Duplex stainless steels are used for example in pulp and paper industry, chemical plants and offshore platforms. The advantages of duplex stainless steels are high resistances to pitting corrosion, stress corrosion cracking and corrosion fatigue. The experimental tests using Thermanit 2509 super duplex wire were performed with coaxial laser wire cladding head. Thermanit 2509 is austenite-ferrite stainless steel Fe-25Cr-10Ni-4Mo with high amount of alloying contents with excellent corrosion resistance. Corrosion properties of duplex hot-wire laser coatings were investigated by the critical pitting temperature (CPT) test. CPT values of duplex laser coating specimens were measured nearly consistent with 2507 wrought duplex steel. Microstructure phases of laser duplex coatings were investigated and compared to the objective 50-50% austenite-ferrite ratio.

Topics
Corrosion fatigue, Chemical plants, Chemical compounds, Ferromagnetic materials, Materials synthesis and processing
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