Multi-component solid solution hardening

Gypen, L. A.; Deruyttere, A.

doi:10.1007/bf00540988

Cited by 141 publications

(32 citation statements)

References 10 publications

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“…Microstructure and chemical analysis on as deposited samples are used to verify the solidification conditions and the validity of the hypothesis. Gypen and Deruyttere's model for multicomponent solid solution hardening [24] is then used to design a modified version of Hastelloy X with increased lattice strength; with the intention of increasing the TSR of the alloy and reducing micro-crack formation.…”

Section: Rapid Solidification and Microstructurementioning

confidence: 99%

Reduction of micro-cracking in nickel superalloys processed by Selective Laser Melting: A fundamental alloy design approach

2015

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The Selective Laser Melting (SLM) process generates large thermal gradients during rapid melting of metallic powdered feedstock. During solidification certain alloys suffer from thermally induced micro-cracking which cannot be eliminated by process optimisation. An alloy's crack susceptibility may reduce by increasing its Thermal Shock Resistance (TSR), potentially achieved through an increase in tensile strength. This hypothesis is investigated with Hastelloy X, a common nickel-base superalloy of known high crack susceptibility when processing SLM. It is demonstrated that through consideration of the imposed rapid solidification conditions, Hastelloy X can be made to form a supersaturated solid solution in the as deposited state. The fundamental solid solution strengthening (SSS) effect is exploited to generate an increase in lattice stress, by increasing the most potent SSS elements present within the alloy, whilst maintaining specification composition. The modified alloy displayed a 65% reduction in cracking and an increase in elevated temperature tensile strength, lending support to the initial hypothesis and identifying a possible approach for developing further SLM crack resistant versions of well-known alloy compositions.

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Section: Rapid Solidification and Microstructurementioning

confidence: 99%

Reduction of micro-cracking in nickel superalloys processed by Selective Laser Melting: A fundamental alloy design approach

2015

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“…Notably, these two values [43] comfortably straddle the yield strength of pure titanium at room temperature. [42] The genetic algorithm model has solved for the average (i.e., orientation independent) intrinsic yield strength of pure hcp titanium and gives a value of 89 MPa. This value is not only very close to the value of 78.45 MPa given in source [42] but also does not, as of yet, consider texture.…”

Section: A Intrinsic Flow Strengthmentioning

confidence: 99%

“…[42] The genetic algorithm model has solved for the average (i.e., orientation independent) intrinsic yield strength of pure hcp titanium and gives a value of 89 MPa. This value is not only very close to the value of 78.45 MPa given in source [42] but also does not, as of yet, consider texture. Thus, the extracted value of 89 MPa is a reasonable value of r O a.…”

Section: A Intrinsic Flow Strengthmentioning

confidence: 99%

A Constitutive Equation Relating Composition and Microstructure to Properties in Ti-6Al-4V: As Derived Using a Novel Integrated Computational Approach

Ghamarian

Samimi

Dixit

et al. 2015

Metall Mater Trans A

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While it is useful to predict properties in metallic materials based upon the composition and microstructure, the complexity of real, multi-component, and multi-phase engineering alloys presents difficulties when attempting to determine constituent-based phenomenological equations. This paper applies an approach based upon the integration of three separate modeling approaches, specifically artificial neural networks, genetic algorithms, and Monte Carlo simulations to determine a mechanism-based equation for the yield strength of a+b processed Ti-6Al-4V (all compositions in weight percent) which consists of a complex multi-phase microstructure with varying spatial and morphological distributions of the key microstructural features. Notably, this is an industrially important alloy yet an alloy for which such an equation does not exist in the published literature. The equation ultimately derived in this work not only can accurately describe the properties of the current dataset but also is consistent with the limited and dissociated information available in the literature regarding certain parameters such as intrinsic yield strength of pure hexagonal close-packed alpha titanium. In addition, this equation suggests new interesting opportunities for controlling yield strength by controlling the relative intrinsic strengths of the two phases through solid solution strengthening.

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“…The solid solution strengthening due to multiple alloying elements in Ni alloys has been investigated [47] and the strengthening can be expressed by the following relation…”

Section: Solid Solution Strengtheningmentioning

confidence: 99%

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

Pasebani

Dutt

Burns

et al. 2015

Materials Science and Engineering: A

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Oxide dispersion strengthened (ODS) nickel based alloys were developed via mechanical milling and spark plasma sintering (SPS) of Ni-20Cr powder with additional dispersion of 1.2 wt.% Y 2 O 3 powder. Furthermore, 5 wt.% Al 2 O 3 was added to Ni-20Cr-1.2Y 2 O 3 to provide composite strengthening in the ODS alloy. The effects of milling times, sintering temperature, and sintering dwell time were investigated on both mechanical properties and microstructural evolution. A high number of annealing twins was observed in the sintered microstructure for all the milling times.However, longer milling time contributed to improved hardness and narrower twin width in the consolidated alloys. Higher sintering temperature led to higher fraction of recrystallized grains, improved density and hardness. Adding 1.2 wt.% Y 2 O 3 to Ni-20Cr matrix significantly reduced the grain size due to dispersion strengthening effect of Y 2 O 3 particles in controlling the grain boundary mobility and recrystallization phenomena. The strengthening mechanisms at room temperature were quantified based on both experimental and analytical calculations with a good agreement. A high compression yield stress obtained at 800 °C for Ni-20Cr-1.2Y 2 O 3 -5Al 2 O 3 alloy was attributed to a combined effect of dispersion and composite strengthening.

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Multi-component solid solution hardening

Cited by 141 publications

References 10 publications

Reduction of micro-cracking in nickel superalloys processed by Selective Laser Melting: A fundamental alloy design approach

Reduction of micro-cracking in nickel superalloys processed by Selective Laser Melting: A fundamental alloy design approach

A Constitutive Equation Relating Composition and Microstructure to Properties in Ti-6Al-4V: As Derived Using a Novel Integrated Computational Approach

Oxide dispersion strengthened nickel based alloys via spark plasma sintering

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