scholarly journals Microstructure evolution and stress rupture properties of K4750 alloys with various B contents during long-term aging

2021 ◽  
Vol 73 ◽  
pp. 108-115
Author(s):  
Xiaoxiao Li ◽  
Meiqiong Ou ◽  
Min Wang ◽  
Xiangdong Zha ◽  
Yingche Ma ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Stress Rupture ◽  
Stress Rupture Properties ◽  
Rupture Properties

Metallurgical Studies on Gas Turbine Blade Materials After a Long Term Service

1969 ◽  
Author(s):  
H. Susukida ◽  
D. Sunamoto ◽  
Y. Sakumoto
Keyword(s):  
Fatigue Strength ◽  
Gas Turbine ◽  
Turbine Blade ◽  
Rupture Strength ◽  
Stress Rupture ◽  
Gas Turbine Blade ◽  
Stress Rupture Properties ◽  
Similar Temperature ◽  
Rupture Properties

This paper deals with the changes of tensile, impact, and stress-rupture properties and microstructure of gas turbine blade materials due to long term heating at the temperature of 650 C (1200 F) to 800 C (1470 F) for up to 10,000 hr or due to the service operation at similar temperature range on several occasions in 34,000 hr. The relation between the above changes of the properties and the thermal fatigue strength, and the stress-rupture strength and the fatigue strength at 700 C (1292 F) and 750 C (1382 F) under corrosive environment containing vanadium and/or sulfur were also investigated. The materials involved are several heat resisting alloys such as Inconel 700, Inconel X, S816. Useful information for selection of gas turbine blade materials was obtained.

Effects of Long-Term Aging Treatment on Stress Rupture Properties of FGH95 Ni-Base Superalloy

2013 ◽  
Vol 747-748 ◽  
pp. 684-689
Author(s):  
Su Gui Tian ◽  
Guang Liang Xie ◽  
Jun Xie ◽  
Xiao Ming Zhou
Keyword(s):  
Stress Rupture ◽  
Aging Treatment ◽  
Stress Rupture Property ◽  
Microstructure Observation ◽  
Partial Dislocations ◽  
Stress Rupture Properties ◽  
The Matrix ◽  
Deformation Features ◽  
Rupture Properties

The effect of long-term aging on stress rupture properties was investigated by means of microstructure observation and properties measurement. The results showed that, after long-term aging for 500 h at 723 K, the coarser particle-like γ phase was precipitated along the grain boundaries of alloy, significant amount of γ particles were regularly distributed within the grain. Moreover, some carbide particles precipitated depressively along the boundaries and within the grain. As the aged time and temperature increased, the size of fine γ particles in the alloy increased slightly, and the stress rupture property of the alloy decreased under the condition of 923K and 1034MPa. The deformation features of the alloy during creep were that the dislocations slip in the matrix or shear into the γ phase, the dislocations shearing into the γ phase may be decomposed to form the configuration of the two partial-dislocations plus stacking fault. As the creep went on, the slipping traces with different orientations appeared in the surface of the specimen, and some slipping steps were formed in the region near the boundaries, which may cause the stress concentration to promote the initiation and propagation of the cracks along the boundaries up to creep fracture.

Effects of Long-Term Aging Treatment on Stress Rupture Properties of FGH95 Ni-Base Superalloy

2013 ◽  
Vol 747-748 ◽  
pp. 678-683
Author(s):  
Su Gui Tian ◽  
Guang Liang Xie ◽  
Jun Xie ◽  
Xiao Ming Zhou
Keyword(s):  
Stress Rupture ◽  
Aging Treatment ◽  
Stress Rupture Property ◽  
Microstructure Observation ◽  
Partial Dislocations ◽  
Stress Rupture Properties ◽  
The Matrix ◽  
Deformation Features ◽  
Rupture Properties

The effect of long-term aging on stress rupture properties was investigated by means of microstructure observation and properties measurement. The results show that, after long-term aging for 500 h at 723 K, the coarser particle-like γ phase is precipitated along the grain boundaries of alloy, significant amount of γ particles are regularly distributed within the grain. Moreover, some carbide particles precipitated depressively along the boundaries and within the grain. As the aged time and temperature increase, the size of fine γ particles in the alloy increases slightly, and the stress rupture property of the alloy decreases under the condition of 923K and 1034MPa. The deformation features of the alloy during creep are that the dislocations slip in the matrix or shear into the γ phase, the dislocations shearing into the γ phase may be decomposed to form the configuration of the two partial-dislocations plus stacking fault. As the creep goes on, the slipping traces with different orientations appear in the surface of the specimen, and some slipping steps are formed in the region near the boundaries, which may cause the stress concentration to promote the initiation and propagation of the cracks along the boundaries up to creep fracture.

Effects of Ruthenium on Microstructure and Stress Rupture Properties of a Nickel-Base Single Crystal Superalloy

2013 ◽  
Vol 747-748 ◽  
pp. 777-782
Author(s):  
Shuai Yang ◽  
Jian Zhang ◽  
Yu Shi Luo ◽  
Yun Song Zhao ◽  
Ding Zhong Tang ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Stress Rupture ◽  
Thermal Exposure ◽  
Microstructural Stability ◽  
Stress Rupture Properties ◽  
Tcp Phases ◽  
Mean Size ◽  
Nickel Base ◽  
Rupture Properties

The effect of Ru addition (0 wt.%, 3 wt.%, 5 wt.%), on γ morphology, elemental segregation, microstructural stability under long-term thermal exposure at 980 and stress rupture properties at 1100°C/130MPa have been studied. The results showed that with the increase of Ru content, the γ/γ eutectic volume fraction and the dendrite arm spacing decreased gradually. The γ' phase mean size in three alloys decreased with the increase of the Ru content. On the other hand, the dendrite segregation of Al, Ta towards interdendrite area and ReW towards dendrite core area was alleviated gradually with the increase of the Ru content. The increase of Ru content from 0 wt.% to 5 wt.% pronouncedly enhanced the stress rupture properties by suppressing the precipitation of TCP phases effectively at high temperature.

Effect of Long-term Thermal Exposure on Microstructure and Stress Rupture Properties of GH3535 Superalloy

2015 ◽  
Vol 31 (3) ◽  
pp. 269-279 ◽  
Author(s):  
T. Liu ◽  
J.S. Dong ◽  
L. Wang ◽  
Z.J. Li ◽  
X.T. Zhou ◽  
...  
Keyword(s):  
Stress Rupture ◽  
Thermal Exposure ◽  
Stress Rupture Properties ◽  
Rupture Properties
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