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J.H. Ai, H.Y. Lin, Y.X. Qi
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Stephen D. Antolovich, Ashok Saxena
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Robert L. Amaro, Stephen D. Antolovich, Ashok Saxena
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Morphology of the tip of the crack on the outer surface of the steam chest....
Available to PurchasePublished: 01 December 2019
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Published: 01 December 2019
Book Chapter
Failure Analysis of Power Plant Boiler Material
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001833
EISBN: 978-1-62708-241-9
... indicated that the boiler failure was caused by grain-boundary segregation of phosphorous, tin, and nitrogen and the in-service formation of carbide films and granules on the grain boundaries. steam chest fracture high-temperature oxidation chromium alloy steel grain boundary defects scanning...
Abstract
The failure of a boiler operating at 540 °C and 9.4 MPa was investigated by examining material samples from the near-failure region and by thermodynamic analysis. A scanning Auger microprobe, SEM, and commercial thermodynamic software codes were used in the investigation. Results indicated that the boiler failure was caused by grain-boundary segregation of phosphorous, tin, and nitrogen and the in-service formation of carbide films and granules on the grain boundaries.
Book Chapter
Thermomechanical Fatigue: Mechanisms and Practical Life Analysis
Available to PurchaseSeries: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... of the steam chest and the steam passageways are subjected to high transient thermal stresses during start-up and moderate steady-state mechanical stresses during sustained operation. The metal temperature during steady-state operation is approximately 538 °C (1000 °F), which is in the creep regime; therefore...
Abstract
Thermomechanical fatigue (TMF) refers to the process of fatigue damage under simultaneous changes in temperature and mechanical strain. This article reviews the process of TMF with a practical example of life assessment. It describes TMF damages caused due to two possible types of loading: in-phase and out-of-phase cycling. The article illustrates the ways in which damage can interact at high and low temperatures and the development of microstructurally based models in parametric form. It presents a case study of the prediction of residual life in a turbine casing of a ship through stress analysis and fracture mechanics analyses of the casing.
Book Chapter
Thermomechanical Fatigue—Mechanisms and Practical Life Analysis
Available to PurchaseSeries: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... from 2.25Cr-1Mo steel and are designed to provide service for 30 years. The regions of the casings in the vicinity of the steam chest and the steam passageways are subjected to high transient thermal stresses during startup and to moderate steady-state mechanical stresses during sustained operation...
Abstract
Thermomechanical fatigue (TMF) is the general term given to the material damage accumulation process that occurs with simultaneous changes in temperature and mechanical loading. TMF may couple cyclic inelastic deformation accumulation, temperature-assisted diffusion within the material, temperature-assisted grain-boundary evolution, and temperature-driven surface oxidation, among other things. This article discusses some of the major aspects and challenges of dealing with TMF life prediction. It describes the damage mechanisms of TMF and covers various experimental techniques to promote TMF damage mechanisms and elucidate mechanism coupling interactions. In addition, life modeling in TMF conditions and a practical application of TMF life prediction are presented.
Book
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.9781627083294
EISBN: 978-1-62708-329-4