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Influence of Al-Si coating on microstructure and mechanical properties of fiber laser welded 22MnB5 steel
摘要： Fiber laser welding of as-received 22MnB5 steel with Al-10wt.%Si coating in butt configuration was performed. The influence of Al-Si coating on microstructure transformation and mechanical properties including tensile tests, fatigue tests and Erichsen cupping tests was investigated. Ferrite with Al enrichment (1.37 wt%) was found in the fusion zone (FZ) of coated welded joints with 15% area proportion, while nearly entire martensite structure composed the FZ in the case of de-coated joint. The strain localization was more likely to accumulate at the martensite/martensite interface rather than the ferrite/martensite interface due to the higher kernel average misorientation (KAM) values. Microhardness of the FZ in coated welded joints dropped by 50HV compared with that of de-coated welded joints. However, tensile properties were not affected since failure occurred at base metal (BM). Fatigue samples of coated welded joints showed better performance than the de-coated ones, suggesting that the ferrite in the FZ had positive effect on fatigue lives under cycling load conditions. The Erichsen cupping tests showed similar Erichsen values (5.60 mm and 5.67 mm) for de-coated and coated welded joints. An opposite effect of ferrite on Erichsen cupping tests was obtained. The peak force required for deformation dropped by 35% with Al-10wt.%Si coating.
关键词： Microstructure,Al-Si coating,Mechanical properties,Fiber laser welding,22MnB5 steel
更新于2025-11-28 14:24:20
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[Laser Institute of America ICALEO?? 2015: 34th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing - Atlanta, Georgia, USA (October 18a??22, 2015)] International Congress on Applications of Lasers & Electro-Optics - Preliminary laser welding tests of 22MnB5 steel with a butt joint and lap joint configurations
摘要： In recent years, the automotive industry has expanded the use of hot stamping and press hardening processes. Using ultra-high-strength steels, such as 22MnB5, allows car manufacturers to build lighter, stronger and safer vehicles at a reduced cost and generate lower CO2 emissions. In the research the laser weldability of 22MnB5 steel was tested. The test plates were produced using a constant heating temperature of 900°C and a variable furnace time of between 250 and 600 seconds. The samples were quenched in a water-cooled flat die to ensure a fully martensitic structure and good flatness. The welding tests were made using a 10 kW disk laser equipped with the optics of Precitec. Various welding energies were used to determine the effects of heating and cooling on the mechanical properties of the welds. The weld inspections conformed to ISO standard 13919-1 and automotive testing code SEP 1220-3 (Testing and documentation guideline for the joinability of thin sheet of steel - Part 3: Laser beam welding) where applicable. The radiographic inspection showed some porosity and a lack of penetration on both the face and root side of almost every weld. Despite these serious imperfections, the destructive tests were performed and showed relatively good results. The maximum achieved yield strength was over 1200 MPa, reaching almost the strength of the base material 22MnB5. The maximum value of hardness in the laser welds of 22MnB5 steel was 500 HV; the same as the hardness of the base material. However, a relatively narrow softened zone exists in the HAZ area, which has a hardness value of 200 HV.
关键词： press hardening,ultra-high-strength steels,22MnB5 steel,automotive industry,laser welding
更新于2025-09-23 15:19:57