Hot-cracking of high-alloyed steels evaluated by wedge rolling test

• Дата: 2008
• Автори: Schindler, I., Suchanek, P., Rusz, S., Kubecka, P., Sojka, J., Heger, M., Liska, M., Hlisnikovsky, M.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут проблем міцності ім. Г.С. Писаренко НАН України 2008
• Назва видання: Проблемы прочности
• Теми: Научно-технический раздел
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/48459
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Hot-cracking of high-alloyed steels evaluated by wedge rolling test / I. Schindler, P. Suchanek, S. Rusz, P. Kubecka, J. Sojka, M. Heger, M. Liska, M. Hlisnikovsky // Проблемы прочности. — 2008. — № 1. — С. 60-63. — Бібліогр.: 3 назв. — англ.

We present a new methodology of determination of hot-cracking f metallic materials, which is based on laboratory application of the wedge rolling test and computer processing of the results obtained. The experiment was made with selected new types of high-alloyed free-cutting (ferritic and austenitic) steels. The initial specimens underwent an additional modification enabling easier development of cracks which consisted in milling out of the defined V-shaped notches on a side wall of a specimen. After taking specimens from the rolled material, we performed the metallographic analysis of microstructures by means of optical microscopy as well as a SEM analysis of the cracks. The resulting microstructure in the propagating crack vicinity was markedly influenced by this fracture. In the crack vicinity, a noticeable refinement of grains was observed due to the stress-induced recrystallization and occurrence of deformation zones that were pronounced by the rolled-out and stretched sulphides. As a rule, fractures were created by the ductile failure with visible pits, caused by tearing of sulphides from the material. Susceptibility of the studied steels to hot-cracking was evaluated and compared.