Mechanical properties and fracture behavior of high-strength steels

• Дата: 2008
• Автори: Musalek, R., Hausild, P., Siegl, J., Bensch, J., Slama, J.
• 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/123456789/48419
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Mechanical properties and fracture behavior of high-strength steels / R. Musalek, P. Hausild, J. Siegl, J. Bensch, J. Slama // Проблемы прочности. — 2008. — № 1. — С. 155-158. — Бібліогр.: 5 назв. — англ.

Typical thicknesses ofhigh-strength steels (HSS) sheets used in the car industry are inapplicablefor standardized testingprocedures. The aim ofthis study is topropose an appropriate methodologyfor testing and comparing of thin HSS sheets. Microstructures were observed by means of light and scanning electron microscopy. The modified Charpy impact tests andfracture toughness tests were used in order to compare thefracture properties of three different HSS sheets (Docol 1200 M, Multiphase 1200 and BTR 165). Ductile-to-brittle transition curves and tearing resistance (J —Δα) curves were measured. From thefracture toughness linked to the specimen thicknesses the value of fracture toughness KIc was estimated. Fractographic analysis of broken specimens has revealed that due to the fine microstructure of mixed ferrite-martensite fracture mechanism remains ductile even at low temperatures (down to —100° C).