Versuche zur Bestimmung des makroskopischen Kriechanrisses. Unterscheidung der Versagensarten: RiBspitzenschadigung -Ligamentschadigung. Auswertung betriebsbeanspruchter GuBstucke mit Herstellungsfehlern. Vergleich der Bauteilbefunde mit den Laborergebnissen mit Hilfe der fiktiv elastischen Spannunqsintensitat K lid des Anfangsrisses und der Nennspannung an im Fernfeld des Risses. Zusammenhang ublicher Kriechdaten (R m t und Au) mit der Spannunqsintensitat K lid fur KriechriBeinleitung.Engineering aspects of creep crack initiation in view of application for components with manufacturing defects. Tests to determine the macroscopic creep crack initiation. Differing failure modes: crack tip damage -ligament damage. Evaluation of Service-Exposed Castings with manufacturing defects. Comparison of the findings on the castings and those of laboratory tests by means of the fictitious elastic initial stress intensity factor !
By following new paths in steel metallurgy the quality of heavy‐section components of 1% CrMoV steels, such as turbine rotors for fossil‐fired steam‐power plants, has been continuously improved. The objective of this paper is to study the influence of modern steel‐making processes on creep behaviour at 500 and 550°C using specimens taken from the rim and core zones of turbine rotors manufactured during the past ten years.
While an influence of the steel‐making process on creep‐rupture strength could not be established, the creep‐rupture strength and the creep strength for 1% creep strain were found on average to be 20% higher than the recommendations of SEW 555. In the VCD‐treated melts a creep strain of 1% was achieved earlier (time factor 2 to 3) than in melts treated otherwise.
Particularly the VCD‐treated melts are characterised by high creep ductility (reduction of area after creep rupture). But also the other melts were found to achieve a higher creep rupture ductility than in the past. This is mainly due to a lower content of residual elements as well as optimised heat treatment.
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