Corrosion Fatigue Behaviour of Nickel-Aluminum Bronze Alloys

Corrosion and Corrosion Fatigue Characteristics of Cast NAB Coated with NAB by HVOF Thermal Spray

“…This value corresponds well with previously reported corrosion fatigue strengths of cast NAB alloys, which are in the range of 87 to 122 MPa. [6][7][8]12 On the other hand, a HVOF-NAB-coated NAB bar specimen was not fractured up to 10 8 cycles under cyclic loading of 140 MPa. This superior resistance to corrosion fatigue of HVOF-NAB-coated cast NAB compared to cast NAB can be explained by investigating the fractured surfaces of bar specimens.…”

“…1 In consideration of harsh environments in which ship propellers operate, Ni-Al bronze (NAB) alloy, which is highly resistive to corrosion and cavitation, has been used for ship propellers especially operating in sea water. Previous studies of corrosion, [2][3][4] cavitation-erosion, 5 and corrosion fatigue [6][7][8] of cast NAB alloys in sea water or NaCl solutions confirmed that NAB has a good resistance to corrosion, cavitation damage, and cyclic mechanical load. It was also reported that corrosion fatigue property is directly related to the resistance to cavitation-erosion.…”

A review of the corrosion behavior of conventional and additively manufactured nickel–aluminum bronze (NAB) alloys: current status and future challenges

“…95 In contrast, heat-treated NABs with a precipitated secondary phase exhibited higher SCC resistance, indicating that the absence of eutectoid microstructure and b 0 phase can improve SCC resistance. 3 Conversely, the corrosion fatigue crack growth rate of NABs appeared to be independent of heat treatment and solution type, 138 but decreasing loading frequency, increasing stress ratio, and decreasing stress intensity factor were found to raise crack growth rate. 7 The corrosion behavior of AMed NAB alloys, along with other Cu-base alloys, as reported in the present literature, is summarized in Table 11.…”

“…In one research study, the CF behaviors of as-cast and normalized NAB samples were compared. 138 The results indicated that the fatigue crack growth rates were not dependant on the test environment (air or brine solution) or heat treatment, although the CF strength of the normalized alloy was 10% greater than that of the as-cast counterpart. 138 In other works, the CF characteristics of NAB alloy were analyzed as a function of variation in stress intensity factor (Δ K ), stress ratio ( R = K min / K max ), and loading frequency.…”

“…138 The results indicated that the fatigue crack growth rates were not dependant on the test environment (air or brine solution) or heat treatment, although the CF strength of the normalized alloy was 10% greater than that of the as-cast counterpart. 138 In other works, the CF characteristics of NAB alloy were analyzed as a function of variation in stress intensity factor (Δ K ), stress ratio ( R = K min / K max ), and loading frequency. 7 It was found that the loading frequency had the most profound effect on the CF crack growth rate, as hydrogen-induced embrittlement enhanced the mobility of dislocations, weakened interatomic bonds, and caused localized plastic deformation.…”