High Temperature Stress Rupture Anisotropy of a Ni-Based Single Crystal Superalloy. Issue 10 (October 2016)

• Record Type: Journal Article
• Authors: Wang, Guanglei; Liu, Jinlai; Liu, Jide; Jin, Tao; Sun, Xiaofeng; Sun, Xudong; Hu, Zhuangqi
• Is Part Of: Journal of materials science & technology. Volume 32:Issue 10(2016:Oct.)
• Page Start: 1003
• Page End: 1007
• Publication Date: 2016-10
• Subjects: Ni-based single crystal superalloy -- Stress rupture property -- Anisotropy -- Microstructure characterization -- Deformation mechanism; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2016.08.018
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract : High temperature stress rupture anisotropies of a second generation Ni-base single crystal (SC) superalloy specimens with [001], [011] and [111] orientations under 900 °C/445 MPa and 1100 °C/100 MPa have been investigated in the present study, with attentions to the evolution of γ/γ′ microstructure observed by scanning electron microscopy and the dislocation configuration characterized by transmission electron microscopy in each oriented specimen. At 1100 °C/100 MPa as well as 900 °C/445 MPa, the single crystal superalloy exhibits obvious stress rupture anisotropic behavior. The [001] oriented specimen has the longest rupture lifetime at 900 °C/445 MPa, and the [111] oriented sample shows the best rupture strength at 1100 °C/100 MPa. While the [011] oriented specimen presents the worst rupture lifetime at each testing condition, its stress rupture property at 1100 °C/100 MPa is clearly improved, compared with 900 °C/445 MPa. The evident stress rupture anisotropy at 900 °C/445 MPa is mainly attributed to the distinctive movement way of dislocations in each oriented sample. Whereas, at 1100 °C/100 MPa, together with the individual dislocation configuration, the evolution of γ/γ′ microstructure in each orientation also plays a key role in the apparent stress rupture anisotropy.