iron is through get spheroidal graphite spheroidization and inoculation, effectively improve the mechanical properties of cast iron, especially improve the plasticity and toughness, and the strength is higher than carbon steel.
So how to quickly identify spheroidization quality of ductile casting
1, the surface of the crust and the flame judgment method of rare earth magnesium nodular cast iron and magnesium content is low, and rare earth elements, liquid iron surface and pure magnesium nodular cast iron, the surface no enough scale, the flame is not so much.
But when adding a third iron liquid level can escape micron and white * * flame, like a candle flame.
According to the height of the flame quantity, judge the spheroidizing and residual amount of magnesium, the flame is higher, the more powerful, spheroidizing is good.
Especially when pouring, * * fire can be seen in the iron flow, such as height of 25 ~ ffice: smarttags"
50 mm, is spheroidizing is good;
If the flame is lower than 15 mm, the spheroidizing is poorer.
Of ductile iron
liquid iron from the surface, the formation of oxide film, rolling window and have a silvery white, is for the spheroidizing is good.
But said the iron oxide film is too thick, the liquid temperature is low.
2, triangle block method at present, through the observation to judge the spheroidizing block is a kind of widely used methods.
GeChang used block shape many, different size, most factories using triangle block.
According to my factory production characteristics, casting size and thickness, selection of triangular cross-section of block size of 12.
Also some plant adopts circular test piece, such as 15 mm, 25 mm, Ф Ф Ф 30 mm.
Iron liquid principle is finished with sampling spoon by 200 mm below the surface of the liquid iron is poured into a block and cold to the dark red Fang Keshui quenching cooling ball a good piece of cylindrical is much bigger than gray cast iron appearance clean palace are usually on both sides of the triangle block vertical casting sand have shrinkage in lie at the top of the block or both sides have a shrinkage in cooling type break block, spheroidizing good try, a silvery white or silver white porcelain fracture tip clear if have osteoporosis fracture with radial pattern is silver and the table ball agent addition amount on the high side of carbide block at this time more fashionable issue & other
Pat & throughout;
The embrittlement of the specimens is off and the tap new hit the mouth of a strong smell of calcium carbide so it's best casting for floating silicon) if an silver and a small black dot with uniform distribution.
3, pouring process judgment (
Ductile iron liquid poured into the mold, such as flood basin has been down concave shrinkage, and the surface is very smooth, show spheroidizing order;
Such as pouring basin knot a layer of crust and upper are concave, suggests that the low temperature of molten irons.
In the process of casting, sand mould surface has splash the circular flat iron beans of pitting,
That spheroidizing is good.
4, after the black border check ball handling, ladle pouring with sample block about a 10 mm thick, cool to dark red, quenching on patrol, such as found on the block surface has a dark side, said spheroidizing, and the thicker the black border, the spheroidizing, produce a recession, at this time, such as high temperature of iron liquid can be adding alloy.
Can see from the test block, such as around the block into a circular arc shape, and the middle sag, some wrinkles, also said spheroidizing good;
Such as block on the surface of wheat skin point, said iron melt oxidation, easy to recession.
In this case, the response to the stove.
5, observe the molten iron solidification condition after spheroidizing, take out a small amount of liquid iron, poured into the Ф 30 mm cylindrical metal type, observed during solidification of iron liquid poured out from the surface phenomenon, and according to the flow to judge the liquid iron spheroidization iron liquid quantity.
During spheroidizing good iron liquid and solid show a lot of graphite expansion force, at the beginning of the solidification of liquid iron surface some decline, after surface crust with a small amount of iron liquid by watchcase gushed out;
The spheroidizing bad gushed out small number of liquid iron surface.
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