Assessment of High Temperature Creep Characteristics for P92 Steel Weldment in USC Boiler Header

Abstract The study consisted in assessing the influence of surface and volume modification on the characteristics of high-temperature creep of castings made of waste products of nickel-based superalloys IN 713C and the MAR-247. The results of high-temperature creep tests performed under conditions of two variants of research were analysed. The characteristics of creep according to variant I were obtained on the basis of earlier studies of these alloys with the parameters T=982°C, σ=150MPa [1]. Variant II included carrying out creep tests of alloy IN713C with the parameters T=760°C, σ =400MPa and alloy MAR247 with the parameters: T=982°C, σ=200MPa.Developed creep characteristics were compared with the results of these alloys with the parameters according to variant I of the study. It was observed that the conditions of experiments carried out depending upon the value of the creep test temperature and stress with the creep stability depends on the size of the macrograin (I variant of the studies) or such influence was not observed (II variant of the studies). Stability of samples with coarse structure in variant I of creep tests was significantly higher than the samples with fragmented grain. It was found that the observed stability conditions are dependent on the dominant deformation mechanisms under creep tests carried out - diffusion mechanism in variant I and a dislocation mechanism in variant II of the study. The conditions for the formation and growth of the cracks in the tested materials, including the morphological characteristics of their macro-and microstructure were tested

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Development of Evaluation Technique of High Temperature Creep Characteristics by Small Punch-Creep Test Method (ll) - Boiler Header -

Transactions of the Korean Society of Mechanical Engineers A ◽

10.3795/ksme-a.2002.26.1.055 ◽

2002 ◽

Vol 26 (1) ◽

pp. 55-60

Author(s):

Seung-Se Baek ◽

Dong-Hwan Lee ◽

Jeong-Su Ha ◽

Hyo-Seon Yu

Keyword(s):

High Temperature ◽

Creep Test ◽

Test Method ◽

High Temperature Creep ◽

Evaluation Technique ◽

Small Punch ◽

Temperature Creep ◽

Creep Characteristics ◽

Small Punch Creep Test

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High Temperature Creep Characteristics and Behavior of Fire Resistance Steel(FR355B)

Journal of Korean Society of Steel Construction ◽

10.7781/kjoss.2019.31.3.179 ◽

2019 ◽

Vol 31 (3) ◽

pp. 179-187

Author(s):

Sun Hee Kim ◽

Jae Kwon Ahn ◽

In Hwan Yeo ◽

Sung Mo Choi

Keyword(s):

High Temperature ◽

Fire Resistance ◽

High Temperature Creep ◽

Temperature Creep ◽

Creep Characteristics ◽

And Behavior

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Simulation of crystal plasticity of P92 heat resistant steel considering martensitic lath structure

Journal of Physics Conference Series ◽

10.1088/1742-6596/2079/1/012016 ◽

2021 ◽

Vol 2079 (1) ◽

pp. 012016

Author(s):

Xinyu Wang ◽

Junjie Shen ◽

Xiangru Guo ◽

Jixin Qiao

Keyword(s):

High Temperature ◽

Crystal Plasticity ◽

Element Model ◽

High Temperature Creep ◽

P92 Steel ◽

Temperature Creep ◽

Hardening Models ◽

Average Size ◽

Lath Structure ◽

Martensitic Lath

Abstract Based on the theory of crystal plasticity, coupled with dislocation and lath hardening models, this paper establishes a crystal plasticity finite element model describing the high temperature creep of P92 steel. Open source software was used to generate lath models with an average size of 350nm, 650nm and 950nm to explore the effect of lath coarsening on the high-temperature creep behavior of P92 steel. The results show that the roughening of the slats increases the rate of creep deformation, resulting in a decrease in the service life of the material. Observing the slat model, it can be seen that the roughening of the slats enlarges the numerical gradient of stress and strain, and aggravates the overall plastic strain of the model. The coarsening of the slats accelerates the movement of dislocations, causing the density of movable dislocations to increase, and at the same time the shear strain amplitude of the slip system increases, thereby reducing the hardening behavior of the material.

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