Fusion defects-induced enhancement of fatigue life at elevated temperature of CoCrFeNiMo0.5 alloy produced by laser-powder bed fusion
Source abstract
Abstract
The inherent porosity in additive manufacturing is typically classified as fusion-related defects, and the low cycle fatigue (LCF) life of most metallic materials diminishes with increasing temperature. Notably, the CoCrFeNiMo 0.5 alloy containing fusion defects exhibited an anomalously enhanced LCF life at elevated temperatures compared to ambient conditions. Utilizing a custom-designed mechanical-thermal coupling fatigue testing apparatus, we conducted LCF assessments of the CoCrFeNiMo 0.5 alloy across a temperature spectrum from 20 o C to 600 o C. Specimens fabricated with three different laser power settings demonstrated increased fatigue life at 200 o C, with the specimen processed at 165 W laser power showing a 65.6% improvement in LCF life at 200 o C relative to room temperature. Microstructural analysis across multiple scales revealed that porosity acts as a stress dissipation mechanism, mitigating localized stress concentrations, thereby retarding crack initiation and propagation, and ultimately extending fatigue life.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · High Entropy Alloys Studies · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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