材料科学
焊接
冶金
液化
高温合金
微观结构
熔焊
极限抗拉强度
母材
搅拌摩擦焊
延展性(地球科学)
拉伸试验
复合材料
作者
Mageshwari Komarasamy,Chris Smith,Jens T. Darsell,Woongjo Choi,Saumyadeep Jana,Glenn J. Grant
标识
DOI:10.1016/j.matchar.2021.111558
摘要
Advanced ultra-supercritical (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. Fusion welding of precipitation strengthened nickel alloys lead to solidification cracking in fusion zone and/or liquation cracking in heat affected zone. Therefore, an alternative non-melting welding technique is a necessity to efficiently join nickel alloys. 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 such as voids and cracks and absence of 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 joint efficiency analysis, friction stir welded Haynes 282 outperformed fusion welds. • Temperature controlled FSW of Haynes 282 resulted in defect-free weld. • Grain size and second phase modification were observed in the weld region. • Highest hardness was noted in the processed region. • Cross-weld tensile test resulted in base metal deformation and failure.
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