Effect of Mo Concentration on the Microstructure Evolution and Properties of High Boron Cast Steel

Chen, Zhiguo; Miao, Sen; Kong, Lingnan; Wei, Xiang; Zhang, Feihong; Yu, Huan

doi:10.3390/ma13040975

Cited by 14 publications

(4 citation statements)

References 41 publications

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“…% B [20][21][22]. Moreover, while the effect of the alloying elements has been studied, the effect of cooling rate on their solubility has not attracted as much attention [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Sukhova

2021

Phys. Chem. Solid St.

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In the present study, the microstructure development and mechanical properties of the cast boron-rich Fe–B–C alloys cooled at 10 and 103 K/s were investigated as functions of alloying elements additions. These alloys were prepared in the following compositional ranges: B (10–14 wt.%), C (0.1–1.2 wt.%), M (5 wt.%), where M – Cu, Ni or Mn, balance Fe. Structural properties were characterized by quantitative metallography, X-Ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. Mechanical properties of the structural constituents, such as microhardness and fracture toughness, were measured by a Vickers indenter. Copper becomes negligibly incorporated into the phases Fe(B,C) and Fe2(B,C) of the Fe–B–C alloys, but solubility limit forces the remaining solute into the residual liquid. As a result, the globular Cu inclusions are seen in the structure. As compared with copper, nickel has higher solubility in the constituent phases, with preferential solubility observed in the Fe2(B,C) crystals, where Ni occupies Fe positions. Having limited solubility, nickel also forms secondary Ni4B3 phase at the Fe2(B,C) boundaries. Manganese was found to dissolve completely in the Fe–B–C alloys forming substitutional solid solutions preferentially with Fe(B,C) dendrites. By entering into the iron borides structure, Mn and Ni improve their ductility but lower microhardness. The peculiarities in the structure formation and properties of the doped boron-rich Fe–B–C alloys were explained with electronic structure of the alloying elements considered.

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“…% B [20][21][22]. Moreover, while the effect of the alloying elements has been studied, the effect of cooling rate on their solubility has not attracted as much attention [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Sukhova

2021

Phys. Chem. Solid St.

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“…Recent results have indicated that the alloying of the Fe-B-C alloys not only affects their structure, but also significantly decreases their brittleness [14][15][16][17][18][19]. To obtain high-quality coatings based on Fe-B-C alloys with good performance properties, it is important to be aware of their microstructure.…”

Section: Introductionmentioning

confidence: 99%

Formation of Structure and Properties of Boron-Rich Fe–B–C Alloys Alloyed with Cr, V, Nb or/and Mo

Sukhova¹

2021

Metallofiz. Noveishie Tekhnol.

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The effects of substitution of Fe in the boron-rich Fe-B-C alloys, containing 10.0-14.0% B and 0.1-1.2% C, 0-5.0 % Cr, V, Mo or/and Nb (in % wt.), are studied with combined analysis of optical microscopy, X-ray diffractometry, scanning electron microscopy, energy dispersive spectroscopy. The microstructure of the master Fe-B-C alloys consists mainly of primary dendrites of Fe(B, C) solid solution and Fe 2 (B, C) crystals peritectically formed from Fe(B, C) phase and the rest of the melt. As found, chromium or vanadium have high solubility in the constituent phases of the Fe-B-C alloys, with preferential solubility observed in the Fe(B, C) dendrites, where Cr or V occupy Fe positions. The addition of Cr or V to the Fe-B-C alloys helps to modify their brittleness: while it slightly decreases microhardness values, addition of these elements notably improves the fracture toughness of the constituent phases. Molybdenum or niobium are shown to be present in secondary phases identified as Мо 2 В, Мо 2 (B, C) or NbB 2 , respectively. The level of Mo or Nb contents in the Fe(B, C) and Fe 2 (B, C) solid solutions and quantity of the observed secondary phases indicate a very small Mo and no Nb solubility in the constituent phases. The Mo or Nb enhances a hardness of the master Fe-B-C alloy due to secondary phases' precipitation. To enhance performance characteristics of the boron-rich Fe-B-C alloys, the 1.0-2.0% Cr, 0.5-1.0%V, 1.0-3.0% Nb, 1.0-3.0% Mo are simultaneously added to the master alloy. The properties improve due to the formation of Cr-and Vcontaining Fe 2 (B, C) and Fe(B, C) solid solutions as well as Mo-and Nb-based secondary phases. The developed multicomponent alloy is recommended as a filler of macroheterogeneous composite coatings for strengthening of parts

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“…As such, these materials are utilized, for example, in the production of forging and stamping dies used in the manufacturing industry or valves, bearings and other production tubing system components used in the oil and gas industry [ 4 , 5 ]. Equally important is the application of boron for hardness enhancement through alloying, where the borides formed are utilized as hard reinforcing phases, e.g., boron alloyed tool steels [ 6 , 7 ], and high-boron white cast irons [ 8 , 9 , 10 , 11 , 12 ], etc.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Third Element on Nano-Mechanical Properties of Iron Borides FeB and Fe2B Formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) Alloys

et al. 2020

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In this study, the influence of alloying elements on the mechanical properties of iron borides FeB and Fe2B formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) alloys were evaluated using instrumented indentation measurement. The microstructural characterization of the alloys was performed by means of X-ray diffraction and scanning electron microscope equipped with an energy dispersive X-ray analyzer. The fraction of the phases present in the alloys was determined either by the lever rule or by image analysis. The hardest and stiffest FeB formed in Fe-B-X (X = C, Cr, Mn) alloys was observed in the Fe-B-Cr alloys, where indentation hardness of HIT = 26.9 ± 1.4 GPa and indentation modulus of EIT = 486 ± 22 GPa were determined. The highest hardness of Fe2B was determined in the presence of tungsten as an alloying element, HIT = 20.8 ± 0.9 GPa. The lowest indentation hardness is measured in manganese alloyed FeB and Fe2B. In both FeB and Fe2B, an indentation size effect was observed, showing a decrease of hardness with increasing indentation depth.

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Effect of Mo Concentration on the Microstructure Evolution and Properties of High Boron Cast Steel

Cited by 14 publications

References 41 publications

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Formation of Structure and Properties of Boron-Rich Fe–B–C Alloys Alloyed with Cr, V, Nb or/and Mo

The Influence of the Third Element on Nano-Mechanical Properties of Iron Borides FeB and Fe2B Formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) Alloys

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