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Fatigue Resistance of Hot-dip Galvanized Hot-rolled and High- Silicon TRIP Steel
Last modified: 2013-05-03
Abstract
Automobile industry has to cope with the emergence of high strength steels, as TRIP
steel. Hot-dip galvanization is the most cost-effective technique to protect steel against corrosion.
It consists in dipping steel parts in a molten zinc bath at 450 centigrade. A reduction of fatigue
endurance has been noticed. Our study aims to point out the mechanisms responsible for this
degradation. Experimental tests were carried out so as to investigate two assumptions of
embrittlement: the cracking from the zinc coating layers and the modification of the mechanical
properties during the heat treatment in melted zinc. The main criterion was the fatigue lifetime.
Our results show that:
- The cracks in the coating are mostly stopped at the zinc-steel interface.
- The heat treatment increases the fatigue resistance.
The heat treatment is not responsible for the lifetime drop. The cracks in the zinc coating may not
cause the fracture.
steel. Hot-dip galvanization is the most cost-effective technique to protect steel against corrosion.
It consists in dipping steel parts in a molten zinc bath at 450 centigrade. A reduction of fatigue
endurance has been noticed. Our study aims to point out the mechanisms responsible for this
degradation. Experimental tests were carried out so as to investigate two assumptions of
embrittlement: the cracking from the zinc coating layers and the modification of the mechanical
properties during the heat treatment in melted zinc. The main criterion was the fatigue lifetime.
Our results show that:
- The cracks in the coating are mostly stopped at the zinc-steel interface.
- The heat treatment increases the fatigue resistance.
The heat treatment is not responsible for the lifetime drop. The cracks in the zinc coating may not
cause the fracture.
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