Effect of boron addition on the microstructure and mechanical properties of 6.5% V-5% W high speed steel

Astini, Vita; Prasetyo, Yus; Baek, Eung Ryul

doi:10.1007/s12540-012-6003-6

Cited by 16 publications

(9 citation statements)

References 16 publications

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“…Cr‐containing boro‐carbides positively influence the toughness of Fe–B–C alloy steels, and also result in lower wear loss . HSS alloyed with boron are of interest since, on the one hand, they possess high hardness, wear‐resistance, and exceptional thermal stability owing to borides, and on the other hand, owing to the dissolved boron in the matrix, possess excellent hardenability, tensile, and bending strength . Techniques such as rapid solidification and powder metallurgy enable the addition of high amounts of boron and carbon while preventing the formation of coarse precipitates in the as‐cast microstructure and thus help achieve better mechanical properties …”

Section: Thermodynamicsmentioning

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: Thermodynamicsmentioning

confidence: 99%

Boron in Heat‐Treatable Steels: A Review

Sharma

Ortlepp

Bleck

2019

steel research int.

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“…Klimenkov et al [ 12 ] reported that B content also affected the density and composition of M 23 C 6 and MX precipitates, the appearance of BN, and affected the microstructure. Astini et al [ 13 ] found that the addition of 0.04% boron to the High Strength Steel (HSS) alloys increased the bending strength by more than 10% because the addition of boron reduced the cell size and produced finer carbide. Zhu et al [ 14 ] indicated that the addition of B only slightly decreased the bainite transformation temperature at low cooling rates (≤10 °C/s), whereas the combined addition of B + Nb greatly decreased the transformation temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of Boron Content on the Microstructure and Impact Toughness of 12Cr1MoVR Low-Alloy Heat-Resistant Steel Weld Metals

et al. 2021

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The impact toughness of low-Cr heat-resistant steel weld metal is an important problem to broaden the application of low-Cr heat-resistant steel. In this study, the microstructure and impact toughness of 12Cr1MoVR low-alloy heat-resistant steel weld metals with various boron contents (B1 = 0.0028%, B2 = 0.0054%, and B3 = 0.0079%) were investigated. The microstructures of all weld metals were composed of block ferrite, carbides, and inclusions. Results indicated that with increased B content, prior austenite grain sizes decreased, and minor microstructure changes could be found. With the increase in B content from 0.0028% to 0.0054% to 0.0079%, the ductile–brittle transition temperature of the weld metals decreased from 30 to 0 to −14 °C, the toughness of weld metal increased, and the hardness slightly decreased, all of which are directly related to the refinement of prior austenite grain size because of the addition of B content. However, on the top-shelf zone, such as at the testing temperature of 80 °C, ductile fracture dominates the fracture surface; with the increase in B content, the size and density of inclusions increased gradually, which led to the decrease of the impact toughness at 80 °C when the B content was 0.0079%.

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“…According to the literature [8,9,10,11,12], the sintering process is activated through the presence of a liquid phase in three stages: (i) The initial stage is solubility and rearrangement, (ii) the intermediate stage is solution and reprecipitation, (iii) and finally, microstructural coarsening [12]. Unfortunately, boron is almost non-soluble in an iron-based solid matrix, so it remains at the grain boundaries, in the form of hard and brittle borides, after the sintering process, creating an almost continuous network surrounding the grains [1,3,6,13,14,15,16,17]. These borides separate the neighboring grains, significantly influencing the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Improving the Dimensional Stability and Mechanical Properties of AISI 316L + B Sinters by Si3N4 Addition

et al. 2019

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The following paper describes a new and effective method to obtain high-density sinters with simultaneously decreased distortions, produced by one press and sinter operation. This effect was achieved through the induced disappearance of the eutectic liquid phase. The study was carried out on AISI 316L stainless steel powder that was mixed with elemental boron and silicon nitride. Boron was used as a sintering process activator. The scientific novelty of this publication consists of the use of a silicon nitride as a solid-state nitrogen carrier that was intended to change the borides’ morphology by binding boron. Based on the thermodynamic calculations, 20 blends of various compositions were tested for physical properties, porosity, microstructure, and mechanical properties. Moreover, phase compositions for selected samples were analyzed. It was shown that the addition of silicon nitride as a nitrogen carrier decreases the boron-based eutectic phase volume and both increases the mechanical properties and decreases after-sintering distortions. An explanation of the observed phenomena was also proposed.

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Effect of boron addition on the microstructure and mechanical properties of 6.5% V-5% W high speed steel

Cited by 16 publications

References 16 publications

Boron in Heat‐Treatable Steels: A Review

Boron in Heat‐Treatable Steels: A Review

Effects of Boron Content on the Microstructure and Impact Toughness of 12Cr1MoVR Low-Alloy Heat-Resistant Steel Weld Metals

Improving the Dimensional Stability and Mechanical Properties of AISI 316L + B Sinters by Si3N4 Addition

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