The optimisation of processing parameters and characterisation of microstructure of direct laser fabricated TiAl alloy components

Srivastava, D.; Chang, I.T.H.; Loretto, M. H.

doi:10.1016/s0261-3069(99)00091-6

Cited by 63 publications

(27 citation statements)

References 5 publications

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“…In general, there are numerous parameters that need to be considered for the laser surface alloying process, such as laser power, scanning speed, gas flowrate, beam diameter, focal length, and powder paste thickness. However, previous works have shown power, speed, and powder paste thickness to be of most influential in terms of alloy quality [13][14][15][16]. To obtain the optimum laser processing parameters in this work, selected laser parameters were systemically varied; laser power, p, in the range of 600 to 900 W, scanning speed, v, in the range of 600 to 1200 mm/min, and powder paste thickness, t, in the range of 200 to 400 mm.…”

Section: Laser Surface Alloying Proceduresmentioning

confidence: 99%

Parametrical optimization of laser surface alloyed NiTi shape memory alloy with Co and Nb by the Taguchi method

Man

Lawrence

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part B:

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Different high-purity metal powders were successfully alloyed on to a nickel titanium (NiTi) shape memory alloy (SMA) with a 3 kW carbon dioxide (CO 2 ) laser system. In order to produce an alloyed layer with complete penetration and acceptable composition profile, the Taguchi approach was used as a statistical technique for optimizing selected laser processing parameters. A systematic study of laser power, scanning velocity, and pre-paste powder thickness was conducted. The signal-to-noise ratios (S/N) for each control factor were calculated in order to assess the deviation from the average response. Analysis of variance (ANOVA) was carried out to understand the significance of process variables affecting the process effects. The Taguchi method was able to determine the laser process parameters for the laser surface alloying technique with high statistical accuracy and yield a laser surface alloying technique capable of achieving a desirable dilution ratio. Energy dispersive spectrometry consistently showed that the per cent by weight of Ni was reduced by 45 per cent as compared with untreated NiTi SMA when the Taguchi-determined laser processing parameters were employed, thus verifying the laser's processing parameters as optimum.

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Section: Laser Surface Alloying Proceduresmentioning

confidence: 99%

Parametrical optimization of laser surface alloyed NiTi shape memory alloy with Co and Nb by the Taguchi method

Man

Lawrence

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…In the meantime, Srivastava et al have demonstrated that the heterogeneous microstructure of a laser fabricated Ti-48Al-2Mn-2Nb alloy was associated with the many thermal excursions as the successive layers are deposited 7 . For this particular alloy, the processing parameters that have significant effects on the quality of the component have been identified 8 . The amount of laser energy and the volume of powder were found to determine the stability of the build-up rate and therefore the uniformity of build geometry and quality 9 .…”

Section: ° Lmd or Cladding Processmentioning

confidence: 99%

The prospects for additive manufacturing of bulk TiAl alloy

Thomas

Malot

Aubry

et al. 2016

Materials at High Temperatures

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“…Thus, ALM offers great potential to produce geometrically intricate components with major savings in time, material, and hence cost [3,4]. Some work has been devoted to developing ALM processes for titanium aluminide alloys [5][6][7][8][9][10][11]. Compared to other production techniques, the GTAW-based ALM process offers several advantages, including high material use efficiency, high performance full density deposition, and the capability to economically produce large components.…”

Section: Introductionmentioning

confidence: 99%

Effect of Post Production Heat Treatment on γ‐Tial Alloys Produced by Gtaw‐ Based Additive Manufacturing Process

Ma¹,

Cuiuri²,

Shen³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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In this work, an additive layer manufacturing (ALM) process based on gas tungsten arc welding (GTAW) was used to produce simple 3-dimensional titanium aluminide components, which were successfully in-situ alloyed by separately delivering elemental Al and Ti wires to the weld pool. Investigations were conducted on the additively manufactured -TiAl based alloy to assess the influence of heat treatment on the microstructure evolution, phase transformations and some other basic properties. The results indicated that heat treatment promotes the formation of the phase. This microstructural change resulted in the reduction of the microhardness mainly due to the reduction of the hard, brittle 2 phase.

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The optimisation of processing parameters and characterisation of microstructure of direct laser fabricated TiAl alloy components

Cited by 63 publications

References 5 publications

Parametrical optimization of laser surface alloyed NiTi shape memory alloy with Co and Nb by the Taguchi method

Parametrical optimization of laser surface alloyed NiTi shape memory alloy with Co and Nb by the Taguchi method

The prospects for additive manufacturing of bulk TiAl alloy

Effect of Post Production Heat Treatment on γ‐Tial Alloys Produced by Gtaw‐ Based Additive Manufacturing Process

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