Study of the Effect of Boron on The Decomposition of Austenite

Simcoe, Charles R.; Elsea, A. R.; Manning, G.K.

doi:10.1007/bf03377480

Cited by 25 publications

(14 citation statements)

References 2 publications

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“…Grange et al defined the effective range of boron additions to Q&T steels in terms of hardenability between 5 and 70 wt ppm which was further narrowed down to 4–10 wt ppm of soluble B by Schulte . Simcoe et al reported the boron content for obtaining maximum hardenability between 0.5 and 17 wt ppm, which depends on the carbon content of the steel only weakly. Kern and Schriever also found an improved hardenability by boron additions in Nb‐containing HSLA steels, when at least 90% of the total boron content of 22 wt ppm was in solution.…”

Section: Influence Of Boron On Hardenabilitymentioning

confidence: 99%

Boron in Heat‐Treatable Steels: A Review

Sharma

Ortlepp

Bleck

2019

steel research int.

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The science and technology of boron addition to heat‐treatable steels are explained. The aim is to address the following: How to add boron to steel (i.e., the manufacturing aspects of boron addition to steel)? What precautions are necessary when alloying boron to steel, in terms of composition (mainly nitrogen, aluminum, and titanium contents), processing and heat treatment (i.e., material and process robustness and reproducibility for a consistent steel quality)? Where does boron go in steel (i.e., the state of boron, interstitial or substitutional solute, precipitate or a complex with other alloying elements; as well as the location of boron, i.e., dissolved as a solute in the grain or segregated at the grain boundary)? Which characterization methods are suitable for the detection of the very small amounts of boron (<30 wt ppm) in heat‐treatable steels? What does boron do in steel (i.e., its effect on hardenability and mechanical properties, specifically impact toughness)? How does it do and what it does (i.e., the physical mechanism by which it influences the properties)? How much boron is really required to achieve the desired properties in heat‐treatable steels (i.e., recommendations for the optimum boron content)?

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Section: Influence Of Boron On Hardenabilitymentioning

confidence: 99%

Boron in Heat‐Treatable Steels: A Review

Sharma

Ortlepp

Bleck

2019

steel research int.

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“…Based on the results of various authors, 6,8,10) the role of different alloying elements on the ferrite nucleation can be generally be summarized as follows: -a changing of the g-a transformation temperature and as a result increasing (Mn, Ni, C and some other elements) 30) or decreasing (Al, Si, V, Cr, Mo, Ti and some other elements) the austenite zone, -a reduction of grain boundary energy, due to the segregation of solute elements such as B. 31,32) These results in an increase of the energy barrier and a decrease of the possibility for ferrite nucleation on the surface of grain boundaries, -a precipitation of inclusion particles favorable for nucleation of ferrite at the inclusion surface during the g-a transformation.…”

Section: Content Of Soluble Alloying Elementsmentioning

confidence: 99%

On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

2009

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The effects of non-metallic inclusions in nucleating acicular ferrite in steels during cooling from a weld or cooling from an austenitic temperature are reviewed. The influence of the acicular ferrite (AF) structure on mechanical properties of steels such as strength and toughness is briefly mentioned. The different factors affecting the formation of acicular ferrite, such as the soluble content of alloying elements in steel, cooling rate from austenitizing temperature, austenite grain size and inclusion characteristics in steel, are discussed. The mechanisms of acicular ferrite formation on non-metallic inclusions, such as reduction of interfacial energy, mismatch strain between the inclusion and ferrite/austenite, thermal strains at the inclusions and changes in matrix composition near the inclusions are also discussed. Finally, the effects of inclusion characteristics, such as size, number and composition are described and their effectiveness in nucleating acicular ferrite is discussed.KEY WORDS: non-metallic inclusions, intragranular acicular ferrite formation, strength and toughness, steel. 1063

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“…Th ey we re exa mined m etallog ra phically to d ete rmin e the a mount a nd th e type of tra nsform a tio n products . 4.…”

Section: Ttt Diagratnsmentioning

confidence: 99%

“…Therefore, the decrease in ha rd ena bility by higher temperature a ustenitization can be consistently explained without conside ring the deboronizat ion effect ll ) or the formation of th e unknown prec ipitates containing boron. 4 ) For prac ti cal purposes, th ese effe cts shou ld be full y considered for th e d e ter minat ion of both th e optimum boron conte nt a nd th e austenitizing temperature .…”

Section: The H Ardenability If B Oron-treated Steelsmentioning

confidence: 99%

Effect of Boron on Transformation of Low-carbon Low-alloy Steels

Yamanaka

Ohmori

1977

ISIJ Int.

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The effect oj boron on the transformation oj 10w-carbon- !-mo!),bdCllum steels has been investigated by means oj dilatomelly and microstructural observations. The steels containing boron below 30 ppm exhibits the largest hardenability in the case oj austenitization at 930°C, but the hal-denability is reduced by austmitization at higher temperatures. The hardenability oj the steel con taining boron oj 60 ppm does not ValY with the austenitizing temperature. While the steel with higher borol/ content than about 95 ppm increases its hardenability with increasing austClliti:::ing temperature up to I 130°C. Such behaviours can be explained in terms oj grain boundary segregation oj boron and the precipitation oj Fe 23 (B ,C)6' I n addition to this, the effects oj the precipitation oj BN on hardenability and the Clystatlography oj Fe 23 (B,C)6 are discussed.

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Study of the Effect of Boron on The Decomposition of Austenite

Cited by 25 publications

References 2 publications

Boron in Heat‐Treatable Steels: A Review

Boron in Heat‐Treatable Steels: A Review

On the Role of Non-metallic Inclusions in the Nucleation of Acicular Ferrite in Steels

Effect of Boron on Transformation of Low-carbon Low-alloy Steels

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