Figure (a) shows the overall metallographic structure (after heat treatment) of ztap / HCCI composite under optical microscope. The microstructure of the composite can be divided into HCCI matrix sintered in the composite zone and HCCI matrix formed by casting ztap and columnar zone. In the figure, the light...
30cr13 martensitic stainless steel has good mechanical properties, hardenability and corrosion resistance, which is widely used in medical devices, measuring instruments and molds. The low temperature toughness and strength of 30cr13 steel can be significantly improved by the dispersion precipitation of carbon and nitride (size less than 5 nm)...
The macro morphology of the preform is shown in figure (a). After sintering, ztap is fully wrapped by HCCI to form a honeycomb structure. The diameter of the middle through-hole is 20 mm, which can increase the contact area between molten iron and the preform during the casting process,...
The nominal composition of the experimental alloy is shown in Table 1. The raw materials are: al-24.45% Si master alloy, pure Al (99.8%), pure Fe (99.9%), pure Ni (99.99%), pure Cu (99.99%) and pure Mg (99.9%). The alloy was melted at 800 ℃ and degassed in argon atmosphere for...
1.Selection and properties of preform materials The mass fraction of ZrO2 in ztap is 40wt%, the particle size is 1 ~ 2mm, and some physical / mechanical properties are obtained. The particle size of the high chromium alloy powder is 50 ~ 100 μ m, and the chemical composition...
(1) The results show that the Fe rich phase in al-17si-1fe alloy contains only long needle like β phase when the extrusion force is 0, while the al-17si-2fe alloy contains not only acicular β phase but also lath like δ phase. With the increase of extrusion force, the length...
The slag holes are mainly distributed around 2 and 5 turns, accounting for 22.7%; the defect area is large and in pieces. After dissecting the gating system, it was found that many fiber filters used for hot metal filtration were deformed and broken (Fig. 1), which had no effect...
Hypereutectic Al Si alloys have been widely used in the manufacture of automotive engine piston, cylinder block and other parts because of their high specific strength, good heat resistance and wear resistance. With the improvement of automobile engine power, the high-temperature strength and heat resistance of traditional cast aluminum...
The generation of cold shut is directly affected by the temperature of molten iron. At a certain temperature, the design of gating system is the key to the filling capacity of molten iron. Through simulation and analysis, it is found that the original runner design of gating system is...
High chromium white cast iron or high manganese steel is usually used to cast wear-resistant parts such as grinding roller, grinding disc and plate hammer used in thermal power generation, mining and cement industries. Due to the wear of coal mine and sand, the working environment is bad, which...