The effect of heat input on the microstructure and properties of nickel aluminum bronze laser clad with a consumable of composition Cu-9.0Al-4.6Ni-3.9Fe-1.2Mn

Abstract

The effect of heat input in the laser cladding of nickel aluminum bronze was investigated. Nickel aluminum bronze castings were clad with a consumable of the composition Cu-9.0Al-4.6Ni-3.9Fe-1.2Mn and exposed to a variety of heat inputs from 42.5 to 595 J/mm. At the lowest heat input, the deposit microstructure was almost entirely martensitic. Increases in heat input caused the amount of ␣ to increase. Depending upon heat input, the ␣ was present as grain boundary allotriomorphs, secondary Widmanstätten ␣ sideplates, and intragranular Widmanstätten ␣ precipitates. The reheated zones were of lower hardness and, at all heat inputs, consisted of a mixture of grain boundary allotriomorphs and Widmanstätten ␣ and martensite. Laser cladding improved the corrosion-and cavitation-erosion resistance of the surfaces but reduced their ductility. The properties of the clad surfaces depended on heat input.

Wire-arc additive manufactured nickel aluminum bronze with enhanced mechanical properties using heat treatments cycles

“…This is reflected in almost similar tensile properties of HT-1 and as-fabricated samples. These results are consistent with several previous reports [10,20,[29][30][31][32][33][34] in both casting and welding literature on NAB. Based on the current findings, it appears that stress-relieving of WAAM-NAB samples can be safely carried out at 350 °C without any concerns about unintended microstructural changes.…”

Wire-arc additive manufacturing of nickel aluminum bronze/stainless steel hybrid parts – Interfacial characterization, prospects, and problems

“…In the literature, few works reported on laser surface modification techniques such as surface melting and cladding for the repair of cast NAB alloy components [13][14][15][16][17][18] . However, minimal work is published on arc (weld) deposition of NAB [ 19 , 20 ], that too on a cast-NAB (similar composition) substrate.…”

Laser Materials Processing for Improved Corrosion Performance

“…Another example of this is the laser heat treatment of nickel-aluminium bronze (NAB). LC of NAB produces the Widmanstatten morphology microstructure, which has poor corrosion properties [33]. Whereas the LHT of NAB produces a microstructure that is free form precipitates, Figure 4, which is responsible for the reduced corrosion performance and is free from the Widmanstatten morphology microstructure [34].…”