Effects of Cooling Rate on the volume fraction of retained austenite in high-strenght MN-SI steels

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F19%3A43953982" target="_blank" >RIV/49777513:23210/19:43953982 - isvavai.cz</a>

Result on the web

<a href="http://www.qip-journal.eu/index.php/ams/article/view/1266" target="_blank" >http://www.qip-journal.eu/index.php/ams/article/view/1266</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12776/ams.v25i2.1266" target="_blank" >10.12776/ams.v25i2.1266</a>

Result language

angličtina

Original language name

Effects of Cooling Rate on the volume fraction of retained austenite in high-strenght MN-SI steels

Original language description

Various ways are sought today to increase mechanical properties of steels while maintaining their good strength and ductility. Besides effective alloying strategies, one method involves preserving a certain amount of retained austenite in a martensitic matrix. The steel which was chosen as an experimental material for this investigation contained 2.5% manganese, 2.09% silicon and 1.34% chromium, with additions of nickel and molybdenum. An actual closed-die forged part was made of this steel. This forged part was fitted with thermocouples attached to its surface and placed in its interior and then treated using the Q&amp;P process. Q&amp;P process is characterized by rapid cooling from a soaking temperature to a quenching temperature, which is between the Ms and the Mf, and subsequent reheating to and holding at a partitioning temperature where retained austenite becomes stable. The quenchant was hot water. Cooling took place in a furnace. Heat treatment profiles were constructed from the thermocouple data and the process was then replicated in a thermomechanical simulator. The specimens obtained in this manner were examined using metallographic techniques. The effects of cooling rate on mechanical properties and the amount of retained austenite were assessed. The resultant ultimate strength was around 2100 MPa. Elongation and the amount of retained austenite were 15% and 17%, respectively. Microstructures and mechanical properties of the specimens were then compared to the real-world forged part in order to establish whether physical simulation could be employed for laboratory-based optimization of heat treatment of forgings.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/LO1502" target="_blank" >LO1502: Development of Regional Technological Institute</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Acta Metallurgica Slovaca

ISSN

1335-1532

e-ISSN

—

Volume of the periodical

25

Issue of the periodical within the volume

2

Country of publishing house

SK - SLOVAKIA

Number of pages

8

Pages from-to

93-100

UT code for WoS article

000473306000002

EID of the result in the Scopus database

2-s2.0-85070680349