Mechanical properties of the GX12CrMoVNbN91 (GP91) cast steel after different heat treatments

• Дата: 2012
• Автор: Golański, G.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-механічний інститут ім. Г.В. Карпенка НАН України 2012
• Назва видання: Фізико-хімічна механіка матеріалів
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/139763
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Mechanical properties of the GX12CrMoVNbN91 (GP91) cast steel after different heat treatments / G. Golański // Фізико-хімічна механіка матеріалів. — 2012. — Т. 48, № 3. — С. 110-116. — Бібліогр.: 15 назв. — англ.

The paper presents results of research on the influence of multistage heat treatment of different types on the microstructure and properties of high-chromium martensitic GX12CrMoVNbN9-1 (GP91) steel. The material under investigation were samples taken out from a test coupon. Heat treatment of GP91 cast steel was performed at the parameters of temperature and time typical of treatment for multi-ton steel casts. The research has proved that in the as-cast state the GP91 cast steel was characterized by a coarse grain microstructure of lath martensite with precipitations of carbides such as: M₂₃C₆, M3C and NbC. The cast steel microstructure in the as-cast state ensured the required standard mechanical properties. Heat treatment of GP91 cast steel contributed to the obtainment of a fine grain microstructure of high tempered lath martensite with numerous precipitations of M₂₃C₆ and MX carbides of diverse size. The GP91 cast steel structure received by heat treatment made it possible to obtain high plastic properties, mainly impact strength, maintaining strength properties (yield strength (YS)) on the level of the required minimum.