is the subject of the present contribution. The statistical analysis is analogous to the one for the gamma distribution.

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“…It should be noted that constants A and B depend on the method of determination; for this reason slightly different values for the same phase can be found in 6,7 . High technical usability belongs to the diagrams of different MX phases dissolved in austenite, determined for different steels on the basis of Equation (1) as well as to the computer programs calculating the chemical compositions and fractions of these phases as a function of temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of the precipitation of carbonitrides in microalloyed steels

Opiela¹

2015

Mater. Tehnol.

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The production of mass-products of microalloyed steels with a high strength requires a proper adjustment of the thermomechanical processing and the kinetics of the precipitation of the MX-type (M -microalloying element, X -metalloid) phases in austenite. The understanding of the effect of carbonitrides on the processes of hot-working and cooling from the finishing deformation temperature requires the knowledge of the mechanism of their formation and their stability in austenite. The research was carried out on newly manufactured Ti-V and Ti-Nb-V steels for forged machine parts with thermomechanical processing. The analysis of the precipitation of the carbonitrides with the stoichiometric compositions of TixV1-xCyN1-y and TixNbvV1-x-vCyN1-y was based on the Hillert-Staffanson model improved by Adrian. The effect of the austenitizing temperature in the range from 900°C to 1200°C on the grain size of the original austenite was investigated to verify the results of the calculation. The result provides the basis for a suitable design of the manufacturing process of the thermomechanical treatment to obtain high-strength forged elements of microalloyed steels. Keywords: microalloyed steels, MX-type phases, thermomechanical processing Proizvodnja masovnih izdelkov iz mikrolegiranih jekel z visoko trdnostjo zahteva pravilno prilagoditev termomehanske predelave in kinetike izlo~anja faze MX (M -mikrolegirni element, X -metaloid) v avstenitu. Razumevanje vpliva karbonitridov na procese vro~e predelave in ohlajanja iz temperature kon~ne deformacije zahteva poznanje mehanizma njihovega nastanka in stabilnosti v avstenitu. Raziskava je bila izvr{ena na novo izdelanih jeklih za odkovke Ti-V in Ti-Nb-V po postopku termomehanske obdelave. Analiza izlo~anja karbonitridov s stehiometri~no sestavo TixV1-xCyN1-y in TixNbvV1-x-vCyN1-y temelji na Hillertovem in Staffansonovem modelu, ki ga je izbolj{al Adrian. Preiskovan je bil vpliv temperature avstenitizacije v obmo~ju 900°C do 1200°C na prvotno velikost avstenitnih zrn, da bi preverili rezultate izra~unov. Rezultati omogo~ajo pridobitev osnove za pravilno na~rtovanje postopka izdelave s termomehansko obdelavo odkovkov z veliko trdnostjo iz mikrolegiranih jekel.

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The Effect of B and Microalloying Elements (V, Ti, Nb) Additions on the Austenite Grain Growth of Low Alloy Steel

Cited by 7 publications

References 6 publications

Austenite Grain Size Estimation in Structural Steels by Linear Section Method / Ocena Wielkości Ziarna Austenitu Metodą Przekrojów Liniowych

Austenite Grain Size Estimation in Structural Steels by Linear Section Method / Ocena Wielkości Ziarna Austenitu Metodą Przekrojów Liniowych

Austenite Grain Size Estimtion from Chord Lengths of Logarithmic-Normal Distribution

Thermodynamic analysis of the precipitation of carbonitrides in microalloyed steels

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