Microstructure and dislocation arrangements in Sanicro 25 steel fatigued at ambient and elevated temperatures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00480482" target="_blank" >RIV/68081723:_____/17:00480482 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26210/17:PU121337

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.msea.2016.10.076" target="_blank" >http://dx.doi.org/10.1016/j.msea.2016.10.076</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2016.10.076" target="_blank" >10.1016/j.msea.2016.10.076</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure and dislocation arrangements in Sanicro 25 steel fatigued at ambient and elevated temperatures

Popis výsledku v původním jazyce

Microstructure and dislocation structures in high alloyed heat resistant Sanicro 25 austenitic steel cyclically strained in a wide interval of constant strain amplitudes both at room temperature and at temperature of 700 degrees C were studied by means of transmission electron.microscopy (TEM). The spatial arrangement of dislocations was determined using the technique of oriented foils. The character and the Burgers vectors of dislocations were determined. It was found that at room temperature strong planarity of dislocation slip prevails. Cyclic plastic deformation is localized into thin bands of high dislocation density which have different structure than ladder like arrangement. No distinctive wall and channel dislocation configurations were observed but bands have character of alternating dislocation rich and dislocation poor areas. Pronounced plastic strain localization leads to cyclic softening. In high temperature cyclic straining enhanced cross-slip leads to substantial increase of dislocation density. Objects of nanometer size coherent with the matrix were found simultaneously with the evidence indicating pinning of dislocations. The high dislocation density, its homogeneous distribution and interaction of nanoclusters and gliding dislocations are the cause of exceptional cyclic hardening of this material at high temperatures. Due to this hardening, the saturated cyclic stress at 700 degrees C is remarkably high.

Název v anglickém jazyce

Microstructure and dislocation arrangements in Sanicro 25 steel fatigued at ambient and elevated temperatures

Popis výsledku anglicky

Microstructure and dislocation structures in high alloyed heat resistant Sanicro 25 austenitic steel cyclically strained in a wide interval of constant strain amplitudes both at room temperature and at temperature of 700 degrees C were studied by means of transmission electron.microscopy (TEM). The spatial arrangement of dislocations was determined using the technique of oriented foils. The character and the Burgers vectors of dislocations were determined. It was found that at room temperature strong planarity of dislocation slip prevails. Cyclic plastic deformation is localized into thin bands of high dislocation density which have different structure than ladder like arrangement. No distinctive wall and channel dislocation configurations were observed but bands have character of alternating dislocation rich and dislocation poor areas. Pronounced plastic strain localization leads to cyclic softening. In high temperature cyclic straining enhanced cross-slip leads to substantial increase of dislocation density. Objects of nanometer size coherent with the matrix were found simultaneously with the evidence indicating pinning of dislocations. The high dislocation density, its homogeneous distribution and interaction of nanoclusters and gliding dislocations are the cause of exceptional cyclic hardening of this material at high temperatures. Due to this hardening, the saturated cyclic stress at 700 degrees C is remarkably high.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20306 - Audio engineering, reliability analysis

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Science and Engineering A-Structural materials

ISSN

0921-5093

e-ISSN

—

Svazek periodika

680

Číslo periodika v rámci svazku

JAN

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

168-181

Kód UT WoS článku

000390495600020

EID výsledku v databázi Scopus

2-s2.0-84999008968