Casting & Forming through Hot Isostatic Press [HIP]
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Transcript of Casting & Forming through Hot Isostatic Press [HIP]
Sharath C M
Introduction Isostatic Press
Cold Isostatic Press (CIP)
Hot Isostatic Press (HIP)
Advantages & applications.
Process considerations & parameters.
Effect of Mechanical properties on cast products on HIP
o On alloy IN738, Titanium , Aluminium alloys, Stainless steels
Case studies on various materials & tools showing possible improvements
in their mechanical property & work ability.
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Isostatic pressing applies a uniform, equal force over the entire product, regardless of shape or size.
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Cold isostatic pressing (CIP) Warm isostatic pressing (WIP) Hot isostatic pressing (HIP)
Isostatic pressing is generally used to produce large PM parts to near-net shapes of varied complexity.
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compaction pressure provides;• Density by there by porosity.• Localized deformation allowing new contacts
to be formed between particles
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• Temperature: 200°C–425°C to remove adsorbed moisture
• HIP process is rather slow, and a cycle may take 10 to 15 h,depends on part size, material, and furnace design.
Advantages:
Uniform strength in all directions
Uniform density Shape flexibility Component size
Larger parts Enhance alloying possibilities
Reduced lead times Material and machining costs
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CIP PM:
High green strength Difficult to press materials
HIP PM:
Improved mechanical properties
Isotropic Properties Predictability
Wear/corrosion resistance
Diffusion bonding Reduction in welds
Expensive Material Reduction
HOT Isostatic Pressing of casting:
Predictability Mechanical properties
Improved surface finish
Extended service life
Opens new markets Salvage Quality cost Manufacturing costs
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Material considerations for avoiding such harmful effects as• Initial melting• Grain growth• Degradation of constituent phases such as carbides
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Additional process considerations:• Gas Purity• Distortion of castings• Surface defect• Casting Salvage• Post-HIP Heat Treatment
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For alloy IN738
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For alloy IN738
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For alloy IN738
Stress rupture properties of IN738 hot isostatically pressed at 1205 C and 103 MPa for 4 hours.
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For Titanium
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For Titanium
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For Aluminium alloys- A356
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For Aluminium alloys- A356
HIP conditions: 520 °C and 103 MPa for 2 hours. Stress-controlled test on axially loaded specimen; maximum stress ratio R=0.1, frequency = 60 Hz, theoretical stress concentration factor Kt=1.0.
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For Stainless Steel
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Al-7Si-Mg alloy castings were subjected to a HIPing treatment of 100 MPa at 500 C for 6 hours
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Thus, HIPed material are safe and holds necessary superior mechanical properties for most of the small, moderate & bulk applications with high factor of safety.
HIPed cast or formed materials possess superior strength & toughness hence it is the widely scoped metallurgical casting process with aid of high pressure & temperature.
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