Effect of the addition of niobium and aluminium on the microstructures and mechanical properties of micro-alloyed PM steels

Gündüz, Süleyman; Erden, Mehmet Akif; Karabulut, Hasan; Türkmen, Mustafa

doi:10.17222/mit.2015.248

Cited by 16 publications

(19 citation statements)

References 32 publications

(36 reference statements)

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“…Sintering is used to combine particles to each other in a certain temperature and time. Similar studies agree with this result [5][6][7]15]. Table 3.…”

Section: Resultssupporting

confidence: 89%

“…Figure 5 show that, in general, increasing the Nb-V ratio increases the yield strength, tensile strength and hardness value. This variation in strength values is caused by the formation of precipitates such as NbC(N) and VC(N), and their distribution in the matrix at different sizes [6,8]. Carbides and nitrides formed by alloying elements have different solubility values, as well as differing formation kinetics.…”

Section: Alloymentioning

confidence: 99%

“…The results indicated that the effect of niobium in dispersion strengthening is higher than that of vanadium. Niobium also increases the strength more than vanadium by increasing the pearlite ratio and forming small grains [6,7]. …”

Section: Alloymentioning

confidence: 99%

“…There is a sharp increase in the amount of niobium at the intersection of the analysis line with precipitates. The precipitates observed in PM steel samples by using SEM and EDS analyses are known to have significant effects upon recrystallization and austenite grain growth [6]. Figure 10 shows the fracture surfaces of Alloys 1-4 sintered at 1350 °C after tensile testing.…”

Section: Alloymentioning

confidence: 99%

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The Effect of the Sintering Temperature and Addition of Niobium and Vanadium on the Microstructure and Mechanical Properties of Microalloyed PM Steels

Erden

2017

Metals

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In this work, the effect of the sintering temperature on the microstructure and mechanical properties of Nb-V added powder metallurgy (PM) steels was investigated. The microstructure and mechanical properties of the Nb-V added PM microalloyed steel were examined by optical microscopy, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), optical emission spectrometer (OES), tensile and hardness tests. Results indicated that the optimal sintering temperature was 1350 • C and the addition of 0.1%, 0.15% or 0.2% of Nb-V increases the yield strength (YS), ultimate tensile strength (UTS) and hardness of the PM sintered steels. 0.2 wt % Nb-V added PM steel showed the highest values in yield strength (YS), ultimate tensile strength (UTS) and the highest hardness. Elongation also tends to improve with adding Nb-V content. In addition, Nb-V limited grain growth during austenitization.

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“…Sintering is used to combine particles to each other in a certain temperature and time. Similar studies agree with this result [5][6][7]15]. Table 3.…”

Section: Resultssupporting

confidence: 89%

Section: Alloymentioning

confidence: 99%

Section: Alloymentioning

confidence: 99%

Section: Alloymentioning

confidence: 99%

See 2 more Smart Citations

The Effect of the Sintering Temperature and Addition of Niobium and Vanadium on the Microstructure and Mechanical Properties of Microalloyed PM Steels

Erden

2017

Metals

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“…Nb is widely used in steels as a microalloying element for grain refinement. [14][15][16] In this work, the properties of Nb-free and Nb-containing grinding balls were investigated, and the feasibility of adding Nb to largesized grinding balls to improve their hardenability was studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb on the properties of a large-sized grinding ball

Song¹,

Zheng²,

Wang³

et al. 2019

Mater. Tehnol.

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Grinding balls are widely used in the mining industry due to their favorable properties; however, poor hardenability of largesized grinding balls is a limitation in wide applications. The hardenability and hardness of large-sized grinding balls can be affected by microalloying elements. In this work, Nb microalloying was used to improve the mechanical properties of largesized grinding balls. The microstructures and mechanical properties of Nb-containing grinding balls were studied in contrast to the Nb-free steel. Typical microstructures were observed with OM and SEM, respectively. The hardness was obtained with a Rockwell hardness tester. The results show that the typical microstructure of a large-sized grinding ball was mainly martensite and that the fracture surface consisted of dimples of different sizes. The prior-austenite grain size (PAGS) was decreased from 31.5 μm to 22.6 μm by adding 0.04 % Nb with a refined microstructure.

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Determination of wear resistance of nickel-carbide alloy coating by atmospheric plasma spray technique on 30MnB5 alloy steel used in cultivator blades

Dilay

2023

Mater. Res. Express

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The wear that occurs during tillage in agricultural machinery shortens the material’s life and increases costs. This study investigated the microstructure and morphology of cultivator blades coated with atmospheric plasma spray (APS) process and tested under real field conditions using OM, SEM, EDX, and XRD techniques. Abrasion tests were conducted in an area of 110 hectares and under two different soil moisture conditions. Material properties were investigated using hardness and surface roughness tests. The coating process was successful both mechanically and metallurgically by applying Ni-WC ceramic-metal (cermet) powder on the surface of 30MnB5 steel substrate with APS. The oxide and carbide structures detected on the coating surface by XRD studies resulted in a 1.5 times higher coating hardness. Due to the hard carbide phases in the coating matrix, the grooves on the wear surfaces were shallow and narrow compared to the substrate sample. The surface roughness values of the coated sample were approximately two times higher than the substrate sample. Due to the microstructure and high hardness, the coated specimen experienced three times less abrasion in both humidity conditions. The APS method can be successfully applied to the machined parts of tillage machines. In the near future, the cost of agricultural production can be reduced, and the environment can benefit from this method. In conclusion, this study presents a feasible approach to improving the wear resistance of Ni-WC ceramic-metal alloy by plasma spray coating under real field conditions.

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Effect of the addition of niobium and aluminium on the microstructures and mechanical properties of micro-alloyed PM steels

Cited by 16 publications

References 32 publications

The Effect of the Sintering Temperature and Addition of Niobium and Vanadium on the Microstructure and Mechanical Properties of Microalloyed PM Steels

The Effect of the Sintering Temperature and Addition of Niobium and Vanadium on the Microstructure and Mechanical Properties of Microalloyed PM Steels

Effect of Nb on the properties of a large-sized grinding ball

Determination of wear resistance of nickel-carbide alloy coating by atmospheric plasma spray technique on 30MnB5 alloy steel used in cultivator blades

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