Effect of substituting Mo for W on γ/γ′ partitioning behaviors of alloying elements in heat-treated second generation Ni based single crystal superalloys: An atom probe tomography study. (July 2021)

• Record Type: Journal Article
• Authors: Ai, Cheng; Li, Qing; Zhang, Jun; Su, Haijun; Yang, Wenchao; Liu, Lin; Ru, Yi; Zhang, Heng; Song, Yuanyuan; Chen, Yongnan; Li, Shusuo; Gong, Shengkai
• Is Part Of: Intermetallics. Volume 134(2021)
• Publication Date: 2021-07
• Subjects: Ni based single crystal superalloy -- Substituting Mo for W -- Atom probe tomography (APT) -- γ/γ′ partitioning behaviors of alloying elements; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2021.107198
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The effect of substituting Mo for W on γ/γ′ partitioning behaviors of alloying elements in heat-treated second generation Ni based single crystal superalloys was investigated via atom probe tomography technique. Re, Cr, Co and Mo elements tended to distribute in γ phase, while Al, Ta and W elements tended to distribute in γ′ phase, and significant interfacial segregation was not found in experimental alloys. Moreover, substituting Mo for W obviously increased Re content in γ phase. Meanwhile, Re content in γ phase increased with increasing Mo + Cr content in single crystal superalloy, while Re content in γ′ phase decreased with increasing W + Ta content in single crystal superalloy. In addition, partitioning ratios of both W and Mo elements were positively correlated with Ta content in single crystal superalloy, and partitioning ratio of Ta element was inversely correlated with Ta/Al ratio in single crystal superalloy. Furthermore, substituting Mo for W increased the solid solution strength of γ phase but decreased the solid solution strength of γ′ phase. Highlights: Substituting Mo for W obviously increased Re content in γ phase. Re content in γ phase increased with Mo + Cr content in superalloy. Re content in γ′ phase decreased with increasing W + Ta content in superalloy. Substituting Mo for W increased the solid solution strength of γ phase. Substituting Mo for W decreased the solid solution strength of γ′ phase.