Experimental and finite element simulation study of capsule-free hot isostatic pressing of sintered gears

Sundaram, Maheswaran Vattur; Khodaee, Alireza; Andersson, Michael; Nyborg, Lars; Melander, Arne

doi:10.1007/s00170-018-2623-4

Cited by 8 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As one of the coulomb friction models, the stick-slip friction model can reflect the stick-slip behavior of the contact surface better. Because of the obvious viscoelastic plasticity of powder under high temperature and high pressure, the stick-slip friction model is selected to describe the friction relationship between the powder and the capsule in this study, so as to describe the actual friction phenomenon more precisely [9,10]. Finite element mesh and the initial relative density of simulationⅡ…”

Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

A Numerical Simulation of the Hot Isostatic Pressing of Ti-6Al-4V powder considering the uneven powder distribution

Fang¹,

Li²

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In the process of powder hot isostatic pressing (HIP), there is always an error between the actual shrinkage of powder and the predicted value of numerical simulation. To explore the cause of this error, a numerical model is established to simulate the HIP process. The initial relative density of the powder is usually set to 0.65, which we think is the main reason for the error. So in this simulation, the initial relative density is subdivided into 4 gradients to simulate the uneven distribution in the capsule. By comparing the simulation and experiment results, we find that different relative densities have a great influence on the final powder densification. The maximum error of the simulation with the usual initial relative density setting of 0.65 is 4.2%. However, considering the uneven distribution of initial powder, the maximum error is reduced to 3.16%, and the average error is also less than 2%

show abstract

Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

A Numerical Simulation of the Hot Isostatic Pressing of Ti-6Al-4V powder considering the uneven powder distribution

Fang¹,

Li²

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…As one of the Coulomb friction model, the stick slip friction model [34,35] reflects the stick slip behavior of the contact surface better. Because of the obvious viscoelastic plasticity of powder under high temperature and high pressure, the stick slip friction model is selected to describe the friction relationship between the powder and the capsule in this study to describe the actual friction phenomenon more precisely [10,36].…”

Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

Comparative Analysis of the Hot Isostatic Pressing Densification Behavior of Uniform and Non-Uniform Distributed Powder

Meng

Xiao

2023

Metals

View full text Add to dashboard Cite

Hot isostatic pressing (HIP) technology can directly produce nearly clean shaped workpieces that meet the requirements while ensuring machining accuracy and surface quality. Usually, people use numerical simulation methods to reduce experimental costs. Generally, a uniform powder relative density distribution of about 65% is used in the simulation. However, in practical engineering, we found that even with additional tools such as vibration tables, the powder filling is not uniform. The non-uniform distribution causes uneven shrinkage of the powder and capsule after HIP. In this paper, a numerical model for HIPing of Ti-6Al-4V powder is developed to improve the prediction by comparing the uniform and non-uniform initial powder distribution. The results show that different initial relative density distributions affect the powder densification process and further affect the deformation of the capsule. It also leads to non-uniform stress distribution after HIP, which increases the risk of capsule rupture. The analysis of the numerical simulation results and the comparison with the experimental results highlights that taking into account the non-uniform powder distribution inside the capsule is vital to improve numerical results and produce near-net shape components. The maximum error of the simulation with the usual initial relative density setting of 65% is 4.2%. However, considering the uneven distribution of initial powder, the maximum error is reduced to 3.16%, and the average error is also less than 2%.

show abstract

“…14 Moreover, conventional PM technologies relying on only press and sinter are unable to provide near full densification, which prevents them from meeting demands on highest performance parts. 1 Other PM processing routes such as double-press/ double-sinter (DPDS), 15 powder forging (PF), 5 highvelocity compaction (HVC), 16 copper infiltration (CI), 17 cold isostatic pressing (CIP), 18 and hot isostatic pressing 19 have been developed to achieve high densification towards closed porosity or even full theoretical density. Powder consolidation by means of HIP utilizes a capsule in which powder is filled, which enables making fully dense parts weighing from less than 100 g to 30 ton.…”

Section: Introductionmentioning

confidence: 99%

Consolidation of water-atomized chromium–nickel-alloyed powder metallurgy steel through novel processing routes

Nagaram,

Sundaram,

Gårdstam

et al. 2024

Powder Metallurgy

Self Cite

View full text Add to dashboard Cite

When processing powder metallurgy (PM) steels, the conventional press and sinter route can reach a relative density up to 95%, which is insufficient for applications when dynamic mechanical performance is critical. In this study, a novel route is demonstrated consisting of cold isostatic pressing (CIP) followed by sintering and capsule-free hot isostatic pressing (HIP), allowing to achieve full density PM steels. Water-atomized steel powder admixed with 2 wt.% Ni was subjected to CIP and followed by sintering in 90N2/10H2 atmosphere at 1120 and 1250°C, and in vacuum (10−2 mbar) at 1250 and 1350°C, respectively. At the highest explored CIP pressure of 600 MPa, the three high-temperature sintering runs at 1250°C in 90N2/10H2 atmosphere and vacuum, and 1350°C in vacuum resulted in relative density of ∼94% and closed surface pores. This condition with necessary closed porosity then allowed subsequent capsule-free HIP after sintering, resulting in full densification of the components.

show abstract

Experimental and finite element simulation study of capsule-free hot isostatic pressing of sintered gears

Cited by 8 publications

References 18 publications

A Numerical Simulation of the Hot Isostatic Pressing of Ti-6Al-4V powder considering the uneven powder distribution

A Numerical Simulation of the Hot Isostatic Pressing of Ti-6Al-4V powder considering the uneven powder distribution

Comparative Analysis of the Hot Isostatic Pressing Densification Behavior of Uniform and Non-Uniform Distributed Powder

Consolidation of water-atomized chromium–nickel-alloyed powder metallurgy steel through novel processing routes

Contact Info

Product

Resources

About