Detail publikace
In Situ analýza vlastností šíření únavové trhliny s použitím SEM/EBSD v superduplexní nerezové oceli
CHAI, G. PENG, R. L SLÁMEČKA, K. JOHANSSON S.
Český název
In Situ analýza vlastností šíření únavové trhliny s použitím SEM/EBSD v superduplexní nerezové oceli
Anglický název
In Situ SEM/EBSD analysis of fatigue crack propagation behavior of a super duplex stainless steel
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
en
Originální abstrakt
Fatigue crack branching and deflection behaviour in an UNS S32750 (SAF 2507) duplex stainless steel has been investigated using an In-situ SEM/EBSD fatigue test and a conventional da/dN methodology. Occurrence of crack branching results mainly from the extrusions and intrusions of slip bands developed in the grains. The number of crack branches formed depends strongly on the loading condition and the microstructure of the material. The in-situ observation confirms that the formation of crack branches can significantly reduce the crack propagation rate that leads to crack growth retardation in the main mode I crack path. The crack branches formed are usually not ideal. They can propagate almost transversely to the main crack direction with a mode II stress intensity factor, SIF, and a rate that is much higher than that of the main crack. Crack deflection occurs mainly at the phase boundaries. A high crack deflection can also lead to a crack growth retardation. The high crack deflection and branching behaviour leads to a high fatigue threshold value of the material investigated since they have caused high crack growth retardation and high crack closure.
Český abstrakt
Fatigue crack branching and deflection behaviour in an UNS S32750 (SAF 2507) duplex stainless steel has been investigated using an In-situ SEM/EBSD fatigue test and a conventional da/dN methodology. Occurrence of crack branching results mainly from the extrusions and intrusions of slip bands developed in the grains. The number of crack branches formed depends strongly on the loading condition and the microstructure of the material. The in-situ observation confirms that the formation of crack branches can significantly reduce the crack propagation rate that leads to crack growth retardation in the main mode I crack path. The crack branches formed are usually not ideal. They can propagate almost transversely to the main crack direction with a mode II stress intensity factor, SIF, and a rate that is much higher than that of the main crack. Crack deflection occurs mainly at the phase boundaries. A high crack deflection can also lead to a crack growth retardation. The high crack deflection and branching behaviour leads to a high fatigue threshold value of the material investigated since they have caused high crack growth retardation and high crack closure.
Anglický abstrakt
Fatigue crack branching and deflection behaviour in an UNS S32750 (SAF 2507) duplex stainless steel has been investigated using an In-situ SEM/EBSD fatigue test and a conventional da/dN methodology. Occurrence of crack branching results mainly from the extrusions and intrusions of slip bands developed in the grains. The number of crack branches formed depends strongly on the loading condition and the microstructure of the material. The in-situ observation confirms that the formation of crack branches can significantly reduce the crack propagation rate that leads to crack growth retardation in the main mode I crack path. The crack branches formed are usually not ideal. They can propagate almost transversely to the main crack direction with a mode II stress intensity factor, SIF, and a rate that is much higher than that of the main crack. Crack deflection occurs mainly at the phase boundaries. A high crack deflection can also lead to a crack growth retardation. The high crack deflection and branching behaviour leads to a high fatigue threshold value of the material investigated since they have caused high crack growth retardation and high crack closure.
Klíčová slova česky
Duplexní nerezovéess oceli; EBSD analýza; zavírání únavové trhliny; větvení únavové trhliny; ohýbání únavové trhliny; šíření únavové trhliny
Klíčová slova anglicky
Duplex stainless steels; EBSD analysis; Fatigue closure; Fatigue crack branching; Fatigue crack deflection; Fatigue crack propagation
Rok RIV
2008
Vydáno
02.09.2008
Nakladatel
Vutium
Místo
Brno
ISBN
9781617823190
Kniha
Multilevel Approach to Fracture of Materials, Components and Structures (ECF17)
Číslo edice
1
Strany od–do
1350–1357
Počet stran
8
BIBTEX
@inproceedings{BUT98947,
author="Guocai {Chai} and Karel {Slámečka},
title="In Situ SEM/EBSD analysis of fatigue crack propagation behavior of a super duplex stainless steel",
booktitle="Multilevel Approach to Fracture of Materials, Components and Structures (ECF17)",
year="2008",
month="September",
pages="1350--1357",
publisher="Vutium",
address="Brno",
isbn="9781617823190"
}