Effect of microstructural evolution and elevated temperature on the mechanical properties of Ni–Cr–Mo alloys

Karaköse, Ercan; Keskín, Mustafa

doi:10.1016/j.jallcom.2014.09.036

Cited by 25 publications

(12 citation statements)

References 33 publications

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“…For this reason, useful correlations can be developed that directly relate the microhardness of an alloy to cooling rate. shows such relationships between hardness and cooling rates for collected data on steels [61][62][63][64][65][66], aluminum alloys [67][68][69][70][71] and nickel alloys [72][73][74][75][76] in which plates or bars are cooled at controllable rates. The logarithmic scale on the horizontal axis shows that the cooling rates cover multiple orders of magnitudes.…”

Section: Cooling Ratesmentioning

confidence: 99%

“…In this sense, the AM produced materials behave in a manner similar to other conventional metals processing technologies. Submerged FSW ~20 [171] Fusion welding ~5 [172] Laser welding 10 0 to 10 5 [173] Fusion welding ~10 3 [119] Laser-based AM 10 3 to 10 4 [174] Laser-based AM 10 4 [18] Laser-based AM ~10 3 -10 4 [7] Laser-based AM 1.0 x 10 6 to 4.0 x 10 7 [175] [67][68][69][70][71] and (c) nickel alloys [72][73][74][75][76] in which no post-processing heat treatment was used. [81] showing (a) a longitudinal cross section (X-Z plane), (b) a transverse cross section (Y-Z plane), and (c) a horizontal cross section (X-Y plane) where X is the travel direction, Y is the track width direction, and Z is the build direction.…”

Section: (D)mentioning

confidence: 99%

“…Figure 4. Hardness data as a function of reported cooling rates for (a) steels [61][62][63][64][65][66], (b) aluminum alloys [67][68][69][70][71] and (c) nickel alloys [72][73][74][75][76] in which no post-processing heat treatment was used. Hardness variations as a function of location within a DED-L single pass, multilayer build of IN718 [81] showing (a) a longitudinal cross section (X-Z plane), (b) a transverse cross section (Y-Z plane), and (c) a horizontal cross section (X-Y plane) where X is the travel direction, Y is the track width direction, and Z is the build direction.…”

Section: (D)mentioning

confidence: 99%

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The Hardness of Additively Manufactured Alloys

DebRoy¹,

Zuback²

2018

Preprint

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The rapidly evolving field of additive manufacturing requires a periodic assessment of the progress made in understanding the properties of metallic components. Although extensive research has been undertaken by many investigators, the data on properties such as hardness from individual publications are often fragmented. When these published data are critically reviewed, several important insights that cannot be obtained from individual papers become apparent. We examine the role of cooling rate, microstructure, alloy composition, and post process heat treatment on the hardness of additively manufactured components. Hardness data for steels and aluminum alloys processed by additive manufacturing and welding are compared to understand the relative roles of manufacturing processes. Furthermore, the findings are useful to determine if a target hardness is easily attainable either by adjusting AM process variables or through appropriate alloy selection.

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Section: Cooling Ratesmentioning

confidence: 99%

Section: (D)mentioning

confidence: 99%

Section: (D)mentioning

confidence: 99%

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The Hardness of Additively Manufactured Alloys

DebRoy¹,

Zuback²

2018

Preprint

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“…Litao Chang et al [ 6 ] investigated the solidification behavior of 720Li superalloy, and pointed out that the formation of γ/γ-eutectic was related with the solute redistribution and enrichment of Al and Ti elements in the residual liquid. Ercan et al [ 8 ] reported that the final microstructures of superalloy mostly depended upon the cooling rate, and increasing cooling rate greatly improved the mechanical properties of the superalloy due to the reduction in the size of primary and secondary dendrites. The influence of solidification variables on porosity was also investigated by Whitesell [ 9 ], who pointed out that the size and total porosity level depended strongly upon the withdrawal velocity, and microporosity growth appeared to be limited by the secondary and tertiary dendrite arms.…”

Section: Introductionmentioning

confidence: 99%

Effect of Solidification Behavior on Microstructures and Mechanical Properties of Ni-Cr-Fe Superalloy Investment Casting

et al. 2017

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The effect of solidification behavior on the microstructures and mechanical properties of Ni-Cr-Fe superalloy investment casting is given. Metallographic and image analysis have been used to quantitatively examine the microstructures’ evolution. For the parts with the thickness of 3 mm and 24 mm, the volume fraction and maximum equivalent radius of the Laves phase increases from 0.3% to 1.2%, from 11.7 μm to 23.4 μm, respectively. Meanwhile, the volume fraction and maximum equivalent radius of carbides increase from 0.3% to 0.5%, from 8.1 μm to 9.9 μm, respectively. In addition, the volume fraction of microporosity increases from 0.3% to 2.7%. As a result, the ultimate tensile strength is reduced from 1125.5 MPa to 820.9 MPa, the elongation from 13.3% to 7.7%, and the quality index from 1294.2 MPa to 954.0 MPa, respectively. A typical brittle fracture is observed on the tensile fracture. As the cooling rate decreases, the microstructures become coarser.

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“…Ni-based alloys have been widely used as structural materials and in the aerospace industry because of their high temperature resistance and corrosion resistance [8][9][10]. If Cr and Ti are added to the Ni matrix, the fluidity and wettability of the alloys to cover the c-BN particles can be further improved, which results in a high melting point, and good mechanical properties of the Ni-based alloys.…”

Section: Introductionmentioning

confidence: 99%