The tensile test shall be carried out in accordance with gb/t 228-2002 tensile test method for metallic materials at room temperature, and the sample shall be a standard short cylindrical sample; The impact test shall be conducted according to GB 229-2007 metallic materials Charpy pendulum impact test method, and...
The cooling curves of typical flake graphite cast iron and nodular cast iron are shown in the figure. It can be seen from the figure that under the condition of the same casting section size and carbon silicon content, the undercooling required to generate flake graphite cast iron is...
As cast crankshaft castings with nodular cast iron trademark of QT800-2 are selected as the samples. After testing, the nodularity grade is grade 2, the graphite size is grade 5~6, and the chemical composition is shown in Table. Element C Si Mn P S Content 3.78-3.99 1.83-2.26 0.46-0.50 0.05-0.06...
On the premise of good spheroidization of graphite, the mechanical properties of nodular cast iron can be adjusted in a large range by means of heat treatment. After isothermal quenching, nodular cast iron can obtain high strength, high toughness, high hardness and high bending fatigue strength at the same...
There are two traditional solutions to the shrinkage defects of lost foam casting nodular iron castings. One is to set a riser at the hot spot to provide the liquid metal that needs to be compensated due to the volume change in the forming process of lost foam casting...
The inclusion of reducer housing is related to the process characteristics of lost foam casting nodular cast iron, which can not be completely eliminated. Only process means can be used to solve the inclusion defect. According to the inclusion of lost foam casting nodular cast iron reducer housing and...
The carbon content of ductile iron castings in lost foam casting is generally 3.5% ~ 3.8%, which is easy to produce carbon defect inclusions. Considering the gas evolution and carbon content, the copolymer is selected for the white mold of lost foam casting nodular cast iron. The copolymer balances...
When nodular cast iron is cast, the amount of nodularizing agent will directly affect the graphite morphology in cast iron, the comprehensive properties of nodular cast iron and the production cost. Therefore, since the appearance of nodular cast iron, the amount of nodulizing agent has been one of the...
Lost foam casting nodular cast iron has the advantages of good surface quality, high dimensional accuracy and high process yield. It is applied to the production of nodular cast iron. The reducer shell is required to have high strength, toughness, wear resistance and seismic performance, and the material is...
By controlling the size and distribution of graphite diameter and the spherical regularity of graphite, the correlation degree with the macro mechanical properties of nodular cast iron is established. From the above results, in QT-CWM spheroidizing process, the spheroidizing agent of the sample is evenly distributed and has high...