Competing Modes for Crack Initiation from Non-metallic Inclusions and Intrinsic Microstructural Features During Fatigue in a Polycrystalline Nickel-Based Superalloy

2018 ◽  
Vol 49 (9) ◽  
pp. 3865-3873 ◽  
Author(s):  
Jean-Charles Stinville ◽  
Etienne Martin ◽  
Mallikarjun Karadge ◽  
Shak Ismonov ◽  
Monica Soare ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Polycrystalline Nickel ◽  
Nickel Based Superalloy ◽  
Metallic Inclusions

Analysis of the Crack Initiation at Non-Metallic Inclusions in High-Strength Steels

2012 ◽  
Vol 49 (8) ◽  
pp. 468-479 ◽  
Author(s):  
P. Grad ◽  
B. Reuscher ◽  
A. Brodyanski ◽  
M. Kopnarski ◽  
E. Kerscher
Keyword(s):  
Crack Initiation ◽  
High Strength Steels ◽  
High Strength ◽  
Metallic Inclusions

scholarly journals Strain rate and oxidation effects on crack initiation at 600 and 650 °C in a nickel-based superalloy

2016 ◽  
Vol 33 (3) ◽  
pp. 241-247
Author(s):  
M. Perrais ◽  
A. Seror ◽  
A. Burteau ◽  
E. Andrieu ◽  
D. Poquillon
Keyword(s):  
Crack Initiation ◽  
Strain Rate ◽  
Nickel Based Superalloy

Very High Cycle Fatigue Behavior and Life Prediction of a Low Strength Weld Metal at Moderate Temperature

2011 ◽  
Author(s):  
Ming-Liang Zhu ◽  
Fu-Zhen Xuan ◽  
Zhengdong Wang
Keyword(s):  
Crack Initiation ◽  
Weld Metal ◽  
Room Temperature ◽  
Fatigue Behavior ◽  
Fatigue Properties ◽  
Dissimilar Welding ◽  
Initiation Mechanism ◽  
Metallic Inclusions ◽  
Low Strength ◽  
Very High

The fatigue properties of a low strength weld metal in a dissimilar welding joint in high cycle and very high cycle regimes were investigated by fully reversed axial tests in air at room temperature and 370°C. A clear duplex S-N curve existed as a result of the transition of fatigue failure mode from surface-induced failure to internal-induced failure at 370°C, while the S-N curve was continuously decreased at room temperature. A new model was successfully proposed to predict fatigue life, and interpret the crack initiation modes transition from surface inclusion to interior inclusion. It was concluded that cracks were initiated by competition among non-metallic inclusions, welding pores and discontinuous microstructures in high cycle regime. While in the very high cycle regime, non-metallic inclusions were the dominant crack initiation mechanism which depended on stress level, inclusion size as well as inclusion depth.

scholarly journals Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy

Materials ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 161 ◽  
Author(s):  
Guoai He ◽  
Liming Tan ◽  
Feng Liu ◽  
Lan Huang ◽  
Zaiwang Huang ◽  
...  
Keyword(s):  
Grain Size ◽  
Hot Compression ◽  
Polycrystalline Nickel ◽  
Nickel Based Superalloy ◽  
Grain Size And Orientation

scholarly journals Creep rupture properties of bare and coated polycrystalline nickel-based superalloy Rene®80

2021 ◽  
pp. 36-36
Author(s):  
M.M. Barjesteh ◽  
S.M. Abbasi ◽  
K.Z. Madar ◽  
K. Shirvani
Keyword(s):  
Elevated Temperatures ◽  
Life Time ◽  
Creep Rupture ◽  
Polycrystalline Nickel ◽  
Creep Life ◽  
Nickel Based Superalloy ◽  
Platinum Aluminide ◽  
Rupture Properties ◽  
Low Activity ◽  
Rupture Behavior

Creep deformation is one of the life time limiting reasons for gas turbine parts that are subjected to stresses at elevated temperatures. In this study, creep rupture behavior of uncoated and platinum-aluminide coated Rene?80 has been determined at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 Mpa in air. For this purpose, an initial layer of platinum with a thickness of 6?m was applied on the creep specimens. Subsequently, the aluminizing were formed in the conventional pack cementation method via the Low Temperature-High Activity (LTHA) and High Temperature-Low Activity (HTLA) processes. Results of creep-rupture tests showed a decrease in resistance to creep rupture of coated specimen, compared to the uncoated ones. The reductions in rupture lives in LTHA and HTLA methods at 760?C/657 MPa, 871?C/343 MPa and 982?C/190 MPa were almost (26% and 41.8%), (27.6% and 38.5%) and (22.4% and 40.3%), respectively as compared to the uncoated ones. However, the HTLA aluminizing method showed an intense reduction in creep life. Results of fractographic studies on coated and uncoated specimens indicated a combination of ductile and brittle failure mechanisms for all samples. Although, the base failure mode in substrate was grain boundary voids, cracks initiated from coating at 760?C/657MPa and 871?C/343. No cracking in the coating was observed at 982?C/190MPa.

Predicting crack initiation site in polycrystalline nickel through surface topography changes

2019 ◽  
Vol 124 ◽  
pp. 70-81 ◽  
Author(s):  
Jalal Fathi Sola ◽  
Randall Kelton ◽  
Efstathios I. Meletis ◽  
Haiying Huang
Keyword(s):  
Crack Initiation ◽  
Surface Topography ◽  
Initiation Site ◽  
Polycrystalline Nickel ◽  
Crack Initiation Site
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