The Paton Welding Journal, 2017, №08

2017 №08 (02)

DOI of Article 10.15407/tpwj2017.08.03

2017 №08 (04)

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TPWJ, 2017, #8, 18-23 pages
 
Increase of brittle fracture resistance of metal of heat-affected zone in railway wheel surfacing


Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                      0957-798X (print)
Issue                       #4, 2017 (August)
Pages                      18-23
 
 
Authors
O.A. Haivoronskyi, V.D. Poznyakov, L.I. Markashova, A.S. Shishkevich, V.A. Yashchuk and A.V. Klapatyuk
E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
Presented results are continuation of the complex investigations and refer to effect of low-temperature tempering, which is carried out in process of delayed cooling of products after welding, on mechanical properties and crack resistance of the joints of high-strength steel with 0.55–0.65 % carbon content. It is determined that tempering at 100 °C during four hours promotes rise of ductility property indices of quenched metal of heat-affected zone by 70 %, that of impact toughness 3 times, crack resistance 4.5 times, welded joint life duration 2 times. It is related with 1.5 times decrease of dislocation density in a volume of bainite and martensite laths as well as relaxation of stresses of II type. 14 Ref., 2 Tables, 7 Figures.
 
Keywords: high-strength carbon steel, arc welding, heat-affected zone, low-temperature tempering, mechanical properties, brittle fracture, life
 
 
Received:                12.04.17
Published:               01.08.17
 
 
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