Fatigue behavior of an Fe48Cr15Mo14Er2C15B6 amorphous steel

Autor: S. J. Poon, Peter K. Liaw, Gongyao Wang, Gary J. Shiflet, V. Ponnambalam, D. C. Qiao
Rok vydání: 2007
Předmět:
Zdroj: Journal of Materials Research. 22:544-550
ISSN: 2044-5326
0884-2914
Popis: Four-point-bend fatigue experiments were conducted on the Fe48Cr15Mo14Er2C15B6 bulk metallic glass (BMG), amorphous steel, under load control, employing an electrohydraulic machine, at a frequency of 10 Hz (using a sinusoidal waveform) with an R ratio of 0.1, where R = σmin./σmax. (σmin. and σmax. are the applied minimum and maximum stresses, respectively). The test environment was laboratory air. Fe48Cr15Mo14Er2C15B6 exhibited a high fatigue-endurance limit (682 MPa), which is found to be greater than those of the Zr-based BMG, Al-alloy, and high-nitrogen steel. However, the stress versus number of fatigue cycles curve of Fe48Cr15Mo14Er2C15B6 has a significantly brittle fracture mode. Some fatigue cracks initiated from the inclusions or porosities, and the fatigue-crack propagation region was large. However, other cracks initiated from the outer tensile surface of the specimen, and the fatigue-crack propagation region was very small. The mechanisms of fatigue-crack initiation are suggested.
Databáze: OpenAIRE
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