High-cycle bending fatigue behavior of a high specific modulus κ-pearlitic steel
Source abstract
Abstract
This work investigated the high-cycle three-point bending fatigue behavior of a hot-rolled high specific Young's modulus (HSYM) κ-pearlitic steel and elucidated the microstructural mechanisms governing its fatigue resistance. Fatigue tests yielded a fatigue limit of approximately 461 MPa at 10 7 cycles, indicating superior cyclic strength compared with conventional pearlitic steels of equivalent hardness. Microstructural characterization revealed a refined κ-pearlitic structure. It consisted of ferrite, lamellar κ-carbides, and dispersed κ-carbide particles. Fatigue cracks preferentially initiated at ferrite/κ-carbide interfaces within pearlite colonies and propagated along the lamellar boundaries; and discrete κ-carbides promoted crack deflection and interfacial debonding during growth. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analyses confirmed significant strain localization and dislocation pile-ups near ferrite/κ-carbide interfaces, emphasizing their role in fatigue crack initiation and early growth. The combined effects of κ-carbides and refined pearlite endow HSYM steel with a high fatigue resistance, highlighting its potential for lightweight structural components.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Fatigue and fracture mechanics · Metal Forming Simulation Techniques · Microstructure and Mechanical Properties of Steels
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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