Gas boriding of Inconel 600 alloy

• Autorzy: Makuch N. , Kulka M. , Dziarski P.

Warianty tytułu

PL

Borowanie gazowe stopu Inconel 600

• Języki publikacji: EN

Abstrakty

EN

The excellent resistance of Ni-based alloys to corrosion and oxidation has led them being used wherever corrosive media or high temperature are to be expected. However, if Ni-based alloys have to be applied under conditions of appreciable mechanical wear (adhesive or abrasive), these materials require suitable wear protection. Gas boriding in N2-H2-BCl3 atmosphere was proposed to formation of boride layers on Inconel 600 alloy. The process consisted in two stages, which were alternately repeated: saturation by boron and diffusion annealing. During first step BCl3 was added to N2-H2 atmosphere. Second step consisted in diffusion annealing while an addition of BCl3 was switched off. The process proved to be more economical in BCl3 consumption. The microstructure and some properties of produced layer were studied. Proposed gas boriding accelerated the diffusion of boron into the surface in comparison with other acceptable diffusion methods. The comparable thickness of boride layer was obtained after considerably shorter duration. X-ray microanalysis indicated the increased boron concentration in the layer. The occurrence of nickel borides (Ni2B, Ni3B and Ni4B3) as well as chromium or iron borides was expected in the boride layer. The significant improvement of hardness (up to 1400÷2200 HV) and abrasive wear resistance was observed as a consequence of gas boriding.

PL

Bardzo dobra odporność stopów niklu na korozję i utlenianie pozwala stosować je wszędzie tam, gdzie jest spodziewane agresywne środowisko lub wysoka temperatura. Jednak stosowanie tych stopów w warunkach znacznego zużycia mechanicznego (adhezyjnego lub ściernego) wymaga odpowiedniego zabezpieczenia. Borowanie gazowe w atmosferze N2-H2-BCl3 zaproponowano do wytwarzania warstwy borków na stopie Inconel 600. Proces składał się z dwóch etapów powtarzanych na przemian: nasycania borem i wyżarzania dyfuzyjnego. Podczas pierwszego etapu do atmosfery N2-H2 dodawano BCl3. Drugi etap polegał na wyżarzaniu, podczas którego dodawanie BCl3 wstrzymywano. Proces był bardziej ekonomiczny ze względu na ilość zużywanego BCl3. Badano mikrostrukturę i niektóre właściwości warstwy borowanej. Proponowane borowanie gazowe powodowało przyspieszenie dyfuzji boru do powierzchni w porównaniu z innymi metodami dyfuzyjnymi. Otrzymano porównywalną grubość warstwy borków po znacznie krótszym czasie trwania procesu. Mikroanaliza rentgenowska wskazała na zwiększone stężenie boru w warstwie. Prawdopodobnie w warstwie występują borki niklu (Ni2B, Ni3B i Ni4B3), jak również borki chromu lub żelaza. Zaobserwowano znaczne zwiększenie twardości (do 1400÷2200 HV) i odporności na ścieranie w wyniku gazowego borowania.

Słowa kluczowe

EN

gas boriding; Inconel 600 alloy; microstructure; hardness; abrasive wear resistance

PL

borowanie gazowe; Inconel 600; mikrostruktura; twardość; odporność na ścieranie

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2013
• Tom: Vol. 34, nr 6
• Strony: 745--748
• Opis fizyczny: Bibliogr. 42 poz., rys., tab.

Twórcy

autor

Makuch N.

• Instytut Inżynierii Materiałowej, Politechnika Poznańska

autor

Kulka M.

• Instytut Inżynierii Materiałowej, Politechnika Poznańska

autor

Dziarski P.

• Instytut Inżynierii Materiałowej, Politechnika Poznańska

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