Einführung und Schrifttum. Gefügeuntersuchungen an vorbeanspruchten Stäben: Werkstoff und Probenvorbereitung; Gefüge nach Vorverformung ohne und mit nachfolgender Wechselbelastung; Gefügeänderungen unterschiedlich vorbeanspruchter Proben in Verbindung mit elektrochemischer Isolierung und röntgenographischer Prüfung der Rückstände; Gefügeänderungen und Anlaßbehandlung; Bereich der Gefügeänderungen im Verlauf der Wähler‐Linien. Röntgen‐Rückstrahlaufnahmen und Interferenzringschärfe: Kaltverformung und Anlaßbehandlung; Einfluß einer Wechselbelastung bei gestörtem und ungestörtem Kristallgitter; Röntgenbild und Trainieren von Stäben ohne und mit Gitterstörungen. Folgerungen und Deutungen.
Many tribosystems are subjected to different conditions with respect to temperature and humidity. Reciprocating sliding tests with steel/steel couples were performed using a laboratory test rig in air with varying relative humidity and temperature. During each test the friction force, the total linear wear, the electrical contact resistance, and the acoustic emission were recorded. Tests with self‐mated couples of bearing steel (100r6) and of stainless steel (X10CrNiMoNb18‐10/X5CrNi18‐9) in a ball‐on‐disc arrangement revealed small effects of temperature and humidity on friction, but a strong effect of the water vapour content on the wear rate of the system. Attempts were made to correlate changes of wear behaviour with different wear mechanisms.
PVD-coated tribosystems at reciprocating slidingThe aim of the investigation is to increase the life time of machinery elements of steel, sliding under high contact pressure, by PVD-coating of one of the surfaces. The three-step tribological testprogram includes a fundamental test, a model test under real conditions and a suitability test with real parts. The coefficient of friction and wear depends on substrate material, deposition variance, coating structure and surrounding conditions.Hard coatings: They enlarge the life time of lubricated systems considerably (p 5 OJ). Without lubrication the coefficient of friction is relatively high (p 2 0,5), which results in a short life time.Coatings with low friction: Soft metals and chalchogenides on supporting hard coatings only reduce the friction for a short time. Metal carbon coatings yield the lowest coefficient of friction (p = 0,2) and the greatest life time. In the range up to 1500 N/mm2 the pressure has a small influence on the life time. When the coated contact surface slides against an unmachined forged surface, the coating will be damaged after a short time due to local overload at asperities.
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