Creep Properties and Damage Study of Ni-Based Alloy C276 at High Temperature

2011 ◽  
Vol 328-330 ◽  
pp. 1143-1148 ◽  
Author(s):  
Xue Ping Mao ◽  
Qi Guo ◽  
Sheng Yuan Zhang ◽  
Su Yang Hu ◽  
Dao Gang Lu ◽  
...  
Keyword(s):  
High Temperature ◽  
Stress Level ◽  
Creep Damage ◽  
Primary Creep ◽  
Type I ◽  
High Temperature Creep ◽  
Fuel Cladding ◽  
Creep Tests ◽  
Temperature Creep ◽  
Creep Characteristic

One of the two challenges about Supercritical Water-Cooled Reactor is material, especially for the fuel cladding. High temperature creep tests of Ni-based alloy C276, one of the candidate materials for the fuel cladding, were carried out at 650°C~750°C, with stress 130MPa~430MPa. The effects of temperature and stress on creep were investigated, the change laws of steady state creep rate with stress and time to rupture were analysed, and creep damage factors were separately calculated based on Kachanov’s formula and Norton’s formula. The results indicate that there exist two types of primary creep characteristics in C276: Type I creep characteristic at lower stress level and Type II at higher stress level respectively. C276 shows excellent high temperature creep resistance, and Kachanov’s damage factors D vs normalized time are basically coincident at 650°C, 700°C and 750°C. The damage obtained by Norton’s formula starts at about 40% of lifetime, and the damage factors calculated by Kachanov’s formula are relatively conservative.

Cantilever creep method for testing ceramic composites and a case study for chemically bonded phosphate ceramic composites reinforced with glass, carbon and basalt fibers, including both experiments and simulations

2020 ◽  
Vol 54 (20) ◽  
pp. 2663-2676
Author(s):  
Henry A Colorado ◽  
Elkin I Gutiérrez-Velásquez ◽  
Clem Hiel
Keyword(s):  
High Temperature ◽  
Large Scale ◽  
Extreme Environments ◽  
Ceramic Composites ◽  
High Temperature Creep ◽  
Creep Tests ◽  
Element Analysis ◽  
Temperature Creep ◽  
Glass Carbon ◽  
Electron Microscopy Analysis

This paper presented the cantilever beam experiments and the method for creep in chemically bonded ceramics reinforced with glass, carbon, and basalt unidirectional fibers. The ceramic composite samples were fabricated by mixing wollastonite powder and phosphoric acid, through the resonant acoustic mixing technique. The reinforced fibers were added via pultrusion process. The manufactured materials were exposed to high temperature creep tests at 600, 800 and 1000℃, with an annealing time of 1 h, all in air environment. Some examples of real large-scale structures made manually by a company were also included. In order to understand the microstructure, X-ray diffraction and scanning electron microscopy analysis were included. The presented method is simple and can be used in any inorganic ceramic slurry types, such as geopolymers, phosphate cements, clay-based materials, or Portland cement composites. The sample response in high temperature creep experiments was analyzed with a new but very simple technique, and modeled using finite element analysis over all compositions. Results revealed that fibers have a significant effect on the composite creep when compared to the ceramic without reinforcement, and particularly carbon fibers showed a quite interested effect in reducing the creep effects. Results show the limit of the materials under conditions typically found in fires and other extreme environments.

Study on High-Temperature Creep Behavior of T23 and T24 Steels

2018 ◽  
Vol 789 ◽  
pp. 182-186
Author(s):  
Jin Ping Pan ◽  
Shu Heng Tu ◽  
Ding Jun Chu ◽  
Xin Wei Zhu ◽  
Bin Hu ◽  
...  
Keyword(s):  
High Temperature ◽  
Creep Behavior ◽  
Rupture Strength ◽  
Progressive Increase ◽  
High Temperature Creep ◽  
Creep Tests ◽  
Theoretical Simulation ◽  
Temperature Creep ◽  
Piping Systems ◽  
Different Temperatures

A progressive increase of plant efficiency calls for new requirements of heat-resistantsteels used in the boiler and piping systems. In this paper, high-temperature creep behavior of T23and T24 steels were studied. Creep tests over a long period of time have been conducted for bothsteels at different temperatures. The creep mechanisms of the two steels have been clarified byanalyzing the minimum creep rate versus stress data. Besides, the creep rupture data from the creeptests were in good accordance with theoretical simulation on the basis of the CDM model over a longtime. Creep temperature has great effects on the rupture strength of the two steels. By creep ruptureexperiments and appropriate modelling, the high-temperature creep behavior can be well described.

High Temperature Creep Damage Under Biaxial Loading—Part II: Model and Simulations

1990 ◽  
Vol 112 (4) ◽  
pp. 450-455 ◽  
Author(s):  
F. Trivaudey ◽  
P. Delobelle
Keyword(s):  
High Temperature ◽  
Biaxial Loading ◽  
Creep Damage ◽  
Internal Variables ◽  
Anisotropic Damage ◽  
High Temperature Creep ◽  
Viscoplastic Model ◽  
Temperature Creep ◽  
Complete Formulation ◽  
Damage Law

The inadequacies, in describing the high temperature creep damage of two industrial alloys (Part I) with a model where the anisotropic damage variable D depends only on time have been pointed out. It is therefore proposed to introduce directly strain rate in the damage law. This rule is then integrated into a unified viscoplastic model, with internal variables, that has been developed elsewhere. Some numerical simulations obtained with the complete formulation are reported and, in general, yield acceptable results.

Effect of Variation in Grain Size on High Temperature Creep Test of Fe-Ni-Cr Alloy

2013 ◽  
Vol 845 ◽  
pp. 51-55
Author(s):  
Esah Hamzah ◽  
Maureen Mudang ◽  
Muhammad Adil Khattak
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Creep Rate ◽  
Creep Damage ◽  
Grain Boundary Sliding ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Nickel Based Superalloy ◽  
Solution Treated ◽  
Incoloy 800H

Fe-Ni-Cr or known as Incoloy 800H and Haynes HR120 is a solid solution strengthened iron-nickel based superalloy which is extensively used in high temperature and corrosive environment. The effect of grain size in creep strength and creep rate comes through the grain boundary sliding and grain boundaries as barrier mechanism. This paper describes the effect of microstructural variation of Fe-Ni-Cr on the high temperature creep properties. The materials were heat treated at temperature 1050°C and 1200°C followed by water quenching process. The grain size of the samples of Incoloy 800H is 95.47μm for as-received, 122.81μm for solution treated at 1050°C and 380.95μm for solution treated at 1200°C. And the grain size of the samples of Haynes HR120 is 53.45μm for as-received, 61.50μm for solution treated at 1050°C and 158.27μm for solution treated at 1200°C. The creep damage investigation was carried out in the three different grain sizes of Fe-Ni-Cr superalloy at 900°C with stress at 100MPa. Rectangular section forms of specimens are used in the research. In all the tests conducted, the creep curves show primary, secondary and tertiary stages. The creep fracture surface were characterised by using scanning electron microscope. It was found that larger grain size results in lower creep rate for alloy Haynes HR120 but inverse result showed on alloy Incoloy 800H.

High Temperature Creep Damage Mechanisms in a Directionally Solidified Alloy: Impact of Crystallography and Environment

2016 ◽  
pp. 745-756 ◽  
Author(s):  
L. Mataveli Suave ◽  
L. Mataveli Suave ◽  
J. Cormier ◽  
P. Villechaise ◽  
D. Bertheau ◽  
...  
Keyword(s):  
High Temperature ◽  
Creep Damage ◽  
High Temperature Creep ◽  
Directionally Solidified ◽  
Damage Mechanisms ◽  
Temperature Creep
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