As-cast mechanical properties of vanadium/niobium microalloyed steels

Najafi, Hamidreza; Rassizadehghani, J.; Asgari, Siroos

doi:10.1016/j.msea.2007.08.057

Cited by 56 publications

(26 citation statements)

References 28 publications

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“…The chemical compositions of trials are given in Table.1 for all the heats. Using the literature [3][4][5][6][7][8][9] as reference vanadium, niobium and titanium additions were selected. Vanadium level was maintained at 0.10%, niobium and titanium levels were maintained at 0.05% and 0.025% respectively.…”

Section: Melting and Heat Treatmentmentioning

confidence: 99%

Optimization of Micro-Alloying Elements for Mechanical Properties in Normalized Cast Steel Using Taguchi Technique

Chokkalingam¹,

Raja²,

Anburaj³

et al. 2017

Archives of Foundry Engineering

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In this study, Taguchi method is used to find out the effect of micro alloying elements like vanadium, niobium and titanium on the hardness and tensile strength of the normalized cast steel. Based on this method, plan of experiments were made by using orthogonal arrays to acquire the data on hardness and tensile strength. The signal to noise ratio and analysis of variance (ANOVA) are used to investigate the effect of these micro alloying elements on these two mechanical properties of the micro alloyed normalized cast steel. The results indicated that in the micro alloyed normalized cast steel both these properties increases when compared to non-micro-alloyed normalized cast steel. The effect of niobium addition was found to be significantly higher to obtain higher hardness and tensile strength when compared to other micro alloying elements. The maximum hardness of 200HV and the maximum tensile strength of 780 N/mm 2 were obtained in 0.05%Nb addition micro alloyed normalized cast steel. Micro-alloyed with niobium normalized cast steel have the finest and uniform microstructure and fine pearlite colonies distributed uniformly in the ferrite. The optimum condition to obtain higher hardness and tensile strength were determined. The results were verified with experiments.

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Section: Melting and Heat Treatmentmentioning

confidence: 99%

Optimization of Micro-Alloying Elements for Mechanical Properties in Normalized Cast Steel Using Taguchi Technique

Chokkalingam¹,

Raja²,

Anburaj³

et al. 2017

Archives of Foundry Engineering

View full text Add to dashboard Cite

show abstract

“…The work of Najafi [5] and Rassizadehghani [6] indicated that good combinations of strength and ductility of low-carbon cast steels can be achieved by microalloying additions. However, microalloying significantly decreased the impact toughness and led to the dominance of cleavage facets in the fracture surfaces.…”

Section: Introductionmentioning

confidence: 99%

Enhancing impact fracture toughness and tensile properties of a microalloyed cast steel by hot forging and post-forging heat treatment processes

2013

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In the present work, the effects of hot forging and post-forging heat treatment on the impact fracture toughness and tensile properties of a microalloyed cast steel were investigated. Mechanical tests were used to evaluate the room temperature impact fracture toughness and tensile properties of the steel. The resulting microstructures were analysed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The extraction replica technology was used to investigate the characterisation of complex precipitates formed during heat treatment. The obtained results showed that the coarse-grained microstructure of the forged specimen was significantly refined after post-forging heat treatment. Presence of complex precipitates had a favourable effect on the formation of refined austenite grains, and consequently refined final microstructure. Hot forging was beneficial to enhance the impact fracture toughness and tensile properties of the microalloyed cast steel. After 920 °C-treatment followed by air cooling, the impact energy of the forged specimen was significantly increased from 19.3 to 208.3 J, and further enhancement in tensile properties was obtained. The enhanced impact fracture toughness and tensile properties of the microalloyed cast steel after hot forging and post-forging heat treatment were closely related to the refined and homogenised ferritic-pearlitic microstructure. Republic of Korea AbstractIn the present work, the effects of hot forging and post-forging heat treatment on the impact fracture toughness and tensile properties of a microalloyed cast steel were investigated. Mechanical tests were used to evaluate the room temperature impact fracture toughness and tensile properties of the steel. The resulting microstructures were analysed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The extraction replica technology was used to investigate the characterisation of complex precipitates formed during heat treatment. The obtained results showed that the coarse-grained microstructure of the forged specimen was significantly refined after post-forging heat treatment. Presence of complex precipitates had a favourable effect on the formation of refined austenite grains, and consequently refined final microstructure. Hot forging was beneficial to enhance the impact fracture toughness and tensile properties of the microalloyed cast steel. After 920℃-treatment followed by air cooling, the impact energy of the forged specimen was significantly increased from 19.3 to 208.3 J, and further enhancement in tensile properties was obtained. The enhanced impact fracture toughness and tensile properties of the microalloyed cast steel after hot forging and post-forging heat treatment were closely related to the refined and homogenised ferritic-pearlitic microstructure.

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“…It is known, alloy element V can refine the austenite grain, and improve the performance of the low alloy steel significantly [16]. As a strong carbide forming element, V can increase the transition temperature of γ-Fe→α-Fe, so the free energy between austenite and ferrite and the transition driving force increases, which is a beneficial favctor for forming bainite during the hardfacing process.…”

Section: Precipitation Regularitymentioning

confidence: 99%

Effects of Vanadium Addition on Microstructure and Tribological Performance of Bainite Hardfacing Coatings

Chen

Xing

Wang

et al. 2015

J. of Materi Eng and Perform

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As-cast mechanical properties of vanadium/niobium microalloyed steels

Cited by 56 publications

References 28 publications

Optimization of Micro-Alloying Elements for Mechanical Properties in Normalized Cast Steel Using Taguchi Technique

Optimization of Micro-Alloying Elements for Mechanical Properties in Normalized Cast Steel Using Taguchi Technique

Enhancing impact fracture toughness and tensile properties of a microalloyed cast steel by hot forging and post-forging heat treatment processes

Effects of Vanadium Addition on Microstructure and Tribological Performance of Bainite Hardfacing Coatings

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