The Heat Treatment of The Investment Cast
    For the second type of heat treatment and advocate, al qaeda has had the obvious change, can be roughly divided into five categories:1, softening annealing: its purpose is to decompose the carbide, its hardness is reduced, and improve the pr...

The Heat Treatment of Precision Castings
    Because different aims of precision casting, heat treatment, basic can be mainly divided into two categories, the first category is the organization structure will not change or by heat treatment and should not be changed, the second is the...

Casting Surface Defect Detection Method o
    Eddy current testing is suitable for inspection are rarely more than 6 ~ 7 mm deep beneath the surface defects. Eddy current testing points to place coil method and through the coil method two. : when the specimen is placed near the coil of...

Casting Penetration Testing of Surface De
    Liquid penetrant testing is used to check the various open defect of casting surface, such as surface crack, such as pinhole on the surface of the defects of the naked eye is hard to find. Commonly used penetrant testing is shading detection...

Casting Surface Defect Detection Method o
    Magnetic particle testing is suitable for testing surface defect and number of mm deep beneath the surface defect, it needs a dc or ac magnetization equipment and magnetic powder can (or magnetic suspension) testing operation. Magnetization...

The Role of Rare Earth In Nodular Cast Ir
    Since the 1960 s of the study showed that the inoculants containing cerium can keep the liquid iron in the midterm increase the count, the final group contains more chilling tendency of graphite ball and smaller. The research also suggests t...

Grey Cast Iron Production and Performance
    Cast iron is more than 2.1% of the iron carbon carbon alloy, it is to cast iron (partial steelmaking pig iron) (cupola and electric furnace to melt in the furnace, and adding ferroalloys (such as ferrosilicon inoculant) the components, scrap...

Repair The Type of Investment Casting Met
    In the process of precision casting, whether small or large parts of machine structure, the modelling of what we do must be in to repair the type of parts after the draw, there are various methods of type, today we have four kinds of method...

The Matters for Attention For Ductile Cas
    Ductile castings in production, which should be followed when pouring temperature, the principle of low temperature pouring. For improve the melt temperature of liquid metal to completely melt inclusions, slag buoyancy, convenience of slag r...

Optimization of Ductile Casting Quality C
    In order to ensure ductile casting quality, in production must pay attention to the following questions:1 ladle, casting tools, furnace pretreatment with inoculant, nodulizing agent before use must be fully dry, dry before use.2 pouring pers...

The Role of Nickel Element In Gray Cast I
    The role of Ni (Ni) elements in cast iron:1. Miscible with liquid iron and ferrite2. During the eutectic promote graphitization, its effect is equivalent to a third si3. Reduce the austenite transformation temperature, expand the austenite z...

The Role of Trace Elements In Grey Cast I
    The role of copper, tin, antimony, in cast iron:Cu (copper)1. Dissolved in the austenite limit of 3.5% (when the carbon is 3.5%)2. Promote the graphitization eutectic phase, ability of about 1/5 of the silicon3. Reduce the austenite transfor...