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The aim of this study is to investigate the microstructure and wear behavior of laser cladding Co-based alloy coating on single wheel or rail material (the laser cladding coating is applied only to the wheel or to the rail) using a rolling–sliding wear test apparatus. The coating of laser cladding Co-based alloy consists of dendrite and eutectic. Single-treated wheel or rail specimen undergone the...
Finding a wear law that is valid over a wide range of conditions and materials would have enormous practical value. The authors have previously discovered a simple relationship describing the evolution of the abrasive wear rate of steel sliding against boron carbide-coated coupons, and have developed a model accounting for its kinetics. The authors show here that this wear equation accurately describes...
The hot erosion resistance of two new iron-based coatings sprayed by high velocity continuous combustion (HVCC) process was studied using a nozzle type elevated temperature erosion tester. The coating samples were prepared under as-deposited, post heat-treated and sealed plus heat-treated conditions. For comparison, AISI 1018 low carbon steel, two existing HVCC iron-based coatings, and two high velocity...
The high velocity oxygen fuel (HVOF) sprayed chromium carbide-metal cermet coatings have shown some attractive behavior, which makes them superior to arc-sprayed iron base coatings in preventing erosion. While their hot erosion behavior and its dependence on carbide/metal matrix proportion have been investigated, the detail study of the hot erosion behavior being dependent on the spraying methods...
Boron carbide (B 4 C) is well known for its high hardness and wear resistance and has been used as a wear-resistant coating. If one of a pair of contact surfaces is coated by B 4 C, it may polish its mating surface and act as a run-in coating. Developing such run-in coatings demands a thorough understanding of the mating surface evolution in wear. This paper reports a study on the...
The fast Fourier transform (FFT) technology has been introduced into the process of contact analyses. However, a problem may occur at the borders of the domain due to a periodic error involved. In order to obtain reasonable results, an expedient treatment requires a computational physical domain much larger than the target domain at the cost of calculation efficiency. This paper studies the source...
The elevated temperature erosion resistance of one high-velocity oxygen-fuel (HVOF) chromium-titanium carbide cermet coating on mild steel was investigated in a laboratory blast nozzle-type erosion tester. Erosion tests were carried out at 300 and 450 o C, at particle velocities of 30 and 60 m/s and at impact angles of 30 o and 90 o , using bed ashes and fly ashes retrieved...
The erosivity of limestone, dolomite and coal samples retrieved from an operating boiler was determined in an elevated-temperature laboratory erosion tester. Test conditions attempted to simulate the erosion conditions found at the tubes in the bare tube-refractory interface area of CFBC boilers. Elevated-temperature erosion tests were conducted on AISI 1018 steel. Test results were compared to erosion...
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