The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube

Most of superheated tubes of power plants using oil as fuel have premature failures usually caused by mechanical and corrosion failure. The application of superheated boiler tube includes a sequence of events such as fluctuating stress levels at constant temperature, fluctuating temperature levels a...

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Main Author:	Suprapto, Agus
Format:	Thesis
Published:	2000
Subjects:	TJ Mechanical engineering and machinery
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spelling	my-utm-ep.68652011-01-23T12:17:06Z The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube 2000 Suprapto, Agus TJ Mechanical engineering and machinery Most of superheated tubes of power plants using oil as fuel have premature failures usually caused by mechanical and corrosion failure. The application of superheated boiler tube includes a sequence of events such as fluctuating stress levels at constant temperature, fluctuating temperature levels at constant stress, and periods during which both stress and temperature are simultaneously fluctuating. This is supported by evidence indicating that the thermal cycling and creep processes interact to produce a synergistic response. In this study creep test was carried out at temperature 5500C with constant stress 333.3 MPa, and creep-thermal cycling test was generated by constant stress during hold periods at maximum temperature 5500C and at minimum temperature 4200C on low alloy steel with Grade 360 BS3059. The samples were held at minimum temperature in two different media; in a furnace and in air respectively. Fractographic studies of fracture surface features, metallographic studies of microstructure, and studies of chemical composition are presented in the failure analysis as an aid in determining the failure mode of superheater tube. In the case study of mechanical properties and metallographic examination using optical microscope as well as SEM and EDX showed that a failure of superheater boiler tube, involved a combination of creep, thermal fatigue, stress corrosion cracking and local overheating of material with code SA213. Under conditions of experimental simulation, the fracture surface in which the crack morphologies were wedge and cavity intergranular crack type can be classified as ductile fracture. Time to rupture for the creep-thermal cycling tests was longer than that for the static creep tests on low alloy steel superheater tube, which is strongly affected by holding periods, number of cycles and environment. The texture of superheater tube component that have failed during service (case study), which showed creep and creep-thermal fatigue specimen tested was similar to major texture {110} and minor texture {200} and{211}. 2000 Thesis http://eprints.utm.my/id/eprint/6865/ http://sps.utm.my phd doctoral Universiti Teknologi Malaysia, Mechanical Engineering Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Suprapto, Agus The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube
description	Most of superheated tubes of power plants using oil as fuel have premature failures usually caused by mechanical and corrosion failure. The application of superheated boiler tube includes a sequence of events such as fluctuating stress levels at constant temperature, fluctuating temperature levels at constant stress, and periods during which both stress and temperature are simultaneously fluctuating. This is supported by evidence indicating that the thermal cycling and creep processes interact to produce a synergistic response. In this study creep test was carried out at temperature 5500C with constant stress 333.3 MPa, and creep-thermal cycling test was generated by constant stress during hold periods at maximum temperature 5500C and at minimum temperature 4200C on low alloy steel with Grade 360 BS3059. The samples were held at minimum temperature in two different media; in a furnace and in air respectively. Fractographic studies of fracture surface features, metallographic studies of microstructure, and studies of chemical composition are presented in the failure analysis as an aid in determining the failure mode of superheater tube. In the case study of mechanical properties and metallographic examination using optical microscope as well as SEM and EDX showed that a failure of superheater boiler tube, involved a combination of creep, thermal fatigue, stress corrosion cracking and local overheating of material with code SA213. Under conditions of experimental simulation, the fracture surface in which the crack morphologies were wedge and cavity intergranular crack type can be classified as ductile fracture. Time to rupture for the creep-thermal cycling tests was longer than that for the static creep tests on low alloy steel superheater tube, which is strongly affected by holding periods, number of cycles and environment. The texture of superheater tube component that have failed during service (case study), which showed creep and creep-thermal fatigue specimen tested was similar to major texture {110} and minor texture {200} and{211}.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Suprapto, Agus
author_facet	Suprapto, Agus
author_sort	Suprapto, Agus
title	The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube
title_short	The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube
title_full	The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube
title_fullStr	The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube
title_full_unstemmed	The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube
title_sort	characterisrics and failure mechanisms of creep and creep-thermal cycling of superheater tube
granting_institution	Universiti Teknologi Malaysia, Mechanical Engineering
granting_department	Mechanical Engineering
publishDate	2000
_version_	1747814696947286016

The Characterisrics And Failure Mechanisms Of Creep And Creep-Thermal Cycling Of Superheater Tube

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