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Characterization of a newly developed martensitic stainless steel powder for Laser and PTA cladding
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2015 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A newly developed martensitic stainless steel powder, called “powder A”, designed for surface coating with laser cladding and PTA cladding was characterized. The purpose with powder A is to achieve both good corrosion resistance and wear resistance in a stainless steel grade.

The investigation of powder A was divided into cladding characterization, microstructural investigation and a property comparison to existing grades 316 HSi and 431 L.

Powder A was successfully deposited with laser cladding, exhibiting a wide process window, and PTA cladding. In both cases no preheating was required and no cracks were formed.

The microstructure examination indicates that powder A has a martensitic structure possibly containing small amounts of ferrite in the grain boundaries. Thermodynamic calculations in computer software Thermo-Calc 4.1 supported this theory. The microstructure of powder A proved to be very stable over a wide range of cladding parameters.

Powder A was significantly harder than 316 HSi and 431 L and had better corrosion resistance than 431 L in a chloride environment. Powder A had similar corrosion properties as 316 HSi in the experiments made .The wear performance of the powder A coatings was similar to 431 L. This was surprising since the hardness of the powder A coatings is significantly higher compared to 431 L.  

Place, publisher, year, edition, pages
Keyword [en]
Martensitic stainless steel, steel powder, laser cladding, PTA cladding
National Category
Other Materials Engineering
URN: urn:nbn:se:kth:diva-163788OAI: diva2:802334
Subject / course
Materials and Process Design
Educational program
Master of Science in Engineering - Materials Design and Engineering
Available from: 2015-04-14 Created: 2015-04-12 Last updated: 2015-04-14Bibliographically approved

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