Microstructure – Toughness relationships in sub-zero treated and tempered Vanadis 6 steel compared to conventional treatment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00480853" target="_blank" >RIV/68081723:_____/17:00480853 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0921509317308936" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921509317308936</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2017.07.007" target="_blank" >10.1016/j.msea.2017.07.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure – Toughness relationships in sub-zero treated and tempered Vanadis 6 steel compared to conventional treatment

Popis výsledku v původním jazyce

The influence of sub-zero treatment and tempering on the microstructure, flexural strength, and fracture toughness of Cr-V ledeburitic steel was examined with reference to the same material processed without the subzero period. The experimental results lead to the following findings: (i) Sub-zero treatment induces a considerable reduction of the amount of retained austenite, refinement of newly formed martensite, and increase in population density of small globular carbides. (ii) The hardness is improved by the sub-zero treatment in the prior-to-tempering state as well as in the state after low-temperature tempering, after high-temperature tempering, the situation is changed in favour of conventionally quenched specimens, whereas the secondary hardening peak disappears in sub -zero treated steel. This is due to combined effect of the population density decrease of small globular carbides, accelerated decomposition rate of retained austenite, coarsening of cementitic precipitates, and retardation of precipitation of stable M7C3 carbide. (iii) There is almost no effect of sub-zero treatment on the flexural strength in the low-temperature tempering range but this property is improved after tempering into the secondary hardening range. Sub -zero treatment causes a worsening of fracture toughness after low-temperature tempering but a slight improvement after tempering in the secondary hardening temperature range.

Název v anglickém jazyce

Microstructure – Toughness relationships in sub-zero treated and tempered Vanadis 6 steel compared to conventional treatment

Popis výsledku anglicky

The influence of sub-zero treatment and tempering on the microstructure, flexural strength, and fracture toughness of Cr-V ledeburitic steel was examined with reference to the same material processed without the subzero period. The experimental results lead to the following findings: (i) Sub-zero treatment induces a considerable reduction of the amount of retained austenite, refinement of newly formed martensite, and increase in population density of small globular carbides. (ii) The hardness is improved by the sub-zero treatment in the prior-to-tempering state as well as in the state after low-temperature tempering, after high-temperature tempering, the situation is changed in favour of conventionally quenched specimens, whereas the secondary hardening peak disappears in sub -zero treated steel. This is due to combined effect of the population density decrease of small globular carbides, accelerated decomposition rate of retained austenite, coarsening of cementitic precipitates, and retardation of precipitation of stable M7C3 carbide. (iii) There is almost no effect of sub-zero treatment on the flexural strength in the low-temperature tempering range but this property is improved after tempering into the secondary hardening range. Sub -zero treatment causes a worsening of fracture toughness after low-temperature tempering but a slight improvement after tempering in the secondary hardening temperature range.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LM2015069" target="_blank" >LM2015069: Infrastruktura pro studium a aplikaci pokročilých materiálů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

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

ISSN

0921-5093

e-ISSN

—

Svazek periodika

702

Číslo periodika v rámci svazku

AUG

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

18

Strana od-do

241-258

Kód UT WoS článku

000407983500028

EID výsledku v databázi Scopus

2-s2.0-85024477040