Creep behaviour of IN 740 alloy after HAZ thermal cycle simulations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F19%3A00510362" target="_blank" >RIV/68081723:_____/19:00510362 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0308016117301692?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0308016117301692?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijpvp.2019.104000" target="_blank" >10.1016/j.ijpvp.2019.104000</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Creep behaviour of IN 740 alloy after HAZ thermal cycle simulations

Popis výsledku v původním jazyce

In this study, the creep specimens of an age-hardened IN 740 alloy were subjected to heat affected zone (HAZ) thermal cycle simulations using a Gleeble 380 physical simulator. The short-term uniaxial creep tests in tension were carried out at temperatures of 973 and 1023 K and at applied stresses ranging from 220 to 600 MPa to evaluate the effect of welding simulations on the microstructural evolution, creep properties and behaviour of the IN 740 alloy. It was found that the stress exponent, n, of the minimum creep rate is not constant and the evaluated values of n are of the order of ~3 for lower stresses, with the gradual variation of n with an increase of the applied stress up to ~15 at the highest stresses, indicating that the creep testing was carried out in the power-law (dislocation) creep region. Analysis of the creep data leads to the conclusion that the creep behaviour of the simulated HAZ of the IN 740 alloy arises from a synergism between the deformation process that is based on intragranular dislocation processes, involving the glide and climb of mobile dislocations, and grain boundary mediated processes. Finally, an assumption was proposed that both creep deformation and fracture are controlled by the same mechanism(s). Examination of the creep fracture surfaces revealed that the main fracture mode is mixed-mode fracture with dominating intergranular character.

Název v anglickém jazyce

Creep behaviour of IN 740 alloy after HAZ thermal cycle simulations

Popis výsledku anglicky

In this study, the creep specimens of an age-hardened IN 740 alloy were subjected to heat affected zone (HAZ) thermal cycle simulations using a Gleeble 380 physical simulator. The short-term uniaxial creep tests in tension were carried out at temperatures of 973 and 1023 K and at applied stresses ranging from 220 to 600 MPa to evaluate the effect of welding simulations on the microstructural evolution, creep properties and behaviour of the IN 740 alloy. It was found that the stress exponent, n, of the minimum creep rate is not constant and the evaluated values of n are of the order of ~3 for lower stresses, with the gradual variation of n with an increase of the applied stress up to ~15 at the highest stresses, indicating that the creep testing was carried out in the power-law (dislocation) creep region. Analysis of the creep data leads to the conclusion that the creep behaviour of the simulated HAZ of the IN 740 alloy arises from a synergism between the deformation process that is based on intragranular dislocation processes, involving the glide and climb of mobile dislocations, and grain boundary mediated processes. Finally, an assumption was proposed that both creep deformation and fracture are controlled by the same mechanism(s). Examination of the creep fracture surfaces revealed that the main fracture mode is mixed-mode fracture with dominating intergranular character.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

International Journal of Pressure Vessels and Piping

ISSN

0308-0161

e-ISSN

—

Svazek periodika

178

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

104000

Kód UT WoS článku

000501396700001

EID výsledku v databázi Scopus

2-s2.0-85073994783