Effect of gravity on dimensional change during sintering—II. Shape distortion

Olevsky, Eugene A.; German, Randall M.; Upadhyaya, Anish

doi:10.1016/s1359-6454(99)00369-9

Cited by 65 publications

(47 citation statements)

References 13 publications

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“…From this, they simulated component distortion during LPS for tungsten alloys in microgravity and ground-based sintering conditions. • Olevsky et al [220] also used FEM with a continuum theory of sintering to predict shape distortion caused by gravity in LPS of a W-Ni-Fe powder system. • Kraft [221] used an optimization algorithm for compaction and LPS to predict and minimize the distortion as a result of inhomogeneous density distributions in the green body.…”

Section: Finite Element Methodsmentioning

confidence: 99%

Review: liquid phase sintering

2009

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Liquid phase sintering (LPS) is a process for forming high performance, multiple-phase components from powders. It involves sintering under conditions where solid grains coexist with a wetting liquid. Many variants of LPS are applied to a wide range of engineering materials. Example applications for this technology are found in automobile engine connecting rods and high-speed metal cutting inserts. Scientific advances in understanding LPS began in the 1950s. The resulting quantitative process models are now embedded in computer simulations to enable predictions of the sintered component dimensions, microstructure, and properties. However, there are remaining areas in need of research attention. This LPS review, based on over 2,500 publications, outlines what happens when mixed powders are heated to the LPS temperature, with a focus on the densification and microstructure evolution events.

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Section: Finite Element Methodsmentioning

confidence: 99%

Review: liquid phase sintering

2009

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“…Taking the linear elastic-linear viscous analogy one step further, an equivalent set of constitutive equations for isotropic linear viscous behavior is [13]:…”

Section: Constitutive Equations For Sinteringmentioning

confidence: 99%

“…The measured viscosity is used to characterize the constitutive equations of sintering for a linear viscous porous solid as setup by Olevsky [13]. These equations are then used to simulate the in situ bending during sintering in a finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Critical use of video-imaging to rationalize computer sintering simulation models

Blaine

Bollina

Park

et al. 2005

Computers in Industry

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“…In the past few years continuum modeling has gained relevance in this aspect via the efforts of Ashby, 1) McMeeking & Kuhn, 2) Olevsky et al, 3) Riedel et al, 4) McHugh and Riedel, 5) Bouvard and Meister, 6) Cocks, 7) and Bordia and Schrerer. 8) Modeling efforts based on constitutive laws of deformation offer insights to the scientific community and are capable of providing solutions and in-line monitoring tools for manufacturers.…”

Section: Introductionmentioning

confidence: 99%

“…Ganesan et al 12) and Binet et al 13) considered a densified LPS component to be a viscous mass and modeled distortion behavior using Navier-Stokes equations. Olevsky et al 3) considered the effect of gravity and friction on distortion assuming that the material obeys power law creep behavior under uniaxial loading. However, in liquid phase sintering the effect of surface tension as well as gravity and friction should be included to give better predictions of actual distortion behavior.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation of Liquid Phase Sintering with Tungsten Heavy Alloys

Park

Chung²,

Johnson

et al. 2006

Mater. Trans.

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Densification and distortion of W-Ni-Fe tungsten heavy alloys during liquid phase sintering are modeled using constitutive laws of grain growth, densification, and deformation. The models are ''calibrated'' via carefully designed experiments to obtain the necessary parameters to enable modeling. Metallographic analysis of quenched samples is used to obtain grain size data as functions of time and temperature, while dilatometry and dimensional analyses are used to determine the bulk viscosity and shear viscosity. The influences of gravity, substrate friction, surface tension, and solid content on distorted shapes are shown by comparing predictions from the finite element method with experimentally measured shapes. The finite element simulations accurately predict several phenomena, including increased distortion with longer sintering times and higher liquid contents, slumping due to gravity, spheroidization due to surface tension, and friction-related distortion due to sticking of the part to the substrate.

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Effect of gravity on dimensional change during sintering—II. Shape distortion

Cited by 65 publications

References 13 publications

Review: liquid phase sintering

Review: liquid phase sintering

Critical use of video-imaging to rationalize computer sintering simulation models

Finite Element Simulation of Liquid Phase Sintering with Tungsten Heavy Alloys

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