Strategies to Reduce Porosity in Al-Mg WAAM Parts and Their Impact on Mechanical Properties
نویسندگان
چکیده
With the advent of disruptive additive manufacturing (AM), there is an increasing interest and demand high mechanical property aluminium parts built directly by these technologies. This has led to need for continuous improvement AM technologies processes obtain best properties in samples develop new alloys. study demonstrated that porosity can be reduced below 0.035% area Al-Mg manufactured CMT-based WAAM with commercial filler metal wires selecting correct shielding gas, gas flow rate, deposition strategy (hatching or circling). Three phase Ar+O2+N2O mixtures (Stargold®) are favourable when hatching applied leading wall thickness around 6 mm. The application circling (torch movement overlapped circles along welding direction) enables even build-up layers slightly thicker (8 mm). In this case, Ar effectively reduce if proper provided through torch. Reduced flows (lower than 30 Lmin) enhance porosity, especially long tracks (longer 90 mm) due local heat accumulation. Surprisingly, rather levels (up 2.86 %) obtained worst conditions, had a impact on static tensile test properties, yield stress over 110 MPa, strength 270 elongation larger 27% were achieved either circling, hatching, Stargold® building conditions. all cases anisotropy was lower 11%, 9% most appropriate Current results show selected layer height parameters complete re-melting previous thermal treatment prior bottom refined grain size removing original dendritic elongated structure. Under minimum reported achieved.
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کتاب در باب ترجمه، اثر استر آلن و سوزان برنوفسکی منتشر شده در ماه می 2013 توسط نشریه کلمبیا است. نویسندگان در این کتاب به بررسی 18 مترجم با در نظر گرفتن نقش آثاری که این مترجمان ترجمه کرده اند میپردازند. کتاب به دو بخش تقسیم میشود: " مترجم در جهان" و " کار مترجم" این دو بخش مقالات همیشگی ترجمه و موقعیت خاص ادبیات بیگانه در جهان وسیع امروزی را مورد خطاب قرار میدهد. در این کتاب مقالات متعددی از ن...
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ژورنال
عنوان ژورنال: Metals
سال: 2021
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met11030524