Abstract
Mechanical performance of heavy gauge press hardened steel modified with Nb and Mo additions on GMAW welded joints
Highlights
The increasing effort of the automobile industry in the search of mass reduction and the increase of vehicles safety demands the use of structural components made with higher mechanical resistance steels
The 22MnB5+NbMo microstructural analysis before and after hot forming process are show in Figures 2a, b, respectively. Through this analysis it was possible to notice that the microstructure of 22MnB5 + Nb+Mo in its initial condition is composed of a mixture of ferrite and perlite, while the base material after hot stamping revealed a refined microstructure entirely martensitic
Between the molten zone and the heat affected zone (HAZ), the precipitation of carbides in grain boundary was observed, as well as a refined microstructure composed of Widmanstätten ferrite, as well as bainite
Summary
The increasing effort of the automobile industry in the search of mass reduction and the increase of vehicles safety demands the use of structural components made with higher mechanical resistance steels. In this context, as presented by Hein [1], 22MnB5 press hardening steel (PHS) was developed with the aim of improving the structural parts and high strength reinforcements production and performance by the use of hot stamping technology. Bian et al [4] discovered that Nb microalloying can reduce sensitivity to hydrogen embrittlement-induced cracks due to hydrogen trapping and grain refinement, and, by adding 0.05 w.% Nb, critical fracture stress can be increased more than double
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