Friction and Wear Characteristics of Iron-chromium Alloys in Contact with Themselves and Silicon Carbide

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National Aeronautics and Space Administration, 1979 - Chromium-iron alloys - 20 pages
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An investigation was conducted to determine the effect of alloying elements on the friction and wear behavior of iron-chromium alloys with various concentrations of chromium alloyed in iron. Three sets of sliding friction experiments were conducted. In these experiments the alloys were in contact with: (1) themselves, (2) single-crystal silicon carbide disk surfaces, and (3) a single-crystal abrasive grit of silicon carbide. The first two sets of experiments were conducted in a vacuum chamber at a pressure of 10(exp -8) pascal to maximize adhesive wear effects. The third set of experiments was conducted in mineral oil at atmospheric pressure to maximize abrasive wear effects. All experiments were conducted with loads of 0.05 to 0.4 newton at a sliding velocity of 3 millimeters per minute with a total sliding distance of 2.5 millimeters at room temperature. The results of the investigation indicate that the coefficients of friction for the alloys sliding against themselves are between those for pure iron and pure chromium and are only slightly different with 1, 5, 9, 14, and 19 weight percent chromium in iron. The wear is due primarily to shearing, or tearing fracture, of the cohesive bonds in the bulk and plowing of the bulk by lumps of wear debris. There are only slight differences in coefficients of friction for iron-chromium alloys when sliding on silicon carbide. The coefficient of friction for the alloys are higher than those for pure iron and pure chromium. The alloy hardening observed in iron-chromium alloys plays a dominant role in controlling the abrasive friction and wear behavior of the alloys.

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