Effect of solution annealing on low cycle fatigue of 304L stainless steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F21%3A00545917" target="_blank" >RIV/68081723:_____/21:00545917 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S092150932101073X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S092150932101073X?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2021.141807" target="_blank" >10.1016/j.msea.2021.141807</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of solution annealing on low cycle fatigue of 304L stainless steel

Popis výsledku v původním jazyce

The present study investigates low cycle fatigue behaviour of the metastable austenitic 304L steel in two variants: i) as-received and ii) after additional solution annealing at 1050 ◦C/30 min. The applied heat treatment resulted in a decrease of δ-ferrite volume fraction and slight grain coarsening. After the solution annealing, significantly prolonged fatigue life within the whole range of studied total strain amplitudes was observed. Such improvement is attributed to the larger grain size possessing better ductility and enhanced formation of deformation-induced martensite. The phase transformation led to a significant secondary cyclic hardening stage at high strain amplitude loading. The low cycle fatigue behaviour and principal fatigue life stages were characterized by the analysis of cyclic response. A vital supplementary data were obtained by the analysis of hysteresis loop shape carried out, for the first time on a phase-transforming material, by the generalized statistical theory. The analysis was able to follow the evolution of cyclic stress sources during the fatigue life, especially the increasing contribution of deformation-induced martensite. The identified features of cyclic plasticity were supported by electron channeling contrast imaging observations. Furthermore, electron backscatter diffraction revealed a distinct preferential localization of α’-martensite into macrobands parallel to rolling direction. Energy dispersive spectroscopy mapping identified pronounced chemical segregation of Cr and Ni which correlated well with the observed macrobands. These compositional fluctuations led to local austenite metastability which is enhanced further by the applied solution annealing.

Název v anglickém jazyce

Effect of solution annealing on low cycle fatigue of 304L stainless steel

Popis výsledku anglicky

The present study investigates low cycle fatigue behaviour of the metastable austenitic 304L steel in two variants: i) as-received and ii) after additional solution annealing at 1050 ◦C/30 min. The applied heat treatment resulted in a decrease of δ-ferrite volume fraction and slight grain coarsening. After the solution annealing, significantly prolonged fatigue life within the whole range of studied total strain amplitudes was observed. Such improvement is attributed to the larger grain size possessing better ductility and enhanced formation of deformation-induced martensite. The phase transformation led to a significant secondary cyclic hardening stage at high strain amplitude loading. The low cycle fatigue behaviour and principal fatigue life stages were characterized by the analysis of cyclic response. A vital supplementary data were obtained by the analysis of hysteresis loop shape carried out, for the first time on a phase-transforming material, by the generalized statistical theory. The analysis was able to follow the evolution of cyclic stress sources during the fatigue life, especially the increasing contribution of deformation-induced martensite. The identified features of cyclic plasticity were supported by electron channeling contrast imaging observations. Furthermore, electron backscatter diffraction revealed a distinct preferential localization of α’-martensite into macrobands parallel to rolling direction. Energy dispersive spectroscopy mapping identified pronounced chemical segregation of Cr and Ni which correlated well with the observed macrobands. These compositional fluctuations led to local austenite metastability which is enhanced further by the applied solution annealing.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/GJ19-25591Y" target="_blank" >GJ19-25591Y: Vliv mikrostruktury na únavové vlastnosti vysoce anisotropických nerezavějících ocelí vyrobených pomocí selektivního laserového tání</a><br>

Návaznosti

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

Rok uplatnění

2021

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 Properties Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Svazek periodika

824

Číslo periodika v rámci svazku

SEP

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

141807

Kód UT WoS článku

000687730000002

EID výsledku v databázi Scopus

2-s2.0-85111700573