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Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel. / Chia Yuin Wong

Swansea University Author: Chia Yuin Wong

Abstract

The microstructure evolution of a commercial grade creep-resistant austenitic steel, namely Esshete 1250, was investigated under different creep temperature and stress conditions, with an overall aim of exploring the micorstructural relationship to creep rupture during high temperature application....

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Published: 2008
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42426
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spelling 2018-08-02T16:24:29.2130002 v2 42426 2018-08-02 Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel. 2fabf4277e942572dc6d2db0704d2068 NULL Chia Yuin Wong Chia Yuin Wong true true 2018-08-02 The microstructure evolution of a commercial grade creep-resistant austenitic steel, namely Esshete 1250, was investigated under different creep temperature and stress conditions, with an overall aim of exploring the micorstructural relationship to creep rupture during high temperature application. Creep tests data was supplied by British Energy on temperatures varied from 550&deg;C to 700&deg;C for periods of up to 17 years. The literature review includes the study of various creep resistant alloys and a detailed investigation on the precipitation reactions that take place in creep resistant steels. Moreover, the strengthening mechanisms in order to obtain suitable creep resistance properties for engineering materials for high temperature applications is also reviewed. Long term creep deformation for Esshete 1250 creep resistant steel is reviewed in Chapter 2. The tensile properties of Esshete 1250 parent material and weld material are included in this Chapter as well. Qualitative and quantitative metallography techniques are reviewed in order to provide the required background information for the interpretation of obtained microstructure. The experimental study involved hardness testing and scanning electron microscopy examination. The size, distribution of MX precipitates was analysed with electron microscopy techniques together with Optilab analysis, while metallographic grain evolution measurements in creep exposed samples was also carried out. As part of this study, the grain size evolution and precipitate size evolution of Esshete 1250 creep resistant steel are obtained. Attention then is given to the volume fraction, size and distribution of MX (Nb-rich) particles. It is concluded that MX precipitation is the key factor that influences the creep resistance of Esshete 1250 under service conditions, while grain size is additional to the effect of MX precipitation in solution and is of secondary importance. The obtained results can be implemented into other creep alloy design, helping to meet the challenge of developing high temperature alloy systems for greater sustainability. E-Thesis Materials science. 31 12 2008 2008-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.2130002 2018-08-02T16:24:29.2130002 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Chia Yuin Wong NULL 1 0042426-02082018162453.pdf 10798134.pdf 2018-08-02T16:24:53.4700000 Output 25595810 application/pdf E-Thesis true 2018-08-02T16:24:53.4700000 false
title Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel.
spellingShingle Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel.
Chia Yuin Wong
title_short Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel.
title_full Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel.
title_fullStr Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel.
title_full_unstemmed Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel.
title_sort Microstructure evolution in Nb alloyed Esshete 1250 creep resistant austenitic stainless steel.
author_id_str_mv 2fabf4277e942572dc6d2db0704d2068
author_id_fullname_str_mv 2fabf4277e942572dc6d2db0704d2068_***_Chia Yuin Wong
author Chia Yuin Wong
author2 Chia Yuin Wong
format E-Thesis
publishDate 2008
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The microstructure evolution of a commercial grade creep-resistant austenitic steel, namely Esshete 1250, was investigated under different creep temperature and stress conditions, with an overall aim of exploring the micorstructural relationship to creep rupture during high temperature application. Creep tests data was supplied by British Energy on temperatures varied from 550&deg;C to 700&deg;C for periods of up to 17 years. The literature review includes the study of various creep resistant alloys and a detailed investigation on the precipitation reactions that take place in creep resistant steels. Moreover, the strengthening mechanisms in order to obtain suitable creep resistance properties for engineering materials for high temperature applications is also reviewed. Long term creep deformation for Esshete 1250 creep resistant steel is reviewed in Chapter 2. The tensile properties of Esshete 1250 parent material and weld material are included in this Chapter as well. Qualitative and quantitative metallography techniques are reviewed in order to provide the required background information for the interpretation of obtained microstructure. The experimental study involved hardness testing and scanning electron microscopy examination. The size, distribution of MX precipitates was analysed with electron microscopy techniques together with Optilab analysis, while metallographic grain evolution measurements in creep exposed samples was also carried out. As part of this study, the grain size evolution and precipitate size evolution of Esshete 1250 creep resistant steel are obtained. Attention then is given to the volume fraction, size and distribution of MX (Nb-rich) particles. It is concluded that MX precipitation is the key factor that influences the creep resistance of Esshete 1250 under service conditions, while grain size is additional to the effect of MX precipitation in solution and is of secondary importance. The obtained results can be implemented into other creep alloy design, helping to meet the challenge of developing high temperature alloy systems for greater sustainability.
published_date 2008-12-31T03:52:56Z
_version_ 1763752622813085696
score 11.012678

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