Effect Of Boron Addition Research Articles

Effect of Boron Addition on Microstructure and Corrosion Behaviour of Leaf Spring Steel in Automotive Suspension Systems

Effect of Boron Addition on Microstructure and Corrosion Behaviour of Leaf Spring Steel in Automotive Suspension Systems

Effects of Boron Addition on the Microstructure and Mechanical Properties of γ′-Strengthened Directionally Solidified CoNi-Base Superalloy

Effects of Boron Addition on the Microstructure and Mechanical Properties of γ′-Strengthened Directionally Solidified CoNi-Base Superalloy

Effect of boron addition on the microstructure and wear resistance of laser beam directed energy deposited high chromium white irons

There is a demand for alloys produced by laser beam directed laser deposition (DED-LB) with better wear resistance than the traditionally manufactured alloys. In DED-LB of high chromium white iron (HCWI), the refined carbides at the micron scale can lead to inferior wear performance than the cast alloy of the same composition. In this study, various concentrations of FeB powder were mixed with HCWI powder and produced by DED-LB. The microstructural evolution and its relationship with the wear resistance in high stress abrasion wear test were studied. The B addition is a C equivalent element in HCWI, which can change the composition from hypoeutectic to hypereutectic. In the hypereutectic alloys, B promotes hard phases in the form of M7(C,B)3 and M3(C,B) (M mainly represents Cr and Fe). With the B additions, the volume loss in high stress wear testing is reduced due to the increase in the fraction of the hard phases and their coarsening. With the predominantly austenitic matrix, the alloy with 1.09 wt % B consisting of near 60 vol% hard phases showed a superior wear performance than the heat-treated cast alloy. This was attributed to the microstructure in the contact. The high fraction of refined hard phases and the relatively ductile austenitic matrix (compared with the martensitic matrix) work synergistically, showing a worn surface of plastic deformation without brittle spalling and pitting.

The combined effect of boron additives and cooling conditions during solidification on the structure and properties of complex-alloyed white cast irons of the Cr – Mn – Ni – Ti system

The combined effect of boron additives and cooling conditions during solidification on the structure and properties of complex-alloyed white cast irons of the Cr – Mn – Ni – Ti system

Effects of Boron Addition on Low Cycle Bending Fatigue Strength of Gas Carburized Low Alloy Steel

Effects of Boron Addition on Low Cycle Bending Fatigue Strength of Gas Carburized Low Alloy Steel

Bioactive apatite-wollastonite glass ceramics coating on metallic titanium for biomedical applications: effect of boron.

Metallic titanium (Ti) implant surfaces need improvement for bioproperties and antibacterial behavior. For this purpose, a new boron-doped bioactive apatite-wollastonite (AW) coating was successfully developed on the Ti plate surface. The effects of boron addition on the microstructure, mechanical properties, and bioproperties of the AW coating were investigated. With the addition of boron (B), the AW coating morphology became less porous and compact. In terms of bio properties, the rate of apatite formation increased with the addition of B, and the cell viability rate increased from approximately 66-81%. B addition increased the elastic modulus of the AW coating from about 24-46GPa and increased its hardness about 2.5 times. In addition, while no antibacterial activity was observed in the AW coating, the addition of boron slightly introduced antibacterial properties. The novel AW/B composite coating obtained is promising for Ti implant surfaces.

Effect of Boron Additions on the Microstructural Evolution and Properties of Fe-Mo-Cu-Ni-C Sintered Steel.

The effects of different boron (B) additions from 0 to 0.5 wt.% on the microstructure and properties of Fe-Mo-Cu-Ni-xB-C powder metallurgy (PM) steels were investigated in this work. The results indicated that the ferrite phase quantity decreased and disappeared, Ni/Cu became more homogeneous, and M2B phase formed, with the addition of B. The density and hardness of the sintered steels monotonously increased with increasing B content, whereas the tensile strength and impact toughness first increased and then decreased. The tensile strength of the steels reached a maximum value of 1097 MPa at a 0.2% B content, whereas the impact toughness reached a maximum value of 25.7 J/cm2 at a 0.1% B content and then sharply decreased when the B content exceeded 0.2%. Frictional wear experiments showed that the weight loss of the steels decreased with an increasing B content under low load conditions (100 N), and the lowest weight loss of 0.043 g occurred at a 0.2% B content. Under high load conditions (200 N), the 0.1% B content steel saw the lowest weight loss 0.075 g, exhibiting excellent wear resistance, but the abrasive resistance of the steels decreased with a further increase in the B content due to the germination of microcracks and large spalling caused by the high hardness and brittleness.

Effect of boron incorporation on the structural, morphological, and spectral properties of CdNb2O6:Dy3+ phosphor synthesized by molten salt process

The effect of boron addition on the structural, morphologic and spectral properties was investigated by using xDy3+ (x = 0.5, 3, 6 mol%) doped, and xDy3+, yB3+ (y = 0, 5, 15, 25 mol%) co-doped CdNb2O6 powders produced by molten salt method. X-ray diffractions (XRD) of all Dy3+ doped, and B3+, Dy3+ co-doped samples showed that they retained the single-phase structure. The homogeneous dissolution of the Dy3+ doping without forming an impurity phase in the structure can be attributed to the flux effect of the molten salt process and boron doping. Scanning electron microscopy (SEM) micrographs of the B3+, Dy3+ co-doped grains showed that the effect of boron promotes grain growth and prismatic-like grain shape. Photoluminescence (PL) emissions of the phosphors with the excitation of 351.9 nm were monitored by the 4F9/2→6H15/2, 4F9/2→6H13/2, and 4F9/2→6H11/2 transitions. PL excitations and a broad peak at 275 nm originating from the O2–→Nb5+ band transition were observed with the emission of 577.9 nm. The PL emissions of Dy3+, B3+ co-doped phosphors increased about two fold compared to Dy3+ doped samples. The increase in PL may be related to the increased presence of luminescence centers at or near grain surface due to the decreasing surface area (SA)/volume (V) ratio as the growth of B3+ co-doped grains and the transformation from rod-like to prismatic-like shape. The increased Dy3+ presence led to a decrease in observed lifetime, while the B3+ increase did not cause any change. The study may provide a different perspective for the understanding and controlling of grain morphology and the luminescence relation for RE-doped phosphors.

Effect of boron addition on the microstructure and cryogenic mechanical properties of N50 stainless steel after aging treatment

The effect of boron on the microstructure and cryogenic mechanical properties in N50 austenitic stainless steel after aging treatment was revealed by a comparative investigation of 0B and 25B (25 ppm) N50 steels. The results showed there is a large amount of irregular block and rod-like Cr2N precipitated along grain boundaries with intra-granular precipitation of lamellar Cr2N in 0B steel; nevertheless, the nucleation and growth of Cr2N were significantly suppressed in 25B steel. It is related to the retarded diffusion of Cr, Mo, and V atoms caused by the pre-occupied B atoms during the precipitation of nitride. Theoretical calculations verify that the high B segregation at grain boundaries is caused by both equilibrium and non-equilibrium segregation. The weakened precipitation of nitride and the enhanced cohesion of grain boundaries by segregated B synergistically suppress the initiation and extension of intergranular cracks. The impact toughness of 25B–N50 steel at both 77 K and 4.2 K can reach 200 J, which is about 2.5 times higher than that of 0B–N50 steel.

Effects of boron addition on the high temperature oxidation of MoSi2 alloys

Boron containing MoSi2 is a promising material for applications at high temperature, but the oxidation mechanism is still unclear. In this work, the high temperature (1100 °C) oxidation of B doped MoSi2 in synthetic air has been investigated. A (boro)silicate layer is formed on the surface of the alloy, which features a mixture of amorphous SiO2 and cristobalite. After an initial transient period, the oxidation kinetics follows a parabolic growth rate law. The growth rate constant of the oxide layer is enhanced by the boron in the alloy by 90 % per at.% B. The increase in growth rate is associated with boron mitigating the formation of cristobalite thereby promoting the formation of amorphous SiO2.

The Effect of Boron Addition on the Structure and Mechanical Properties of Cu–Al–Ni–B Alloys with a Thermoelastic Martensitic Transformation

For the first time, data on the peculiarities of the structure of the Cu–Al–Ni–(B) alloys differing in the contents of alloying elements, namely, containing 10–14 wt % aluminum, 3, 4, 4.5 wt % nickel, and 0.02–0.3 wt % boron were obtained using optical, scanning, and transmission microscopy and X-ray diffraction analysis along with measurements of tensile mechanical properties. The effect of boron on the grain size, structure, phase composition, and mechanical properties of the shape-memory alloys has been studied. The localization of aluminum boride precipitates in the structure has been studied, and the effect of grain growthretardation in (α + β) and β Cu–Al–Ni–B alloys in both cast and heat-treated states has been found.

The Effect of Boron Addition on the Structure and Mechanical Properties of Cu–Al–Ni–B Alloys with a Thermoelastic Martensitic Transformation

The Effect of Boron Addition on the Structure and Mechanical Properties of Cu–Al–Ni–B Alloys with a Thermoelastic Martensitic Transformation

The effect of boron addition on the prosthetic dental materials: A review

Boron plays a crucial role and is likely to be important element for human body. Boron is present in the human system, with the highest concentration in bones and teeth. In recent years, there has been increasing research interest in the use of boron in human biological systems, particularly in applications of boron compounds for oral health in dental field. Additionally, studies have demonstrated that boron plays important role in development of new methods for immersion of boron compounds in dental materials. Dental materials that incorporate boron have the potential to be next generation class of biomaterials. Despite extensive research on boron's biological effect, more knowledge is required to comprehend it mechanism of action in oral environment and dental materials in long term clinical effect. This review aims to provide an overview of recent developments in boron research in prosthetic dentistry and to explore the effect on available dental materials and potential applications in the future.

Enhancement of elastic properties and surface plasmon resonance with the addition of boron oxide to the ZnO−SiO2 glass system

Glass substrates, with their ultrasonic and enhanced Raman signals, are ever-demanding for medical applications. This paper reports the effect of boron addition to the enhancement of the elastic properties and Raman shifting in the Surface Plasmon Resonance results for the zinc borosilicate glass substrate that can be used for optical biosensor applications. Such glasses were prepared by melt–the quenching method and characterized using a densimeter, X-ray diffraction measurement, Fourier transforms infrared spectroscopy, ultrasonic, and surface plasmon resonance spectroscopy. Results from the current study demonstrated how the composition of the glass influences the physical and elastic moduli of the boron-doped zinc silicate series. The physical characteristics of the zinc silicate glasses were predicted to alter significantly after adding boron as a modifier. The glass density decreased from 3392 to 2983 kg/m3 as the percentage of boron increased from 0.10 to 0.20 wt.%, then increased to 3191 kg/m3 at 0.30 wt.%. The X-ray diffraction and Fourier transforms infrared spectroscopy techniques verified the amorphous glass phase. The ultrasonic method determined the glass's ultrasonic longitudinal and shear velocity at a 5 MHz resounding recurrence at room temperature to study elastic moduli. When boron content is added, the longitudinal, Young, shear, and bulk moduli exhibit a decreasing and increasing trend. As the boron content increases and behaves as a modifier, the number of non-bridging oxygen will increase, which will cause the glass network to expand. In addition, the increase in Eopt occurs from 3.4883 to 3.4331 because the sample has a higher number of non-bridging oxygen. The shift for Otto configuration of the SPR results occurs with the increase of boron concentration. The fabricated glass can potentially be used to construct an integrated silicon-based glass substrate for an optical sensor.

Effect of Boron Addition on the Oxide Scales Formed on 254SMO Super Austenitic Stainless Steels in High-Temperature Air

Focusing on the serious volatilization of MoO3 in super austenitic stainless steel with a high Mo content, the influence of B on the formation of oxide film and the distribution of Cr and Mo was investigated at 900 °C and 1000 °C. Without the addition of B, Mo tends to diffuse to the surface, forming porous Cr/Mo-rich oxides, causing the volatilization of Mo. The addition of B can inhibit the diffusion of Mo to the surface, facilitate the diffusion of Cr to the surface and combines with O, providing conditions for the nucleation of Cr2O3. A large amount of Cr2O3 accumulated on the surface to form a dense passive film, which inhibited the diffusion of Mo to the surface, reduced the loss of Mo, and formed Mo/Cr-rich precipitates at grain boundaries that are close to the surface. However, it was difficult to form Mo-rich precipitates at the grain boundaries of a sample without B, which aggravated the volatilization of Mo from grain boundary to surface. Therefore, the addition of B can improve the oxidation resistance of 254SMO and inhibit the volatilization of Mo.

Effect of boron addition on microstructure and toughness of Ti-containing weld metals

Effect of boron addition on microstructure and toughness of Ti-containing weld metals

Effect of boron addition on microstructure and toughness of Ti-containing weld metals

Effect of boron addition on microstructure and toughness of Ti-containing weld metals

Fe-Al-Si-Type Iron Aluminides: On the Strengthening by Refractory Metals Borides.

The effect of boron addition into Fe–28Al–5Si–X (X = -, 2Mo, or 2Ti) on the structure and high-temperature yield stress was investigated. Generally, the alloying of binary Fe3Al-type iron aluminides by silicon significantly improves high-temperature mechanical properties by solid-solution strengthening. On the other hand, the workability and ductile properties at room or slightly elevated temperatures get worse with the increasing silicon content. Boron alloying together with titanium or molybdenum alloying is one of the ways to improve the workability of this type of alloy and, at the same time, ensure the formation of a sufficient amount of secondary phase particles required for effective strengthening. In this paper, the influence of 1 at. % of boron on high-temperature yield stress is evaluated in response to structural changes and compared with results obtained previously on the same type of alloy (Fe–28Al–5Si–2X, X= -, Mo, or Ti) but without boron alloying. It can be concluded that the network structure of borides of refractory metals formed due to boron alloying works more effectively for alloy hardening at higher temperatures than a mixture of silicides and carbides present in the boron-free alloy of the same composition.

Effect of boron addition on microstructure and mechanical properties of an additively manufactured superalloy

Effect of boron addition on microstructure and mechanical properties of an additively manufactured superalloy

Effect of Boron Addition on Thermal and Mechanical Properties of Cast ZA 12 Alloy

Effect of Boron Addition on Thermal and Mechanical Properties of Cast ZA 12 Alloy