Sub-transus transformation-driven softening in Ti-6Al-2Sn-4Zr-2Mo alloy additively manufactured using laser powder bed fusion

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510959" target="_blank" >RIV/00216208:11320/25:10510959 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=I9ZxsFnOdb" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=I9ZxsFnOdb</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2025.148530" target="_blank" >10.1016/j.msea.2025.148530</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sub-transus transformation-driven softening in Ti-6Al-2Sn-4Zr-2Mo alloy additively manufactured using laser powder bed fusion

Popis výsledku v původním jazyce

In the present work, the high-temperature phase stability and the correlated flow stress softening of Ti-6 %Al-2 %Sn-4 %Zr-2 %Mo alloy (Ti-6242) fabricated through the laser powder bed fusion process were studied. Toward this end, a set of hot compression tests were conducted at 700, 800, 900 and 1000 degrees C under the strain rate of 0.001s(-1). A distinct observation was the occurrence of a significant strength drop and notable flow softening after reaching the maximum stress at all thermomechanical conditions. The peak stress was significantly dropped (similar to 490 MPa) with increasing temperature from 700 degrees C to 800 degrees C, proposing activation of a new emerging softening mechanism. The alpha &apos; martensitic starting microstructure extensively started to decompose at around 800 degrees C, leading to the formation of alpha and beta grains, where the beta phase fraction was considerably increased by approaching the beta transus temperature. The reverse transformation of the martensite served as an effective softening mechanism, owing to the fact that the alpha and beta phases represent higher capability for strain accommodation. At 900 degrees C and 1000 degrees C, the penetration of beta phases through the alpha lamellae and the occurrence of alpha-globularization was clearly evident, contributing to the flow softening at elevated temperatures. A preferred texture towards the &lt;2-1-10&gt; and &lt;0001&gt; orientations was also recognized in the microstructure deformed at 800 degrees C and 900 degrees C, which proposed the contribution of texture weakening as an additional factor in flow softening.

Název v anglickém jazyce

Sub-transus transformation-driven softening in Ti-6Al-2Sn-4Zr-2Mo alloy additively manufactured using laser powder bed fusion

Popis výsledku anglicky

In the present work, the high-temperature phase stability and the correlated flow stress softening of Ti-6 %Al-2 %Sn-4 %Zr-2 %Mo alloy (Ti-6242) fabricated through the laser powder bed fusion process were studied. Toward this end, a set of hot compression tests were conducted at 700, 800, 900 and 1000 degrees C under the strain rate of 0.001s(-1). A distinct observation was the occurrence of a significant strength drop and notable flow softening after reaching the maximum stress at all thermomechanical conditions. The peak stress was significantly dropped (similar to 490 MPa) with increasing temperature from 700 degrees C to 800 degrees C, proposing activation of a new emerging softening mechanism. The alpha &apos; martensitic starting microstructure extensively started to decompose at around 800 degrees C, leading to the formation of alpha and beta grains, where the beta phase fraction was considerably increased by approaching the beta transus temperature. The reverse transformation of the martensite served as an effective softening mechanism, owing to the fact that the alpha and beta phases represent higher capability for strain accommodation. At 900 degrees C and 1000 degrees C, the penetration of beta phases through the alpha lamellae and the occurrence of alpha-globularization was clearly evident, contributing to the flow softening at elevated temperatures. A preferred texture towards the &lt;2-1-10&gt; and &lt;0001&gt; orientations was also recognized in the microstructure deformed at 800 degrees C and 900 degrees C, which proposed the contribution of texture weakening as an additional factor in flow softening.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Materials Science &amp; Engineering A: Structural Materials: Properties, Microstructure and Processing

ISSN

0921-5093

e-ISSN

1873-4936

Svazek periodika

940

Číslo periodika v rámci svazku

neuveden

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

13

Strana od-do

148530

Kód UT WoS článku

001500956400001

EID výsledku v databázi Scopus

2-s2.0-105005841567