Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding

Bhattacharyya, Dhriti; Davis, Joel; Drew, Michael; Harrison, Robert; Edwards, L.

doi:10.1016/j.matchar.2015.05.001

Cited by 35 publications

(7 citation statements)

References 11 publications

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“…In addition to the significantly different alloy matrix microstructures, it is clear from present EDS maps that the morphology and distribution of precipitates is considerably different in weld-metal and parent-metal regions. These precipitates have been identified as complex carbides of the form (Ni,Mo,Cr)6(Si,C), i.e., M6C [58,59]. The parent metal features M6C carbides arranged in stringers parallel to the hot-rolling direction (i.e., parallel to the x (TD) and z (LD) axes, see Fig.…”

Section: Effect Of Alloy Microstructure On Molten Salt Corrosionmentioning

confidence: 99%

Molten salt corrosion (FLiNaK) of a Ni–Mo–Cr alloy and its welds for application in energy-generation and energy-storage systems

et al. 2020

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Section: Effect Of Alloy Microstructure On Molten Salt Corrosionmentioning

confidence: 99%

Molten salt corrosion (FLiNaK) of a Ni–Mo–Cr alloy and its welds for application in energy-generation and energy-storage systems

et al. 2020

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“…Different ratios of MoSi 2 , Si, and Cr powders were weighted according to the compositions listed in Table 1, the mixture powder was ball milling and was pressed into disks, then the disks were heated to 1673 K for 1-2 h at the rate of 10 K•min -1 to obtain pre-melted alloy blocks with uniform compositions [30,31].…”

Section: Alloy Powder Pre-melt Processmentioning

confidence: 99%

High temperature mechanical retention characteristics and oxidation behaviors of the MoSi2(Cr5Si3)—RSiC composites prepared via a PIP—AAMI combined process

et al. 2019

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In the present paper, MoSi 2 (Cr 5 Si 3)-RSiC composites were prepared via a combination of precursor impregnation pyrolysis (PIP) and MoSi 2 −Si−Cr alloy active melt infiltration (AAMI) process. Composition, microstructure, mechanical retention characteristics, and oxidation behaviors of the composites at elevated temperature were studied. X-ray diffraction (XRD) pattern confirms that the composites mainly compose of 6H-SiC, hexagonal MoSi 2 , and tetragonal Cr 5 Si 3. Scanning electron microscopy (SEM) image reveals that nearly dense MoSi 2 (Cr 5 Si 3)-RSiC composites exhibiting three-dimensionally (3D) interpenetrated network structure are obtained when infiltrated at 2173 K, and the interface combination of the composites mainly depends on the composition ratio of infiltrated phases. Oxidation weight gain rate of the composites is much lower than that of RSiC matrix, where MoSiCr2 possesses the lowest value of 0.1630 mg⋅cm −2 , about 78% lower than that of RSiC after oxidation at 1773 K for 100 h. Also, it possesses the highest mechanical values of 139.54 MPa (flexural strength σ f and RT) and 276.77 GPa (elastic modulus E f and RT), improvement of 73.73% and 29.77% as compared with that of RSiC, respectively. Mechanical properties of the composites increase first and then decrease with the extension of oxidation time at 1773 K, due to the cooperation effect of surface defect reduction via oxidation reaction and thermal stress relaxation in the composites, crystal growth, and thickness increase of the oxide film. Fracture toughness of MoSiCr2 reaches 2.24 MPa•m 1/2 (1673 K), showing the highest improvement of 31.70% as compared to the RT value.

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“…The alloy has good high-temperature performance and can be used for a long time under 900 ○ C. It is mainly used to fabricate blades, combustor parts and other high-temperature components of aeroengine. Although there have been many researches carried out on the Hastelloy series alloys up to date, most of them were focused on traditional preparation routes of these alloys, such as rolling and casting [1][2][3][4]. In this study, selective laser melting (SLM) method was used to prepare Hastelloy X alloy components.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hot Isostatic Pressing on Microstructure and Mechanical Properties of Hastelloy X Samples Produced by Selective Laser Melting

Li¹,

Qi²,

Hou³

et al. 2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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Abstract. Hot isostatic pressing (HIP) with two different temperatures of 1100○ C/160MPa/2h and 1175 ○ C/160 MPa/2 h was performed on Hastelloy X samples produced by selective laser melting (SLM) was performed. The effect of hot isostatic pressing on defects, microstructures and mechanical properties of SLM fabricated Hastelloy X samples were investigated. It showed that cracks and micro-pores on within SLM-fabricated samples were gradually eliminated with the increase of HIP temperatures, increased A in which nearly fully dense part can be achieved at hot isostatic pressing of 1175 ○ C /160 MPa/2 h. The microstructure evolution rule as follows: cellular crystal in both horizon and vertical directions, no precipitates (as-deposited) → equiaxed crystal with size of 10-50 μm in horizon direction and columnar crystal with size of 200μm in vertical direction, chain-like precipitates distributed at grain boundaries (1100 ○ C/160 MPa/2 h HIP processed) → equiaxed crystal with size of 150 μm in both horizon and vertical directions, plate-like precipitates distributed at grain boundaries with size triple increased (1175 ○ C/160 MPa/2 h HIP processed). Ductile fracture occurred in both SLM deposited and HIP processed samples during room temperature tensile tests, while all tested samples behaved higher mechanical properties than traditional wrought parts. The room temperature tensile properties of the as-deposited and the two HIP processed samples all reached the standard for wrought Hastelloy X. Moreover, the ductility of HIP processed samples enhanced and tensile properties decreased compared with SLM deposited samples.

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Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding

Cited by 35 publications

References 11 publications

Molten salt corrosion (FLiNaK) of a Ni–Mo–Cr alloy and its welds for application in energy-generation and energy-storage systems

Molten salt corrosion (FLiNaK) of a Ni–Mo–Cr alloy and its welds for application in energy-generation and energy-storage systems

High temperature mechanical retention characteristics and oxidation behaviors of the MoSi2(Cr5Si3)—RSiC composites prepared via a PIP—AAMI combined process

Effects of Hot Isostatic Pressing on Microstructure and Mechanical Properties of Hastelloy X Samples Produced by Selective Laser Melting

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