Laser-induced toughening inhibits cut-edge failure in multi-phase steel
| Autor: | Chaowei Du, Cemal Cem Tasan, Johan P.M. Hoefnagels |
|---|---|
| Přispěvatelé: | Mechanics of Materials, Group Hoefnagels |
| Rok vydání: | 2020 |
| Předmět: |
Toughness
Materials science Laser cutting 02 engineering and technology Edge (geometry) 01 natural sciences Blanking 0103 physical sciences Cut-edge failure General Materials Science Surface layer Composite material 010302 applied physics Mechanical Engineering Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Mechanics of Materials Micromechanics Deformation (engineering) 0210 nano-technology In-situ testing Layer (electronics) |
| Zdroj: | Scripta Materialia, 177, 79-85. Elsevier |
| ISSN: | 1359-6462 |
| Popis: | The as-cut microstructures and the subsequent microstructural deformation characteristics of dual-phase steel specimens were analyzed using in-situ biaxial Marciniak tests, microscopic digital-image-correlation and nano-indentation, for two industrially relevant cutting processes: laser cutting and blanking. Interestingly, the strain-to-failure of the former is almost twice that of the latter, even though microstructural damage initiates twice as early (at 8% strain) in the ∼60 µm-thick, fully-martensitic surface layer of the laser-cut affected zone. However, its ∼145 µm-thick, tempered-martensite sub-surface layer provides the toughness to delay micro-damage propagation, arrest the crack growth, and ultimately provide the high strain-to-failure. These observations reveal guidelines to avoid cut-edge failure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect