Effects of P and B addition on as-cast microstructure and homogenization parameter of Inconel 718 alloy

Miao, Zhongchen; Shan, Aidang; Wu, Yunxiang; Lü, Jun; Hu, Ying; Liu, Junliang; Song, Hongwei

doi:10.1016/s1003-6326(11)61177-1

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…Within traditional manufacturing methods, such as cast and wrought, the components present coarse grain size and heavy dendritic segregation, which is caused by the low cooling rate during solidification, as shown in Figure 4(f). 48 Solidification defects, such as shrinkage cavities and porosity, also form in the castings at the same time. In wrought products, the formation of macro-segregation, freckles, laves phase, and white spots results in a large scatter in the mechanical properties.…”

Section: Microstructuresmentioning

confidence: 99%

Review on powder-bed laser additive manufacturing of Inconel 718 parts

Wang

Gong

Chou

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

199

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This study presents a thorough literature review on the powder-bed laser additive manufacturing processes such as selective laser melting of Inconel 718 parts. This article first introduces the general aspects of powder-bed laser additive manufacturing and then discusses the unique characteristics and advantages of selective laser melting. The bulk of this study includes extensive discussions of microstructures and mechanical properties, together with the application ranges of Inconel 718 parts fabricated by selective laser melting.

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Section: Microstructuresmentioning

confidence: 99%

Review on powder-bed laser additive manufacturing of Inconel 718 parts

Wang

Gong

Chou

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

199

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“…The effect of the addition of P and B on IN718 alloy as-cast microstructure was studied; the results indicated that the addition of these two alloying elements promoted the formation of a blocky Laves phase. A low melting B-bearing phase enriched in Nb, Mo, and Cr was observed [8]. Xin et al investigated the effect of Co on precipitation behaviors of IN718 alloy, and the results showed Co was slightly segregated in the dendrite core and markedly increased the solubility of Mo in the dendrite core which resulted in reduced Mo in the residual liquid.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the lack of information of the influence of V on the solidification structure of IN718 alloy during laser cladding, this was our goal in this study. The previous work [7,8,9,10] on the influence of alloying elements on IN718 alloy focused on the solidification and precipitation behaviors. However, macroscopic and microscopic features were not compared between the sample with alloying elements and the blank sample.…”

Section: Introductionmentioning

confidence: 99%

Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding

et al. 2019

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A deleterious Laves phase forms in the solidified structure of Inconel 718 (IN718) alloy during laser cladding. However, effective removal methods have not yet been identified. In this study, we first added the IN718 alloy cladding layers with a trace amount of vanadium (V, 0.066 wt.%). Then, we studied the solidification structure of cladding layers using a confocal laser scanning microscope and scanning electron microscopy. The microstructure and Laves phase morphology were investigated. The distribution of niobium (Nb) was observed by experiment as well. We found that V is evenly distributed in dendrites and interdendritic zones. A more refined dendrite structure, reduced second dendrite arm spacing and lower volume fraction of Laves phase were observed in the solidification structure. The results of linear energy-dispersive X-ray spectroscopy (EDS) indicate that the concentration of Nb decreases with an increasing of the distance from the Laves phase. The V-containing sample displayed a relatively slower decreasing tendency. The IN718 alloy sample was harder with the addition of V. In addition, the porosity of the sample decreased compared with the blank sample. The presented findings outline a new method to inhibit the Nb segregation in IN718 alloy during laser cladding, providing reference significance for improving the performance of IN718 alloy samples during actual processing.

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“…According to Jones et al, variations in Nb, Cr, and Fe percent composition of alloy 718 were found to affect segregation of phase precipitation, the least segregated alloy was low in Nb, Cr, and Fe concentrations . The addition of P and B promoted the precipitation of lumpy Laves phase, and made the homogenization temperature reduce by 40 K . The effect of Co, Zr, and Cu in alloy 718 was also studied; results showed that the Co content should be strictly limited, and suitable Zr or Cu concentrations was conducive to improving the precipitated phases in grains .…”

Section: Introductionmentioning

confidence: 99%

Effect of Vanadium on the Solidification and Homogenization Behaviors in Inconel 718 Alloy

Wang

Jiang

et al. 2016

Adv Eng Mater

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Effect of vanadium (V) on the solidification and homogenization behaviors in Inconel 718 alloy is investigated. V is observed to evenly distribute in dendritic and interdendritic zones, and slightly increase niobium (Nb) and molybdenum (Mo) segregation coefficients. However, Laves phase volume fraction reduces from 2.3 to 0.4%, indicating that V may effectively prevent the precipitation of Laves phase. Homogenization results show that diffusion coefficient of Nb is much higher in the V-containing alloy, and it takes fewer hours to remove Laves phase, which suggest that microalloying of V can be very helpful in ingots homogenization annealing of Inconel 718 alloy in industry production.

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Effects of P and B addition on as-cast microstructure and homogenization parameter of Inconel 718 alloy

Cited by 20 publications

References 14 publications

Review on powder-bed laser additive manufacturing of Inconel 718 parts

Review on powder-bed laser additive manufacturing of Inconel 718 parts

Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding

Effect of Vanadium on the Solidification and Homogenization Behaviors in Inconel 718 Alloy

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