scholarly journals The Corrosion Erossion of Ship Propeller Al 7075 Produced by Gravity Sand Casting

2019 ◽  
Vol 2 (2) ◽  
pp. 172-177
Author(s):  
Milka Rante ◽  
Muhammad Syahid ◽  
Onny Sutresman
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Erosion Resistance ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Al 7075 ◽  
Slurry Pot Tester ◽  
Mechanical Properties And Corrosion ◽  
Nickel Aluminum Bronze ◽  
Ship Propeller

Propeller is one of the important components of ships and boats that function as motor or boat propulsion. The mechanical properties required in propeller material are high toughness, easy to cast, and good engine capability, as well as good resistance to corrosion and erosion. One of the aluminum alloys that have been widely used in major vessels in propeller systems is the Nickel-aluminum-bronze (NAB) alloy because it has an excellent combination of mechanical properties and corrosion-erosion resistance. Another type of aluminum alloy that is widely used as a machining component is the Al 7075 T651 because it has the highest strength among other aluminum alloys. The mechanical properties of the Al 7075 T651 are directly proportional to the erosion resistance of the propeller which agrees with the pot tester porridge. The higher the value of the erosion propeller failure that occurs also increases with increasing testing rotational speed. For corrosion, a propeller with air testing media at a speed of 1000 rpm which results in significant corrosion products. Keywords: Al 7075 T651, Slurry Pot Tester, Corrosion Erosion

Enhancement of Ductility and Strength through Microstructural Refinement by FSP of Nickel Aluminum Bronze

2006 ◽  
Vol 503-504 ◽  
pp. 161-168 ◽  
Author(s):  
Keiichiro Oh-ishi ◽  
Alexandre P. Zhilyaev ◽  
Terry R. McNelley
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
Physical Metallurgy ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Microstructural Refinement ◽  
Friction Stir ◽  
Thermomechanical Cycle ◽  
Nickel Aluminum Bronze

Friction stir processing (FSP) is a severe plastic deformation (SPD) method that has been applied to as-cast NiAl bronze (NAB) materials, which are widely used for marine components. The thermomechanical cycle of FSP results in homogenization and refinement, and the selective conversion of microstructures from a cast to a wrought condition. The physical metallurgy of NAB is complex and interpretation of the effects of FSP on microstructure has required detailed analysis by optical and electron microscopy methods. Annealing and isothermal hot rolling have been employed to confirm microstructure-based estimates of stir-zone peak temperatures. The variation of mechanical properties was assessed by use of miniature tensile samples and correlated with microstructure for samples from stir zones of single and multi-pass FSP. Exceptional improvement in strength – ductility combinations may be achieved by FSP of NAB materials.

Mechanical Properties at High Temperatures and Microstructures of a Nickel Aluminum Bronze Alloy

2013 ◽  
Vol 683 ◽  
pp. 82-89 ◽  
Author(s):  
Borpit Thossatheppitak ◽  
Surasak Suranuntchai ◽  
Vitoon Uthaisangsuk ◽  
Anchalee Manonukul ◽  
Pinai Mungsuntisuk
Keyword(s):  
Mechanical Properties ◽  
High Temperatures ◽  
Flow Behavior ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Bronze Alloy ◽  
Heat Treated ◽  
Different Temperatures ◽  
Machine Parts ◽  
Nickel Aluminum Bronze

Nickel Aluminum Bronze (NAB) alloys have been widely used in different kinds of machine parts where the superior resistance to corrosion and erosion in saltwater is needed. In this work, mechanical properties at high temperatures and microstructures of a NAB alloy were investigated. First, NAB specimens were prepared as an as-cast ingot and were subsequently heat-treated at 675°C for 6 hours in order to improve microstructure and mechanical properties. The mechanical properties at high temperatures in form of the plastic flow curves of the NAB alloy were characterized by a deformation dilatometer. The NAB samples were compressed at high temperature and rapidly cooled down to room temperature. The deformation temperatures of 825°C, 850°C and 900°C, a strain rate of 0.01 s-1, and a maximum compression strain of 0.4 were considered. The influences of the temperature on flow behavior of the NAB alloy were investigated. The plastic stress-strain curves at different temperatures were compared with regard to the rate of material strain hardening and softening. It was found that the compression stresses decreased with increasing temperatures. Additionally, the resulted hardness and microstructures of the alloy after forming at high temperatures were analyzed.

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

2020 ◽  
Vol 36 ◽  
pp. 101510
Author(s):  
C. Dharmendra ◽  
B.S. Amirkhiz ◽  
A. Lloyd ◽  
G.D. Janaki Ram ◽  
M. Mohammadi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatments ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nickel Aluminum Bronze

The Dry Sliding Behavior of Aluminum Alloys Against Steel in Sheave Wheel Applications

2000 ◽  
Vol 123 (4) ◽  
pp. 676-681 ◽  
Author(s):  
R. W. Goldman ◽  
A. E. Segall ◽  
J. C. Conway
Keyword(s):  
Aluminum Alloys ◽  
Solidus Temperature ◽  
Wear Test ◽  
Mode Analysis ◽  
Dry Sliding ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Test Configuration ◽  
Steel Cables ◽  
Nickel Aluminum Bronze

The dry sliding behavior of various 2xxx and 7xxx aluminum alloys with and without nickel-aluminum bronze-coatings were evaluated for industrial sheave wheel applications involving steel cables. In order to simulate the wear caused by a cable within the sheave groove, wear tests were conducted using a pin-on-ring wear test configuration. For these tests, the various aluminum alloys were worn against a 387 steel using an interfacial pressure of 13.9 MPa and a sliding velocity of 9.42 m/s. Results indicated that for the conditions studied, the 7xxx aluminum alloys exhibited a superior wear resistance relative to the 2xxx aluminum alloys with and without nickel-aluminum bronze coatings. A wear mode analysis based upon optical and electron microscopy revealed material removal mechanisms dominated by adhesive and abrasive wear. Moreover, a statistical analysis indicated a potential relationship between wear rate and a combination of yield strength, solidus temperature and post-wear inverse hardness.

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