STRUCTURE OF HIGH-CARBON STEEL AFTER WELDING WITH RAPID COOLING

Autor:	Oleg Bykovskiy, Michail Jurievich Osipov, M. N. Brykov, V. G. Efremenko, Stanislav Berezhnyy, Michail Andrushchenko, Ivan Petryshynets, Olaf Hesse, Yurii Kalinin, Maik Kunert
Rok vydání:	2019
Předmět:	lcsh:TN1-997 Austenite Quenching austenite Heat-affected zone Materials science high carbon low-alloyed steels Metallurgy Metals and Alloys Welding Microstructure Carbide law.invention martensite law wear resistance Martensite welding Arc welding rapid cooling lcsh:Mining engineering. Metallurgy
Zdroj:	Acta Metallurgica Slovaca, Vol 25, Iss 2 (2019)
ISSN:	1338-1156 1335-1532
DOI:	10.12776/ams.v25i2.1269
Popis:	In this paper the effect of rapid cooling during arc welding on the structure of fusion layer and heat affected zone (HAZ) of high-carbon low alloyed steel have been studied. The main idea was that despite of high carbon content (1.2%) it is necessary to achieve quenching in HAZ. Due to proper chemical composition of welded steel martensite start temperature Ms is about 20 oC, therefore austenitic structure of quenched metal is preserved after rapid cooling. Exposition of HAZ to excessive heat during welding cycle leads to local precipitation of carbides from austenite and thus raising of Ms. In this case some amount of martensite was present in structure after cooling along with austenite and carbides. Microstructure, microhardness and chemical composition of remelted electrode metal, fusion zone and HAZ were studied by means of optical microscopy, SEM, EDX and microhardness testing.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3ec54bd0d92f515464450a846470f44 https://doi.org/10.12776/ams.v25i2.1269 Zobrazit plný text záznamu