Abstract
The annealing procedure is crucial to promote the quality of Al-killed steels, which are widely used in the automotive industry. The continuous annealing (CA) has a potential to replace the batch annealing (BA) due to its benefits of higher efficiency and energy saving. Unfortunately, the yield point phenomena would be easily induced during the mechanical process after the treatment of CA. The tensile behavior, the grain size and the interstitial atom quantity of BA or CA treated samples with and without aging treatment were investigated to understand the reason for appearance of yield phenomena. Tensile tests showed the yield point was observed in the CA sample after aging treatment. Atom probe analyses presented that the content of interstitial carbon atom are very low in both BA and CA samples. Additionally, the grain size of BA sample is larger than CA. Finally, the reason of yield point appearance is discussed.
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