Assessment and Quantification of Damage in the Grade 91 Steel PTZ_Final Submitted_.pdf (1.14 MB)
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Assessment and quantification of damage in the grade 91 steel partially transformed zone

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conference contribution
posted on 08.06.2020, 14:08 by John Siefert, Jonathan Parker, Ryan MaclachlanRyan Maclachlan, xin xie yang, Rachel ThomsonRachel Thomson
Damage in the grade 91 steel partially transformed zone has historically been associated with many different types of features in the microstructure. Susceptible features responsible for the nucleation of damage are frequently cited to include particles such as laves phase, coarse M23C6, inclusions, nitrides, or interactions between creep strong and creep week grains, grain boundaries and potentially other sources. Few studies have attempted to link these observations on a statistically relevant basis using 2D or 3D microscopy techniques. In this study, 2D assessment using scanning electron microscopy (SEM) and quantification techniques such as energy dispersive x-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD) are utilized in combination with 3D serial sectioning of large volumes using plasma focused ion beam milling (P-FIB) and simultaneous EDS to evaluate an interrupted cross-weld creep test. The cross-weld creep test was performed using a feature-type geometry, in parent material susceptible to the evolution of creep damage and interrupted at an estimated life fraction of 70%. The findings from these evaluations provide perspective on the features in the microstructure responsible for the nucleation and subsequent growth of the observed damage.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials (2019)

Pages

22 - 34 (13)

Source

Joint EPRI-123HiMAT International Conference on Advances in High Temperature Materials

Publisher

ASM International

Version

AM (Accepted Manuscript)

Publisher statement

This paper is made available as an electronic reprint with the permission of ASM International for the Loughborough Institutional Repository. Reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.

Acceptance date

16/07/2019

Publication date

2019-10-01

ISBN

9781627082716

Language

en

Editor(s)

John Shingledecker; Takuyama Masao

Location

Nagasaki, Japan

Event dates

21st October 2019 - 25th October 2019

Depositor

Prof Rachel Thomson. Deposit date: 7 June 2020

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