Effect of Cobalt Additions on the Microstructure and Mechanical Properties of As-Cast Thin-Wall Ductile Iron

2020 ◽  
Author(s):  
Alejandra Almanza ◽  
Dale Dewald ◽  
Joseph Licavoli ◽  
Paul G. Sanders
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
Thin Wall ◽  
Microstructure And Mechanical Properties

The Effect of Vertical Step Block Casting to Microstructure and Mechanical Properties in Producing Thin Wall Ductile Iron

2013 ◽  
Vol 789 ◽  
pp. 387-393 ◽  
Author(s):  
Rianti Dewi Sulamet-Ariobimo ◽  
Johny Wahyuadi Soedarsono ◽  
Is Prima Nanda
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
Plate Thickness ◽  
Thin Wall ◽  
Microstructure And Mechanical Properties ◽  
Casting Yield ◽  
Automotive Parts ◽  
Vertical Step ◽  
Casting Design ◽  
Filling And Solidification

Thin wall ductile iron (TWDI) is introduced to fulfill the needs of lighter material in automotive parts that will reduce fuel consumption. Problem occurs during the production of TWDI due to the casting thickness. TWDI casting thickness classified to below 5 mm. Many designs have been made to answer the problem in producing thin wall ductile iron. Soedarsono et al established vertical step block casting design. This design based on Y-block principle that allows direct pouring of liquid metal to the mold without passing any gating system. This design will increase casting yield. The parameter of this research is pouring basin placement to study the effect of plate arrangement to filling and solidification. This research is conducted to see the effect of pouring basin placement to microstructure and mechanical properties of TWDI. The Design is made to produce 5 plates with different thickness that is 1, 2, 3, 4, and 5 mm. All of the plates arranged parallel in line. Pouring basin located in 2 ways. The first type located pouring basin above the plate of 5 mm thickness while the second one located it above the plate with 1 mm thickness. The first type coded as T4 while the second coded as T5. The moulds made from furan sand. The result shows although cold shut occurred in both pouring basin placements due to pouring discontinuity but shrinkage only formed in T5 on its plate with 1 mm thickness. Microstructure of all the plates presented nodule graphite in pearlite matrix. Carbide and skin effects also detected. Average nodularity is above 80% while the nodule count is between 614 to 1269 nodule/mm2. Most of the Brinell hardness number exceeded maximum limit given by JIS G5502 but the UTS is below the minimum limit except for 3 mm plate thickness of T5. All elongation values below the minimum standard. The results confirm that pouring basin location is important in casting design following Y-Block principle.

Microstructure and Mechanical Properties of a Wear-Resistant As-Cast Alloyed Bainite Ductile Iron

2014 ◽  
Vol 27 (3) ◽  
pp. 476-482 ◽  
Author(s):  
Junjun Cui ◽  
Hongyun Zhang ◽  
Liqing Chen ◽  
Haizhi Li ◽  
Weiping Tong
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
Wear Resistant ◽  
Microstructure And Mechanical Properties

scholarly journals The Microstructure and Mechanical Properties of Poplar Catkin Fibers Evaluated by Atomic Force Microscope (AFM) and Nanoindentation

Forests ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 938 ◽  
Author(s):  
Wu ◽  
Wu ◽  
Shi ◽  
Chen ◽  
Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Cell Structure ◽  
Large Cell ◽  
Populus Tomentosa ◽  
Thin Wall ◽  
Cell Lumen ◽  
Atomic Force ◽  
Microstructure And Mechanical Properties ◽  
Wall Cell

In this study, the microstructure and mechanical properties of poplar (Populus tomentosa) catkin fibers (PCFs) were investigated using field emission scanning electron microscope, atomic force microscopy (AFM), X-ray diffraction, and nanoindentation methods. Experimental results indicated that PCFs had a thin-wall cell structure with a large cell lumen and the hollow part of the cell wall took up 80 percent of the whole cell wall. The average diameters of the fiber and cell lumen, and the cell wall thickness were 5.2, 4.2, and 0.5 µm, respectively. The crystallinity of fibers was 32%. The AFM images showed that the orientation of microfibrils in cell walls was irregular and their average diameters were almost between 20.6–20.8 nm after being treated with 2 and 5 wt.% potassium hydroxide (KOH), respectively. According to the test of nanoindentation, the average longitudinal-reduced elastic modulus of the PCF S2 layer was 5.28 GPa and the hardness was 0.25 GPa.

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