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PARAMETERS OF ADVANCED HIGH STRENGTH STEELS WELDABILITY
Authors: Schmidová Eva | Konečný Michal
Year: 2013
Type of publication: ostatní - článek ve sborníku
Name of source: Conference METAL 2013 Proceedings 22nd International Conference on Metallurgy and Materials METAL 2013
Publisher name: TANGER, spol. s r.o.
Place: Ostrava
Page from-to: 828-833
Titles:
Language Name Abstract Keywords
eng PARAMETERS OF ADVANCED HIGH STRENGTH STEELS WELDABILITY Lew alloy high strength steels are the key materials in the design of safety parts car body structures. Contribution is dedicated to the study of boron steel type of 22MnB5 voidability, with fully martensrtic microstructure due to hot stamping technology. The joints strength of the martensitic steels is limited mainly by the part of the heat affected zone with a predominance of a tempered martensite. The main objective of performed analyses is to study the differences in formation of the surface AISi layer. Those differences are one of the influential metallurgical parameters related to weldability of martensitic steels. The structure of sub layers and changes of their chemical composition were studed as a result of drfferent thermal conditions during heat treatment. The Si-rich zones formation in connection with overheating during austenitization is discussed. The spot welds service durability ii automotive structures is strongly affected by the failure mode, in conjunction with drfferent fracture energy. In order to evaluate the failure mode of the spot welds, the shear strength, i.e. shear force to the sheet-sheet interface was chosen as a testing mode. The fractography analysis was performed for documentation of the surface layers in their influence on the failure mode of spot welds. The typical differences in the fracture behavior low alloy martensitic steel are presented. weldability; martensitic steels; surface layer; fracture behavior

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