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Weldability of Ferritic Ductile Cast Iron Using Full Factorial Design of Experiment

Journal of Iron and Steel Research International 2014年第2期21卷 252-263页

作者： Mohsen Askari-Paykani mehrdad shayan Morteza Shamanian Department of Materials Engineering Isfahan University of Technology

The weldability of a ferritic ductile cast iron was investigated as a function of different consumables and welding conditions. A 23 full factorial experimental design was used to analyze the effect of factors and their interac- tions on ultimate tensile strength of weldments. The shielded metal arc welding （SMAW） process was used with two types of consumables （E7018 and ENi-CI） under eight different conditions using as-cast samples. The microstructur- al evolution and fracture mechanisms were investigated by optical microscopy and scanning electron microscopy （SEM）, respectively. The hardness, tensile and impact tests were also performed to determine the weld quality. Based on experiment design, preheat, consumable, cooling condition, preheat cooling and preheat-consumable inter- actions were significant factors. Preheat is the most effective factor and in the case of E7018, preheat and cooling conditions were the most sensible factors. It was found that buttering was the most appropriate welding method for ferritic ductile cast iron.

关键词： ferritic ductile cast iron shielded metal arc welding weldability full factorial experimental design

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Fabrication of AA2024−TiO2 nanocomposites through stir casting process

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Transactions of Nonferrous Metals Society of China 2020年第11期30卷 2891-2903页

作者： mehrdad shayan Beitallah EGHBALI Behzad NIROUMAND Department of Materials Science and Engineering Sahand University of TechnologyP.O.Box 51335-1996TabrizIran Department of Materials Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran

Given the nonuse of TiO2 nanoparticles as the reinforcement of AA2024 alloy in fabricating composites by ex-situ casting methods,it was decided to process the AA2024−xTiO2(np)(x=0,0.5 and 1 vol.%)nanocomposites by employing the stir casting *** structural properties of the produced samples were then investigated by optical microscopy and scanning electron microscopy;their mechanical properties were also addressed by hardness and tensile *** results showed that adding 1 vol.%TiO2 nanoparticles reduced the grain size and dendrite arm spacing by about 66%and 31%,***,hardness,ultimate tensile strength,yield strength,and elongation of AA2024−1vol.%TiO2(np)composite were increased by about 25%,28%,4%and 163%,respectively,as compared to those of the monolithic *** agglomerations of nanoparticles in the structure of nanocomposites were found to be a factor weakening the strength against the strengthening *** agglomerations of nanoparticles in the matrix were detected on the fractured surfaces of the tension test specimens.

关键词： AA2024−TiO2 nanocomposites mechanical properties microstructure fracture surface stir casting process

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