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

Result code in 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>

Alternative codes found

RIV/00216208:11320/23:10474186

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20301 - Mechanical engineering

Project

<a href="/en/project/EF16_019%2F0000836" target="_blank" >EF16_019/0000836: Research of advanced steels with unique properties</a><br>

Continuities

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

Publication year

2023

Confidentiality

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

Name of the periodical

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

ISSN

0921-5093

e-ISSN

1873-4936

Volume of the periodical

876

Issue of the periodical within the volume

MAY 17 2023

Country of publishing house

CH - SWITZERLAND

Number of pages

9

Pages from-to

nestránkováno

UT code for WoS article

000991296100001

EID of the result in the Scopus database

2-s2.0-85152228804