scholarly journals Unexpected Precipitation of a Re-Rich Phase in Single Crystal Superalloy CMSX-4 during Thermal Exposure

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Kuiyu Cheng ◽  
ChangYong Jo ◽  
DooHyun Kim ◽  
Tao Jin ◽  
Zhuangqi Hu
Keyword(s):  
Diffusion Process ◽  
Single Crystal ◽  
Interdendritic Region ◽  
Thermal Exposure ◽  
Dendrite Core ◽  
Single Crystal Superalloy ◽  
Core Formation ◽  
Rich Phase

A Re-rich phase (up to 85.40% wt.Re) was occasionally found in a single crystal superalloy during thermal exposure. Interestingly, this phase is located in front of the dendrite periphery in the interdendritic region, while the Re is segregated in the dendrite core. Formation of this phase was suggested to relate to the unusual accumulation of the Re resulting from the uneven diffusion process of Re. Appearance of this phase may imply the preference of forming Re-Re atomic bond in the superalloys.

New Phases in a Multicomponent High Ruthenium Single Crystal Superalloy

2005 ◽  
Vol 475-479 ◽  
pp. 655-660 ◽  
Author(s):  
Q. Feng ◽  
L.J. Rowland ◽  
T.M. Pollock
Keyword(s):  
Single Crystal ◽  
Dendritic Structure ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Heusler Phase ◽  
Topologically Close Packed ◽  
Tcp Phases ◽  
Δ Phase

Three unusual Ru-rich phases have been identified in a multicomponent Ni-base single crystal superalloy, including a L21 Ru2AlTa Heusler phase, a B2 RuAl phase and a hcp Re(Ru)-rich δ phase. These phases have their own preferential precipitation location within the dendritic structure. No conventional topologically-close-packed (TCP) phases have been observed with thermal exposure at 950oC for 1500 hours.

scholarly journals Effect of long-term thermal exposure on microstructure and creep properties of DD5 single crystal superalloy

China Foundry ◽  
2021 ◽  
Vol 18 (3) ◽  
pp. 185-191
Author(s):  
Xu-dong Wang ◽  
Zhong Yang ◽  
Qiang Gao ◽  
Li-rong Liu
Keyword(s):  
Single Crystal ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Creep Properties

The Microstructure Evolution of a Nickel-Base Single Crystal Superalloy after Long-Term Aging

2015 ◽  
Vol 1088 ◽  
pp. 217-220 ◽  
Author(s):  
Yu Xian Jia
Keyword(s):  
Single Crystal ◽  
Exposure Time ◽  
Microstructure Evolution ◽  
Ageing Time ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Phase Precipitation ◽  
Tcp Phase ◽  
Nickel Base

Microstructure evolution of a nickel-base single crystal superalloy during thermal exposure at 982°C was investigated. The SEM studies revealed that the size of γ' phase increased and some of which linked together with the elongation of the exposure time. There is acicular phase precipitation after the long-term ageing treatment. The TCP phase is not increased by the increment of ageing time after reaching a certain amount. There are skeleton shape carbides precipitate after 100h and 300h. The amount of precipitated carbides decreases by the elongation of ageing time.

Effect of Hot Isostatic Pressing on the Microstructure of Single Crystal Ni-Based Superalloy DD10

2013 ◽  
Vol 747-748 ◽  
pp. 772-776
Author(s):  
Li Jun Liu ◽  
Ming Xue ◽  
Jing Yang Chen ◽  
La Mei Cao
Keyword(s):  
Electron Microscope ◽  
Single Crystal ◽  
Interdendritic Region ◽  
Hot Isostatic Pressing ◽  
Optical Microscope ◽  
Dendrite Core ◽  
Dendritic Segregation ◽  
Third Generation ◽  
Isostatic Pressing ◽  
Scanning Electron

The effects of hot isostatic pressing on the microstructures of a third generation single crystal Ni-based superalloy DD10 were investigated by using optical microscope (OM), scanning electron microscope (SEM), electron microprobe analyzer (EPMA). The results showed that the micropores in the interdendritic region were eliminated completely after hot isostatic pressing at 1320 and 150MPa. Meanwhile, the morphology of γ precipitates changed to be more cuboidal and the distribution of γ precipitates in both dendrite core and interdendritic region became more uniform after hot isostatic pressing. Hot isostatic pressing also promoted the homogenization of the composition between dendrite core and interdendritic region and the dendritic segregation of Re, W, Al and Ta was decreased.

Microsegregation Behavior of Single Crystal Superalloy

2014 ◽  
Vol 983 ◽  
pp. 121-126
Author(s):  
Zhu Huan Yu ◽  
Jun Feng Qiang
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dendrite Core ◽  
Single Crystal Superalloy ◽  
Carbon Addition ◽  
Segregation Behavior ◽  
Carbon Additions

The major advancements in some mechanical properties of single crystal superalloys can be attributed to the carbon addition. The present study investigated the effect of carbon addition levels on the microsegregation behavior of single crystal superalloys. Quantitatative partitioning results indicated that typical single crystal superalloy segregation behavior for some elements such as W, Ni, Co, are all towards the dendrite core regions, while for elements of Al, Mo, Ta, Ti, Cr, partition towards the interdendrite regions. For all the alloys studied, the baseline alloy showed the most severe segregation degree, while the no carbon alloy the slightest. Furthermore, the segregation behavior of Ti and Ta were affected by the carbon additions, and that of W was greatly affected by the carbon levels.

Influence of thermal exposure on microstructure and stress rupture property of a Re-containing Ni-based single crystal superalloy

2021 ◽  
Vol 136 ◽  
pp. 107237
Author(s):  
Xinxin Liu ◽  
Taiwen Huang ◽  
Jiachen Zhang ◽  
Dong Wang ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Stress Rupture ◽  
Thermal Exposure ◽  
Single Crystal Superalloy ◽  
Stress Rupture Property

scholarly journals Effect of Interactions Among Elements on Diffusion Process Associated with γ′ Coarsening in a Ni-Based Single-Crystal Superalloy

2020 ◽  
Vol 33 (7) ◽  
pp. 1013-1020
Author(s):  
Guang-Lei Wang ◽  
Dong-Qing Qi ◽  
Ji-De Liu ◽  
Jin-Lai Liu ◽  
Yi-Zhou Zhou ◽  
...  
Keyword(s):  
Diffusion Process ◽  
Single Crystal ◽  
Single Crystal Superalloy
Sign in / Sign up

Export Citation Format

Share Document