Avtomaticheskaya Svarka (Automatic Welding), #8, 2017, pp. 22-28
Increase of brittle fracture resistance of metal of heat-affected zone in railway wheel surfacing
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: email@example.com
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.
high-strength carbon steel, arc welding, heat-affected zone, low-temperature tempering, mechanical properties, brittle fracture, life
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