Microstructure and high temperature mechanical properties of refractory Cr-Nb-Ti-Zr alloy prepared by laser directed energy deposition

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F25%3AN0000030" target="_blank" >RIV/26316919:_____/25:N0000030 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352492825014631" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352492825014631</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mtcomm.2025.112951" target="_blank" >10.1016/j.mtcomm.2025.112951</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure and high temperature mechanical properties of refractory Cr-Nb-Ti-Zr alloy prepared by laser directed energy deposition

Popis výsledku v původním jazyce

The microstructure and mechanical properties of Cr-Nb-Ti-Zr complex concentrated alloy (CCA) prepared from the blend of elemental powders by laser directed energy deposition (L-DED) technique were investigated. Variation of the laser power and laser-induced substrate platform preheating were utilized to deposit 3D bulk samples. Deposition at maximum laser power of 500 W followed by long-term homogenization heat treatment at 1200 degrees C results in the crack free, locally homogeneous material. The final chemical composition of the deposited sample Cr15-Nb28-Ti23-Zr34 differs from the equimolar composition of the blended elemental powders due to Cr evaporation during deposition. The homogenized microstructure is formed by equiaxed grains with the size below 100 mu m and fine Cr2(Zr, Nb, Ti) Laves phase particles dispersed predominantly at grain boundaries. Mechanical properties were investigated by compression tests at RT, 400 degrees C and 800 degrees C. At RT, the homogenized alloy exhibits yield stress of 1558 MPa (ductility is about 8 %). Deformation at 400 degrees C decreases the yield stress by 20 %, while the ductility remained unchanged. Serrated flow appearing at compression curves at 400 degrees C can be attributed to the PLC effect. It was shown that L-DED technique can produce refractory CCAs directly from elemental powders by careful optimization of processing parameters. Deposition with a thermally insulating platform effectively suppresses crack formation and reduces the number of unmelted Nb particles. However, the utilization of the homogenization heat treatment after the deposition is required to achieve microstructural homogeneity at the length-scale of powder particles (tens of micrometers).

Název v anglickém jazyce

Microstructure and high temperature mechanical properties of refractory Cr-Nb-Ti-Zr alloy prepared by laser directed energy deposition

Popis výsledku anglicky

The microstructure and mechanical properties of Cr-Nb-Ti-Zr complex concentrated alloy (CCA) prepared from the blend of elemental powders by laser directed energy deposition (L-DED) technique were investigated. Variation of the laser power and laser-induced substrate platform preheating were utilized to deposit 3D bulk samples. Deposition at maximum laser power of 500 W followed by long-term homogenization heat treatment at 1200 degrees C results in the crack free, locally homogeneous material. The final chemical composition of the deposited sample Cr15-Nb28-Ti23-Zr34 differs from the equimolar composition of the blended elemental powders due to Cr evaporation during deposition. The homogenized microstructure is formed by equiaxed grains with the size below 100 mu m and fine Cr2(Zr, Nb, Ti) Laves phase particles dispersed predominantly at grain boundaries. Mechanical properties were investigated by compression tests at RT, 400 degrees C and 800 degrees C. At RT, the homogenized alloy exhibits yield stress of 1558 MPa (ductility is about 8 %). Deformation at 400 degrees C decreases the yield stress by 20 %, while the ductility remained unchanged. Serrated flow appearing at compression curves at 400 degrees C can be attributed to the PLC effect. It was shown that L-DED technique can produce refractory CCAs directly from elemental powders by careful optimization of processing parameters. Deposition with a thermally insulating platform effectively suppresses crack formation and reduces the number of unmelted Nb particles. However, the utilization of the homogenization heat treatment after the deposition is required to achieve microstructural homogeneity at the length-scale of powder particles (tens of micrometers).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/TK04020331" target="_blank" >TK04020331: Aditivní výroba komponent jaderného paliva</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

MATERIALS TODAY COMMUNICATIONS

ISSN

—

e-ISSN

2352-4928

Svazek periodika

47

Číslo periodika v rámci svazku

JUL 2025

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

nestránkováno

Kód UT WoS článku

001506825000012

EID výsledku v databázi Scopus

2-s2.0-105007158190