Thermal stability of dislocation structure and its effect on creep property in austenitic 316L stainless steel manufactured by directed energy deposition

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F23%3AN0000028" target="_blank" >RIV/26316919:_____/23:N0000028 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/23:10474186

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0921509323004057?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0921509323004057?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2023.144981" target="_blank" >10.1016/j.msea.2023.144981</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal stability of dislocation structure and its effect on creep property in austenitic 316L stainless steel manufactured by directed energy deposition

Popis výsledku v původním jazyce

The objective of this study is to investigate the thermal stability of dislocation structure and its effect on the creep behaviour of laser-directed energy deposited 316L stainless steel (L-DED-316L SS). Post-processing heat treatments at temperatures ranging from 300 to 1200 degrees C were performed on the as-deposited DED samples. The microstructural changes induced by the heat treatment were correlated to the corresponding variations of the room temperature tensile properties and creep behaviour at 650 degrees C/225 MPa. Results show that dislocations produced during DED process tend to distribute uniformly, with only a few localized fine dislocation cells (average cell size of -0.4 mu m) being detected. At 600 degrees C, the remaining dislocations rearrange and organize into a coarse dislocation cell structure with an average cell size of -1.6 mu m, leading to a slight decrease in yield strength, while the creep performance is not obviously affected. At 800 degrees C, the annihilation of dislocations and destruction of dislocation cell structure, as well as elemental diffusion contribute to a significant drop in yield strength and creep rupture time with a noticeable increase in steady creep rate. Further increasing heat treatment temperature above 1000 degrees C removes the dislocation cell structure and elemental segregation on cell walls, which results in a continuous increase in steady creep rate. The present work demonstrates that the presence of chemical micro-segregation is crucial for the stabilization of dislocation cells structure and the resulted creep performance of the heat-treated L-DED samples.

Název v anglickém jazyce

Thermal stability of dislocation structure and its effect on creep property in austenitic 316L stainless steel manufactured by directed energy deposition

Popis výsledku anglicky

The objective of this study is to investigate the thermal stability of dislocation structure and its effect on the creep behaviour of laser-directed energy deposited 316L stainless steel (L-DED-316L SS). Post-processing heat treatments at temperatures ranging from 300 to 1200 degrees C were performed on the as-deposited DED samples. The microstructural changes induced by the heat treatment were correlated to the corresponding variations of the room temperature tensile properties and creep behaviour at 650 degrees C/225 MPa. Results show that dislocations produced during DED process tend to distribute uniformly, with only a few localized fine dislocation cells (average cell size of -0.4 mu m) being detected. At 600 degrees C, the remaining dislocations rearrange and organize into a coarse dislocation cell structure with an average cell size of -1.6 mu m, leading to a slight decrease in yield strength, while the creep performance is not obviously affected. At 800 degrees C, the annihilation of dislocations and destruction of dislocation cell structure, as well as elemental diffusion contribute to a significant drop in yield strength and creep rupture time with a noticeable increase in steady creep rate. Further increasing heat treatment temperature above 1000 degrees C removes the dislocation cell structure and elemental segregation on cell walls, which results in a continuous increase in steady creep rate. The present work demonstrates that the presence of chemical micro-segregation is crucial for the stabilization of dislocation cells structure and the resulted creep performance of the heat-treated L-DED samples.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/EF16_019%2F0000836" target="_blank" >EF16_019/0000836: Výzkum pokročilých ocelí s unikátními vlastnostmi</a><br>

Návaznosti

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

Rok uplatnění

2023

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

876

Číslo periodika v rámci svazku

MAY 17 2023

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

9

Strana od-do

nestránkováno

Kód UT WoS článku

000991296100001

EID výsledku v databázi Scopus

2-s2.0-85152228804