Dissolution and precipitation behaviors of boron bearing phase and their effects on hardenability and toughness of 25CrMoNbB steel

Zheng, Yaxu; Wang, Fuming; Li, Changrong; He, Yutian

doi:10.1016/j.msea.2017.06.068

Cited by 24 publications

(10 citation statements)

References 19 publications

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“…This should only further encourage the B–Mo synergy. (Fe,Mo) 2 B precipitates have been found at austenite GBs by Zheng et al, which may result when the boron concentration at the GBs exceeds a critical value. Tungsten can have a similar effect, albeit only at higher contents compared with Mo (roughly factor 1.5)…”

Section: Influence Of Boron On Hardenabilitymentioning

confidence: 99%

“…Boron can also form chromium borides, e.g., in stainless steels which contain large amounts of Cr . Borides of the type M 2 B have also been documented in the steel 25CrMoNbB (M = Fe, Cr, Mo, due to presence of Cr and Mo in considerable amounts) . M 2 B can have a tetragonal or an orthorhombic crystal structure …”

Section: Thermodynamicsmentioning

confidence: 99%

“…A mass spectrometer determines the mass to charge ratio of the secondary ions and accurate chemical information about the removed secondary ions can be given . According to Tanaka, secondary ion mass spectroscopy (SIMS) has a spatial resolution of ≈200 nm, whereas Zheng et al reported a value of 1 μm for the same.…”

Section: Characterization Of Boron In Steelsmentioning

confidence: 99%

“…BN is believed to have no influence on hardenability because of the high‐dissolution temperature of 1100 °C (equilibrium condition) . On the contrary, Melloy and Russ proved that longer or repeating heat treatments at higher temperatures reduced the effect of boron on hardenability due to BN formation when no Ti or Zr is added .…”

Section: Influence Of Boron On Hardenabilitymentioning

confidence: 99%

“…Hardenability and toughness improvement was also observed in B‐ and Nb‐microalloyed 25CrMo steel, especially on the application of the double quench process. The choice of the austenitization temperature is critical for this purpose, as it controls the formation and dissolution of B‐containing precipitates and hence also the solute boron content (thus in turn B content at GB) . Investigations on the case‐hardening steels DIN 16MnCr5 and DIN 20MnCr5 showed that a B‐alloying lead to a 40% increase of the dynamic force measured in Brugger impact test.…”

Section: Effect Of Boron On Toughness and Possible Mechanismsmentioning

confidence: 99%

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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%

Section: Thermodynamicsmentioning

confidence: 99%