Microstructure and mechanical properties of friction stir processed cast Alloy 718
- Jasthi B.K. ,
- Chen E.Y. ,
- Arbegast W.J. ,
- et al
- Jasthi B.K. ,
- Chen E.Y. ,
- Arbegast W.J. ,
- Kaligotla B. ,
- West M. ,
- Widener C.A. and
- Howard S.M.
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Description
An experimental investigation was conducted into the effects of friction stir processing (FSP) and post-FSP ageing on the microstructure and mechanical properties of Alloy 718 castings. Bead-on-plate welds were fabricated on cast Alloy 718 sheets (thickness 5 mm) using an MTS-/"stir-10" friction stir welding system with high-temperature pin tools made from polycrystalline cubic BN and featuring a convex shoulder step spiral design. PWHT cycles incorporated homogenisation, solution treatment and precipitation in an argon atmosphere. Microstructure was observed by optical microscopy and SEM. Mechanical properties were characterised by Vickers microhardness measurements in the dynamically recrystallised region of the weld nugget, transverse and longitudinal all-weld tensile tests and compact tension fatigue crack growth tests.
9th International Symposium, 15-17 May 2012, Session 8A: Nickel Alloys, Paper 02
Subjects
- Surface engineering
- Process
- Friction stir processing
- Nonferrous
- Material
- Nickel and Ni alloys
- Microstructure
- Grain
- Weld zone
- Weld
- Dynamically recrystallised zone
- Heat treatment
- PWHT
- Mechanical properties
- Properties
- Hardness
- Strength
- Ultimate tensile strength
- Cracking
- Defects
- Fatigue cracks
- Castings
- Parent material
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