Evaluation of halide-activated pack boriding of INCONEL 722
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Table I.
Nominal Chemical Composition of INCONEL 722 Element
Wt Pct
Ni Cr Fe Ti Si Al C
bal. 16.53 8.49 2.68 0.86 0.78 0.04
degrade the protective oxide leading to adhesive wear and high coefficients of friction.[8] The boriding process can be used to create a hard, tough nickel boride surface layer that is resistant to both corrosion and wear. The purpose of the present work is to evaluate the formation of boride phases using a halide-activated pack cementation technique and to measure the case depth and surface hardness in an annealed and annealed plus aged nickel-base alloy. The material used in this investigation was INCONEL* *INCONEL is a trademark of INCO Alloys International, Inc., Huntington, WV.
Evaluation of Halide-Activated Pack Boriding of INCONEL 722 W. MUHAMMAD, K. HUSSAIN, A. TAUQIR, A. UL HAQ, and A.Q. KHAN Boriding is a thermochemical surface treatment that involves the formation of surface compounds and the diffusion of boron into the substrate at high temperature. The metal boride compounds formed exhibit higher hardness, increased resistance to acid corrosion, and improved service life of the component. A series of articles on the boriding of steel were published, which discussed different boriding techniques, the effect of alloying elements, resistance to oxidation, etc.[1–7] Limited work was published on the boriding of nickel-base alloys. Nickel-base alloys are commonly used in aggressive environments because of their exceptional resistance to gaseous oxidation and aqueous corrosion. However, nickel-base alloys are susceptible to adhesive wear.[8] The problem is particularly acute in applications that expose components to hot acidic electrolytes that can remove the protective nickel/chrome oxide surface layer. In certain situations, the surfaces of nickel-base alloy components such as gates, balls and seats, or threaded linear actuators, even under moderate contact
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