High-Temperature Stress Relaxation Cracking and Stress Rupture Observed in a Coke Gasifier Failure

2019 ◽  
pp. 426-438
Keyword(s):  
High Temperature ◽  
Stress Relaxation ◽  
Temperature Stress ◽  
Stress Rupture ◽  
High Temperature Stress

High Temperature Rupture Life of Nickel-Based Superalloy under Directional Solidification with High Temperature Gradient

2017 ◽  
Vol 898 ◽  
pp. 422-429 ◽  
Author(s):  
Wei Guo Zhang ◽  
Zhi Jie Liu ◽  
Song Ke Feng ◽  
Fu Zeng Yang ◽  
Lin Liu
Keyword(s):  
High Temperature ◽  
Temperature Gradient ◽  
Directional Solidification ◽  
Temperature Stress ◽  
Solidification Rate ◽  
Rupture Life ◽  
Stress Rupture ◽  
High Temperature Stress ◽  
Stress Rupture Life ◽  
Nickel Based Superalloy

The stress rupture life of DZ125 nickel-based superalloy that was prepared by directional solidification process under the temperature gradient of 500 K/cm has been studied at 900°C and 235MPa. The results showed that with the increase of directional solidification rate from 50 μm/s to 800 μm/s, the primary dendrite arm spacing reduced from 94 μm to 35.8 μm and γ' precipitates reduced and more uniformed in size. The high temperature stress rupture life of as-cast sample increased firstly and then decreased and reached its maximum at the solidification rate of 500 μm/s. The dislocation configuration of sample with refine dendritic structure after stress rupture was investigated and discovered that the dislocations in different parts of sample had different morphology and density, which indicated that the deformation of as-cast samples were uneven during high temperature stress rupture. A lot of dislocations intertwined around carbides and at the interface of γ/γ', and the dislocation networks were destroyed and the dislocations entered γ' precipitate by the way of cutting.

High temperature stress relaxation in Ti- and Cu-doped reaction bonded Al2O3

2002 ◽  
Vol 22 (14-15) ◽  
pp. 2641-2645 ◽  
Author(s):  
A. Morales-Rodrı́guez ◽  
A. Bravo-León ◽  
M. Jiménez-Melendo ◽  
A. Domı́nguez-Rodrı́guez
Keyword(s):  
High Temperature ◽  
Stress Relaxation ◽  
Temperature Stress ◽  
High Temperature Stress

CENTRALLOY 4852 (HP+Nb)

Alloy Digest ◽  
1995 ◽  
Vol 44 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Structural Stability ◽  
Temperature Stress ◽  
Rupture Strength ◽  
Stress Rupture ◽  
High Temperature Stress ◽  
Chromium Alloy

Abstract CENTRALLOY 4852 (HP + Nb) is a cast austenitic 35% nickel-25% chromium alloy plus niobium (columbium). The alloy possesses excellent structural stability, high temperature stress rupture strength, oxidation and carburization resistance. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on corrosion resistance as well as casting and joining. Filing Code: SS-609. Producer or source: Centracero S.A.

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