Low-cycle fatigue behavior of fiber-laser welded, corrosion-resistant, high-strength low alloy sheet steel
| Autor: | Matthew J. Connolly, Stephanie L. Miller, Jeffrey W. Sowards, Erik A. Pfeif, Brian J. Simonds, Joseph D. McColskey, James R. Fekete |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Cyclic stress
Heat-affected zone Materials science Butt welding 02 engineering and technology Welding engineering.material law.invention 0203 mechanical engineering law Residual stress lcsh:TA401-492 General Materials Science Composite material Stress concentration High-strength low-alloy steel Mechanical Engineering Metallurgy technology industry and agriculture Laser beam welding respiratory system 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports Mechanics of Materials engineering lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Materials & Design, Vol 121, Iss, Pp 393-405 (2017) |
| ISSN: | 0264-1275 |
| Popis: | Advanced laser welding techniques such as fiber laser welding are desirable for joining high-strength steels in ground vehicle applications since they can greatly increase productivity. Weld fatigue is a primary design consideration for implementation of laser-welded sheet into ground vehicle structures. However, much of the previous fatigue work on fiber laser welded sheet steel has utilized stress-controlled fatigue testing. Therefore, this paper presents an optimized fiber laser welding procedure for butt welds of high-strength low-alloy steel sheet, and subsequent fully-reversed, strain-controlled low-cycle fatigue testing on weld material. Existing low cycle fatigue models adequately describe fatigue behavior of the laser welds. The results show that weld low cycle fatigue strength is significantly increased relative to base metal due to formation of martensite in the weld caused by rapid cooling inherent to laser welding. Weld fatigue life was shorter than base metal when plastic strains were high, but was close to base metal at lower plastic strains. Fatigue specimens containing weld failed at both base metal and in the weld indicating that there is some competition between weld cyclic fatigue strength and stress concentration effect at the weld fusion zone. Keywords: Fiber laser beam welding, High strength low alloy steel, Low cycle fatigue, Microstructure-property relationships, Residual stress, Sheet steel |
| Databáze: | OpenAIRE |
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