The influence of heat treatment on microstructure and crack resistance of boron microalloyed steel plates

• Autorzy: Opiela M.
• Języki publikacji: PL

Abstrakty

EN

Purpose: The work presents results of investigation of heat treatment conditions influence on microstructure and crack resistance of C-Mn constructional steels with microaddition of boron assigned to be used in production of high strength steel plates. Design/methodology/approach: Metallographic observations, heat treatment, hardness measurements, impact strength examinations, fractographic analyses of fracture surfaces of test pieces have been performed. Findings: Dispersive particles of interstitial phases formed on dislocations during the plastic deformation, limiting grain growth of austenite, create the possibility to obtain metallurgical products with fine-grained microstructure giving them high strength and guaranteed crack resistance, also at low temperature. Research limitations/implications: Further research of microstructure in transmission electron microscope as well as complementary impact resistance tests at the temperature lower than -60°C are foreseen to be performed. Practical implications: Obtained results of examinations, especially detailed fractographic analysis of fracture surfaces of test pieces together with chemical composition analysis of revealed non-metallic inclusions and precipitations of secondary phases will make contribution to better understanding of cracking mechanisms in the group of high-strength steels. Originality/value: Performed research revealed that investigated steels present high crack resistance also at low temperature. It can be achieved through proper selection of chemical composition and adequate conditions of heat treatment and plastic working. The presence of microadditions of transition metals deriving from IVb and Vb group of periodic classification of the elements with high chemical affinity to nitrogen and carbon allows producing rolled products with high exploitation properties. Keywords: Metallic alloys; Heat treatment; Microalloyed steels; Heavy plates; Crack resistance

Słowa kluczowe

PL

stop metalowy; obróbka cieplna; stal mikrostopowa; odporność na pękanie

EN

metallic alloy; heat treatment; microalloyed steel; crack resistance; heavy plate

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2010
• Tom: Vol. 43, nr 1
• Strony: 117--124
• Opis fizyczny: Bibliogr. 16 poz., rys., tabl.

Twórcy

autor

Opiela M.

• Division of Constructional and Special Materials Engineering, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland,

Bibliografia

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