About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Advanced Materials for Harsh Environments
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Presentation Title |
Microstructure and Mechanical Properties of Friction Stir Welded Haynes 282 |
Author(s) |
Mageshwari Komarasamy, Christopher Smith, Jens Darsell, Woongjo Choi, Saumyadeep Jana, Anand Kulkarni, Kyle Stoodt, Glenn Grant |
On-Site Speaker (Planned) |
Mageshwari Komarasamy |
Abstract Scope |
Advanced ultrasupercritical (A-USC) steam plants are designed to operate at high temperatures and pressures due to the necessity for higher operational efficiency. The extreme operating conditions of A-USC requires the deployment of precipitation strengthened Ni-base alloys that exhibit elevated temperature strength and good fabricability. In the current study, friction stir welding, a solid state joining technique was implemented on a precipitation strengthened nickel-based superalloy, Haynes 282. Detailed microstructural and mechanical properties characterization was carried out. The processed region exhibited wrought, fine-grained microstructure, absence of weld defects and elemental segregation. Both hardness and cross-weld tensile tests demonstrated that the weld region was stronger than the base material. And the cross-weld tensile samples failed in the base material. Based on weld strength reduction factor analysis, friction stir welded Haynes 282 outperformed fusion welds. Furthermore, creep performance of the cross-welded samples was comparable to the base material. |